CN210668207U - Remote gas density relay system - Google Patents
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Abstract
The application discloses teletransmission gas density relay system includes: the background monitoring terminal is used for realizing remote communication with at least one gas density monitoring device through communication equipment to complete online monitoring and verification of the gas density relay; the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a temperature adjusting mechanism, an online check contact signal sampling unit and a circuit control part; backstage monitor terminal or monitoring devices control intelligent processor and control temperature adjustment mechanism, and then adjust the temperature lift of gas density relay's temperature compensation component, make gas density relay take place the contact action, and gas density value when intelligent processor acted according to the contact detects out contact signal action value and/or return value, need not maintainer and just can accomplish the remote check-up of gas density relay to the scene, can realize non-maintaining simultaneously, has improved the reliable safe operation of benefit and electric wire netting greatly.
Description
Technical Field
The utility model relates to an electric power tech field especially relates to an use teletransmission gas density relay system on high pressure, middling pressure electrical equipment.
Background
The gas density relay is generally used for monitoring and controlling the density of insulating gas in high-voltage electrical equipment, a contact signal control loop is arranged in the gas density relay, a gas path of the gas density relay is communicated with a gas chamber of the high-voltage electrical equipment, when gas leakage is detected, a contact of the gas density relay acts to generate a contact signal, and the contact signal control loop gives an alarm or locks according to the contact signal, so that the safe operation protection of the electrical equipment is realized.
At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF2The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture can form condensed water, so that the surface insulation strength of the insulation part is obviously reduced, and even flashover is caused, thereby causing serious harm. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.
With the development of the unattended transformer substation towards networking and digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring method has important practical significance on the gas density and micro-water content state of SF6 electrical equipment. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation.
The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment. The 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and simultaneously realizes the wireless remote transmission function of the gas density, thereby completing the regular checking work of the (mechanical) gas density relay without the need of maintainers to arrive at the site, greatly improving the working efficiency and reducing the cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a teletransmission gas density relay system to solve the problem that proposes in the above-mentioned technical background.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a remote gas density relay system comprising:
the background monitoring terminal is in remote communication with at least one gas density monitoring device through the communication equipment;
the communication equipment is used for realizing data transmission of the background monitoring terminal and the gas density monitoring device;
the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a temperature adjusting mechanism, an online checking contact signal sampling unit and a circuit control part; wherein,
the temperature adjusting mechanism is an adjustable temperature adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay so as to enable the gas density relay to generate contact action;
a gas density detection sensor including at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or, a density detection sensor adopting quartz tuning fork technology; the gas density detection sensor is communicated with the gas density relay;
the online check contact signal sampling unit is directly or indirectly connected with the gas density relay and is configured to sample a contact signal generated by contact action of the gas density relay, wherein the contact signal comprises an alarm and/or a lock;
the circuit control part comprises a power supply and an intelligent processor for supplying power to each electric device; the intelligent processor is respectively connected with the gas density detection sensor, the temperature adjusting mechanism, the online checking contact signal sampling unit and the communication equipment, is configured to be direct or receive the remote control instruction of the background monitoring terminal, completes the control of the temperature adjusting mechanism, the collection of pressure values and temperature values and/or the collection of gas density values, detects the contact signal action values and/or contact signal return values of the gas density relay, and sends test data and/or checking results to the background monitoring terminal through the communication equipment in real time.
Preferably, the background monitoring terminal includes a storage device for storing data and/or information transmitted to the background monitoring terminal through the communication device.
Preferably, the background monitoring terminal comprises a display interface for human-computer interaction, displays the current verification data in real time, and/or supports data input. Specifically, the method comprises real-time online gas density value display, pressure value display, temperature value display, change trend analysis, historical data query, real-time alarm and the like.
Preferably, the communication device is arranged at a housing of the gas density relay, or at a housing of the circuit control part, or the communication device and the intelligent processor are of an integrated structure.
Preferably, the communication mode of the communication device is a wired communication mode or a wireless communication mode.
More preferably, the wired communication mode includes, but is not limited to, one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a PLC power carrier, and a cable line.
More preferably, the wireless communication mode includes, but is not limited to, one or more of a 5G/NB-IOT communication module (e.g., 5G, NB-IOT), a 2G/3G/4G/5G, WIFI, bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar.
Preferably, the gas density relay includes, but is not limited to, a bimetal compensated gas density relay, a gas compensated gas density relay, a bimetal and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
Preferably, the gas density relay comprises: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a signal generator, wherein the base, the pressure detector, the temperature compensation element and the signal generator are arranged in the shell; the gas density relay outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
More preferably, at least one temperature sensor is arranged near or on or integrated in a temperature compensation element of the gas density relay. Preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay close to the temperature compensation element.
Further, a leading-out wire sealing piece is arranged in the shell of the gas density relay, and the connecting wire of the temperature sensor is connected with the intelligent processor through the leading-out wire sealing piece.
More preferably, the gas density relay further comprises a heat insulator provided between a housing of the gas density relay and a housing of the circuit control section; alternatively, the thermal insulation is disposed at the power source.
More preferably, the housing of the gas density relay is filled with a shock-proof liquid.
More preferably, the power source is located remotely from the temperature sensor and the temperature compensation element, wherein the remote is: under the normal working state, the power supply generates heat and does not influence the temperature sensor and the temperature compensation element.
More preferably, the gas density relay outputs a contact signal through the signal generator.
More preferably, the gas density relay further comprises a display mechanism, wherein the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; alternatively, the display mechanism comprises a digital device or a liquid crystal device with a display.
Preferably, the gas density detection sensor is provided on the gas density relay; or the temperature adjusting mechanism is arranged inside or outside the gas density relay; or the gas density detection sensor, the online check contact signal sampling unit and the intelligent processor are arranged on the gas density relay.
More preferably, the gas density relay and the gas density detection sensor are of an integrated structure; or the gas density relay and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
Preferably, the gas density detection sensor is of an integrated structure; or, the gas density detection sensor is a gas density transmitter with an integrated structure.
More preferably, the online check joint signal sampling unit and the intelligent processor are arranged on the gas density transmitter.
Preferably, the probe of the pressure sensor is mounted on the gas path of the gas density relay.
Preferably, the pressure sensor is disposed in a housing of the gas density relay, or in a housing of the circuit control unit, or in the pressure adjustment mechanism, or in the valve.
Preferably, the probe of the temperature sensor is mounted on or outside the gas path of the gas density relay, or inside the housing of the gas density relay, or outside the housing of the gas density relay.
Preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple.
Preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor, and/or an absolute pressure sensor.
More preferably, when the pressure sensor is an absolute pressure sensor, the pressure sensor is represented by an absolute pressure value, the verification result is a corresponding absolute pressure value of 20 ℃, and is represented by a relative pressure value, and the verification result is converted into a corresponding relative pressure value of 20 ℃;
when the pressure sensor is a relative pressure sensor, the relative pressure value is used for representing, the verification result is the corresponding relative pressure value at 20 ℃, the absolute pressure value is used for representing, and the verification result is converted into the corresponding absolute pressure value at 20 ℃;
the conversion relation between the absolute pressure value and the relative pressure value is as follows:
Pabsolute pressure＝PRelative pressure+PStandard atmospheric pressure。
More preferably, the pressure sensor may also be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure sensor with an induction coil in the bawden tube), a resistive pressure sensor (e.g., a pressure sensor with a slide wire resistor in the bawden tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.
Preferably, the temperature adjustment mechanism is a heating element; or the temperature regulating mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature regulating mechanism shell; alternatively, the temperature adjustment mechanism comprises a heating element and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature adjusting mechanism comprises a heating element, a controller and a temperature detector; or, the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or the temperature adjusting mechanism is a micro constant temperature box; the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors; the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.
More preferably, the heating element in the temperature regulating mechanism is composed of at least two heating elements with the same or different powers; or consists of a heating element with adjustable heating power.
More preferably, the arrangement positions of the at least two heating elements can be the same or different, and can be reasonably arranged according to needs.
Preferably, the temperature adjusting mechanism is controlled in a multi-stage temperature increasing and decreasing manner.
Preferably, the temperature regulating mechanism is controlled by the intelligent processor, when measuring the contact signal action value of the gas density relay, the temperature change speed is not more than 1.0 ℃ per second when approaching the action value (or the requirement is set according to the requirement), namely the temperature requirement is steadily increased or decreased.
Preferably, the intelligent gas density relay further comprises a mutual self-calibration unit, and the intelligent processor realizes maintenance-free of the gas density relay by comparing data detected by the mutual self-calibration unit; or the detected data are compared through the intelligent processor and the mutual self-correcting unit, so that the maintenance-free gas density relay is realized.
Preferably, the intelligent processor further comprises a depth calculating unit, and the depth calculating unit can provide an air source with proper initial density for the gas density relay to be verified according to the ambient temperature value, the gas density value or the pressure value of the electrical equipment and the gas pressure-temperature characteristic; or the intelligent processor can provide an air source with proper initial density for the gas density relay to be checked according to the environment temperature value during checking, the gas pressure value of the gas chamber of the electrical equipment and the temperature value to be checked of the gas density relay and the gas pressure-temperature characteristic.
Preferably, the remote gas density monitoring device system further comprises: and one end of the valve is provided with a connecting port communicated with the electrical equipment, and the other end of the valve is communicated with the gas path of the gas density relay.
More preferably, the valve is also connected with the intelligent processor, and the valve is closed or opened under the control of the intelligent processor.
More preferably, the valve communicates with the electrical device directly or through a connection fitting.
More preferably, the valve is an electric valve, and/or a solenoid valve.
Further, the valve is a permanent magnet type electromagnetic valve.
More preferably, the valve is a piezoelectric valve, or a temperature control valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
More preferably, the valve is closed or opened in a hose bending or flattening mode.
More preferably, the valve is sealed within a chamber or housing.
More preferably, pressure sensors are respectively arranged on two sides of the air path of the valve; or, the two sides of the air passage of the valve are respectively provided with a pressure or density detector.
More preferably, the remote gas density monitoring device system further comprises a self-sealing valve, wherein the self-sealing valve is arranged between the electrical equipment and the valve; alternatively, the valve is mounted between an electrical device and the self-sealing valve.
Preferably, the remote gas density monitoring device system further comprises: the gas path of the pressure regulating mechanism is communicated with the gas path of the gas density relay; the pressure regulating mechanism is also connected with the intelligent processor, and is used for regulating the pressure rise and fall of the gas density relay under the control of the intelligent processor so as to be matched with or/and combined with the temperature regulating mechanism to enable the gas density relay to generate contact action; or,
further comprising: the intelligent processor is connected with the heating device; or,
the intelligent gas density relay is characterized by further comprising an air chamber and a heating device, the air chamber is communicated with a gas path of the gas density relay, the heating device is arranged outside or inside the air chamber, and the intelligent processor is connected with the heating device.
More preferably, the pressure regulating mechanism is sealed within a chamber or housing.
More preferably, the valve and the pressure regulating mechanism are sealed within a single chamber or housing.
More preferably, during verification, the pressure adjusting mechanism is a closed gas chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed gas chamber, and the temperature of the gas in the closed gas chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased.
Further, the heating element, and/or the cooling element is a semiconductor.
Further, the pressure regulating mechanism further comprises a heat preservation piece, and the heat preservation piece is arranged outside the closed air chamber.
More preferably, during verification, the pressure adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with the gas path of the gas density relay; the cavity is internally provided with a piston, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod and then drives the piston to move in the cavity.
More preferably, during verification, the pressure adjusting mechanism is a closed air chamber, a piston is arranged inside the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving component is arranged outside the closed air chamber, and the driving component pushes the piston to move in the cavity through electromagnetic force.
More preferably, the pressure adjustment mechanism is an air bag having one end connected to a driving member, the air bag is driven by the driving member to generate a volume change, and the air bag is communicated with the gas density relay.
More preferably, the pressure adjusting mechanism is a bellows, one end of the bellows is communicated with the gas density relay, and the other end of the bellows extends and contracts under the driving of the driving part.
The driving component of the pressure adjusting mechanism includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepping motor), a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.
More preferably, the pressure regulating mechanism is a purge valve.
Further, the pressure regulating mechanism further comprises a flow valve for controlling the gas release flow.
Further, the air release valve is an electromagnetic valve or an electric valve, or other air release valves realized by electric or pneumatic means.
Further, the bleed valve is with gaseous zero-bit, intelligent control treater gathers the pressure value at that time, compares, accomplishes the zero-bit check to pressure sensor, and intelligent processor or backstage monitoring terminal judge the result of comparison, if the error is out of tolerance, send unusual suggestion: pressure sensors have problems.
More preferably, the pressure regulating mechanism is a compressor.
More preferably, the pressure regulating mechanism is a pump, and the pump includes, but is not limited to, one of a pressurizing pump, an electric air pump, and an electromagnetic air pump.
The pressure regulating mechanism can slowly increase or decrease the load when the gas density relay is subjected to pressure increase or pressure reduction; when measuring the contact signal action value of the gas density relay, the load change speed is not more than 10 per second of the measuring range when approaching the action value, namely the pressure can be adjusted (can be steadily increased or decreased).
In a preferred embodiment, the gas density relay, the valve, and the pressure adjusting mechanism are connected together by a connecting pipe.
More preferably, the gas path of the pressure regulating mechanism is communicated with the gas path of the gas density relay through a first connecting pipe; the gas outlet of the valve is directly communicated with the gas circuit of the gas density relay through a second connecting pipe, or the gas outlet of the valve is connected with the gas circuit of the pressure regulating mechanism through a second connecting pipe, so that the valve is communicated with the gas circuit of the gas density relay.
In a preferred embodiment, the gas density relay further comprises a multi-way joint, the gas density relay is arranged on the multi-way joint, and/or the valve is arranged on the multi-way joint, and/or the pressure regulating mechanism is arranged on the multi-way joint; and/or the intelligent processor is arranged on the multi-way connector.
More preferably, the gas path of the gas density relay is connected with a first joint of the multi-way joint; the gas path of the pressure regulating mechanism is connected with a second joint of the multi-way joint, and the first joint is communicated with the second joint so as to communicate the gas path of the pressure regulating mechanism with the gas path of the gas density relay; and the gas outlet of the valve is communicated with a third joint of the multi-way joint, and the third joint is communicated with the first joint, so that the gas outlet of the valve is communicated with the gas circuit of the pressure regulating mechanism and/or the gas circuit of the gas density relay.
Furthermore, the third joint of the multi-way joint is provided with a connecting part butted with electrical equipment, and the valve is embedded in the connecting part.
Preferably, the online check joint signal sampling unit and the intelligent processor are arranged together.
More preferably, the online verification junction signal sampling unit and the intelligent processor are sealed in a cavity or a shell.
Preferably, the online verification contact signal sampling unit samples the contact signal of the gas density relay, and the sampling conditions are as follows:
the online check joint signal sampling unit is provided with at least one group of independent sampling joints, can automatically complete check on at least one joint simultaneously, and continuously measures without changing the joint or reselecting the joint; wherein,
the contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.
Preferably, the online verification contact signal sampling unit is used for testing the contact signal action value of the gas density relay or the switching value of the contact signal action value not lower than 24V, namely, during verification, a voltage not lower than 24V is applied between corresponding terminals of the contact signal.
Preferably, the contact of the gas density relay is a normally open density relay, the online verification contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay and a contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay and the intelligent processor; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the online checking contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit and connects the contact of the gas density relay with the intelligent processor; or,
the contact of the gas density relay is a normally closed density relay, the online check contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay and a contact signal control circuit, and the second connecting circuit is connected with the contact of the gas density relay and the intelligent processor; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; under the check-up state, online check-up contact signal sampling unit closes contact signal control circuit cuts off the connection of gas density relay's contact and contact signal control circuit, the intercommunication the second connecting circuit, will gas density relay's contact with intelligent processor is connected.
More preferably, the first connection circuit comprises a first relay, the second connection circuit comprises a second relay, the first relay is provided with at least one normally closed contact, the second relay is provided with at least one normally open contact, and the normally closed contact and the normally open contact maintain opposite switch states; the normally closed contact is connected in series in the contact signal control loop, and the normally open contact is connected to the contact of the gas density relay;
in a non-checking state, the normally closed contact is closed, the normally open contact is opened, and the gas density relay monitors the output state of the contact in real time; under the check-up state, normally closed contact disconnection, normally open contact is closed, the contact of gas density relay passes through normally open contact with intelligent treater is connected. For a density relay with normally closed contacts, the adjustment can be made accordingly.
Further, the first relay and the second relay may be two independent relays or may be the same relay.
More preferably, the online checking contact signal sampling unit is provided with a contact sampling circuit, the contact sampling circuit comprises a photoelectric coupler and a resistor, and the photoelectric coupler comprises a light emitting diode and a phototriode; the light emitting diode and the contact of the gas density relay are connected in series to form a closed loop; the emitting electrode of the phototriode is grounded; the collector of the phototriode is connected with the intelligent processor, and the collector of the phototriode is also connected with a power supply through the resistor;
when the contact is closed, the closed loop is electrified, the light-emitting diode emits light, the phototriode is conducted by the light, and the collector of the phototriode outputs a low level;
when the contact is opened, the closed loop is opened, the light emitting diode does not emit light, the phototriode is cut off, and the collector of the phototriode outputs high level.
More preferably, the online verification contact signal sampling unit is provided with a contact sampling circuit, and the contact sampling circuit comprises a first photoelectric coupler and a second photoelectric coupler;
the light emitting diode of the first photoelectric coupler and the light emitting diode of the second photoelectric coupler are respectively connected in parallel or directly connected in parallel through a current limiting resistor, and are connected in series with the contact of the gas density relay after being connected in parallel to form a closed loop, and the connection directions of the light emitting diodes of the first photoelectric coupler and the second photoelectric coupler are opposite;
the collector of the phototriode of the first photoelectric coupler and the collector of the phototriode of the second photoelectric coupler are both connected with a power supply through a divider resistor, the emitter of the phototriode of the first photoelectric coupler is connected with the emitter of the phototriode of the second photoelectric coupler to form an output end, and the output end is connected with the intelligent processor and is grounded through a resistor;
when the contact is closed, a closed loop is electrified, the first photoelectric coupler is conducted, the second photoelectric coupler is cut off, and the emitter of the phototriode of the first photoelectric coupler outputs high level; or the first photoelectric coupler is cut off, the second photoelectric coupler is conducted, and an emitter of a phototriode of the second photoelectric coupler outputs a high level;
when the contact is disconnected, the closed loop is powered off, the first photoelectric coupler and the second photoelectric coupler are both cut off, and the emitters of the phototriodes of the first photoelectric coupler and the second photoelectric coupler output low levels.
Furthermore, the contact sampling circuit further comprises a first voltage stabilizing diode group and a second voltage stabilizing diode group, the first voltage stabilizing diode group and the second voltage stabilizing diode group are connected in parallel on the contact signal control loop, and the connection directions of the first voltage stabilizing diode group and the second voltage stabilizing diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are respectively formed by connecting one, two or more than two voltage stabilizing diodes in series. Alternatively, a diode may be used instead of the zener diode.
Still further, the first zener diode group comprises a first zener diode and a second zener diode which are connected in series, and a cathode of the first zener diode is connected to an anode of the second zener diode; the second voltage stabilizing diode group comprises a third voltage stabilizing diode and a fourth voltage stabilizing diode which are connected in series, and the anode of the third voltage stabilizing diode is connected with the cathode of the fourth voltage stabilizing diode.
More preferably, the online checking contact signal sampling unit is provided with a contact sampling circuit, the contact sampling circuit comprises a first hall current sensor and a second hall current sensor, contacts of the first hall current sensor, the second hall current sensor and the gas density relay are connected in series to form a closed loop, and a contact of the gas density relay is connected between the first hall current sensor and the second hall current sensor; the output end of the first Hall current sensor and the output end of the second Hall current sensor are both connected with the intelligent processor;
when the contact is closed, a closed loop is electrified, and current flows between the first Hall current sensor and the second Hall current sensor to generate induced potential;
when the contact is opened, the closed loop is powered off, no current flows between the first Hall current sensor and the second Hall current sensor, and the generated induced potential is zero.
More preferably, the online verification contact signal sampling unit is provided with a contact sampling circuit, and the contact sampling circuit includes: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;
first silicon controlled rectifier, third silicon controlled rectifier establish ties, and the series connection circuit that second silicon controlled rectifier, fourth silicon controlled rectifier establish ties the back and first silicon controlled rectifier, third silicon controlled rectifier constitute forms the series-parallel closed circuit, the one end of gas density relay's contact pass through the circuit with circuit electricity between first silicon controlled rectifier, the third silicon controlled rectifier is connected, the other end pass through the circuit with circuit electricity between second silicon controlled rectifier, the fourth silicon controlled rectifier is connected.
Furthermore, the cathode of the first controllable silicon is connected with the intelligent processor, and the anode of the first controllable silicon is connected with the cathode of the third controllable silicon; the control electrodes of the first controllable silicon and the third controllable silicon are connected with the intelligent processor; the cathode of the second controllable silicon is connected with an intelligent processor, and
the anode of the second controllable silicon is connected with the cathode of the fourth controllable silicon; and control electrodes of the second controllable silicon and the fourth controllable silicon are connected with the intelligent processor.
Preferably, the intelligent processor acquires the gas density value acquired by the gas density detection sensor; or the intelligent processor acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the online monitoring of the gas density by the gas density monitoring device, namely the online monitoring of the gas density of the monitored electrical equipment by the gas density monitoring device.
More preferably, the intelligent processor calculates the gas density value using an averaging method (averaging method) that is: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in the whole temperature range to obtain a gas density value; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in the whole pressure variation range to obtain a gas density value; wherein N is a positive integer greater than or equal to 1.
Preferably, the intelligent processor acquires a gas density value acquired by the gas density detection sensor when the gas density relay generates contact signal action or switching, and completes online verification of the gas density relay; or,
the intelligent processor obtains a pressure value and a temperature value acquired by the gas density detection sensor when the gas density relay generates contact signal action or switching, and converts the pressure value and the temperature value into a corresponding pressure value of 20 ℃ according to gas pressure-temperature characteristics, namely a gas density value, so as to complete the online verification of the gas density relay.
Preferably, the intelligent processor automatically controls the whole verification process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic, input and output.
More preferably, the intelligent processor automatically controls the whole verification process based on embedded algorithms and control programs of a general-purpose computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC, etc., an industrial control main board, an embedded main control board, etc., and includes all peripherals, logics, and input and output.
Preferably, the intelligent processor is provided with an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or input of analog quantity and digital quantity information.
More preferably, the gas density relay (or the gas density monitoring device) supports the input of basic information of the gas density relay, wherein the basic information comprises one or more of, but is not limited to, a factory number, a precision requirement, a rated parameter, a manufacturing plant and an operation position.
More preferably, the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged by the misconnection of a user and/or preventing electromagnetic interference.
Preferably, a clock is further arranged on the intelligent processor, and the clock is configured to be used for regularly setting the verification time of the gas density relay, or recording the test time, or recording the event time.
Preferably, the control of the intelligent processor is controlled by field control and/or the background monitoring terminal.
More preferably, the intelligent processor completes the online verification of the gas density relay according to the setting of the background monitoring terminal or a remote control instruction; or, completing the online verification of the gas density relay according to the set verification time of the gas density relay.
Preferably, the circuit of the intelligent processor comprises an intelligent processor protection circuit, and the intelligent processor protection circuit comprises, but is not limited to, one or more of an anti-electrostatic interference circuit (such as ESD, EMI), an anti-surge circuit, an electric fast protection circuit, an anti-radio frequency field interference circuit, an anti-pulse group interference circuit, a power supply short circuit protection circuit, a power supply connection reverse protection circuit, an electric contact misconnection protection circuit, and a charging protection circuit.
Preferably, the power supply comprises a power supply circuit, or a battery, or a recyclable battery, or solar energy, or a power supply obtained by electricity getting from a transformer, or an induction power supply.
Preferably, the remote gas density relay system further comprises a shielding piece capable of shielding an electric field and/or a magnetic field, and the shielding piece is arranged in or outside the shell of the circuit control part; or the shielding part is arranged on the intelligent processor and/or the communication equipment; or,
the shield is disposed on the pressure sensor.
The shielding piece utilizes the reflection and/or absorption of the shielding material to reduce EMI radiation, and the addition of the shielding material can effectively reduce or eliminate unnecessary gaps, inhibit electromagnetic coupling radiation and reduce electromagnetic leakage and interference; the electromagnetic shielding material (such as iron) can be made of a material with high electric conduction and magnetic conduction performance, the shielding performance is generally required to be 40-60 dB, specifically, the circuit control part is sealed in a shell made of the shielding material, the sealing is good, and the problem of interference caused by electromagnetic leakage due to the discontinuous electric conduction of gaps can be solved.
Preferably, the intelligent processor compares the environmental temperature value with the temperature value acquired by the temperature sensor to complete the calibration of the temperature sensor.
Preferably, the gas density relay is provided with a comparison density value output signal which is connected with the intelligent processor; or the gas density relay is provided with a comparison pressure value output signal which is connected with the intelligent processor.
More preferably, when the gas density relay outputs an output signal of the comparison density value, the intelligent processor collects the current gas density value, performs comparison, completes the comparison density value verification of the gas density relay, and the intelligent processor or/and the background monitoring terminal judges the comparison result, and sends an abnormal prompt if the error is out of tolerance; or,
when the gas density relay outputs a comparison density value output signal, the intelligent processor acquires the current gas density value, compares the gas density value with the current gas density value, completes mutual verification of the gas density relay and the gas density detection sensor, judges a comparison result by the intelligent processor or/and the background monitoring terminal, and sends an abnormal prompt if the error is out of tolerance; or,
when the gas density relay outputs a comparison pressure value output signal, the intelligent processor collects the current pressure value, the comparison is carried out, mutual verification of the gas density relay and the gas density detection sensor is completed, the intelligent processor or/and the background monitoring terminal judges the comparison result, and if the error is out of tolerance, an abnormal prompt is sent.
Preferably, a remote gas density relay system of the present application comprises at least two gas density detection sensors, each comprising a pressure sensor, a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.
Preferably, the gas density detection sensor comprises at least two pressure sensors, and the pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.
Preferably, the gas density detection sensor comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.
Preferably, the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; randomly arranging and combining the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors, converting the combinations into a plurality of corresponding pressure values at 20 ℃ according to gas pressure-temperature characteristics, namely gas density values, and comparing the gas density values to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors are subjected to all permutation and combination, and each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristic, namely gas density values, and each gas density value is compared to complete the mutual verification of each pressure sensor and each temperature sensor; or comparing a plurality of gas density values obtained by each pressure sensor and each temperature sensor with comparison density value output signals output by the gas density relay to complete mutual verification of the gas density relay, each pressure sensor and each temperature sensor; or comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.
Preferably, after the gas density relay is verified, the intelligent processor automatically generates a verification report of the gas density relay, and if the gas density relay is abnormal, the intelligent processor sends an alarm and uploads the alarm to a remote end or sends the alarm to a designated receiver.
Preferably, the gas density relay further comprises a gas supply interface.
More preferably, the air supply interface is arranged on the pressure regulating mechanism; or the air supply interface is arranged on the electrical equipment; or the air supply interface is arranged on the multi-way joint; or the air supply interface is arranged on the self-sealing valve.
More preferably, the remote gas density relay system can count the gas supplementing times, or the gas supplementing amount, or the gas supplementing time.
Preferably, the remote gas density relay system can perform online gas supplement.
Preferably, the remote gas density relay system can be subjected to online gas drying.
Preferably, the remote gas density relay system further comprises: and the micro water sensor is used for monitoring the gas micro water value on line and is respectively connected with the gas density relay and the intelligent processor.
More preferably, the remote gas density relay system further comprises: the gas circulation mechanism is respectively connected with the gas density relay and the intelligent processor, and comprises a capillary tube, a sealing chamber and a heating element, the gas circulation mechanism realizes gas flow by heating the heating element, and the micro water value in the gas is monitored on line.
Further, the micro water sensor can be installed in a sealed chamber of the gas circulation mechanism, in a capillary, at a capillary port, and outside the capillary.
Preferably, the remote gas density relay system further comprises: and the decomposition product sensor is used for monitoring gas decomposition products on line and is respectively connected with the gas density relay and the intelligent processor.
Preferably, the gas density relay further comprises a contact resistance detection unit; the contact resistance detection unit is connected with the contact or directly connected with a signal generator in the gas density relay; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the gas density relay acts and/or receives an instruction of detecting the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.
Preferably, the remote gas density relay system further comprises a camera for monitoring.
Preferably, the remote gas density relay system monitors the gas density value on line, or the density value, the pressure value and the temperature value; or the remote transmission gas density relay system remotely transmits and monitors the gas density value, or the density value, the pressure value and the temperature value.
Preferably, the remote gas density relay system has a self-diagnosis function, and can notify abnormality in time. Such as a broken wire, a short alarm, a broken sensor, a tendency for gas pressure to rise, etc.
Preferably, the remote gas density relay system has a safety protection function: when the gas density value or the pressure value is lower than the set value, the verification is automatically not carried out, and an informing signal is sent out.
Preferably, the remote gas density relay system is provided with a heater and/or a heat sink (e.g., a fan), the heater being turned on when the temperature is below a set value and the heat sink (e.g., a fan) being turned on when the temperature is above the set value.
Preferably, when the gas density relay generates a signal connection action, the remote gas density relay system detects, or detects and determines, a contact resistance of a contact point of the gas density relay. Specifically, a contact resistance measuring circuit is added on the gas density relay, and the measurement is carried out by adopting a bridge method or a voltage and current method.
Preferably, the remote gas density relay system further comprises an insulating member, and the pressure sensor is connected with the pressure sensor fixing seat through the insulating member, or the pressure sensor is hermetically fixed on the pressure sensor fixing seat through the insulating member.
Preferably, the remote gas density relay system further comprises an analysis system (for example, an expert management analysis system) for detecting, analyzing and judging the gas density value monitoring, the electrical performance of the gas density relay and the monitoring element.
Preferably, at least two gas density monitoring devices are connected with the background monitoring terminal sequentially through a concentrator and a protocol converter; wherein, each gas density relay is respectively arranged on the gas chamber of the corresponding electrical equipment.
More preferably, the hub is an RS485 hub.
More preferably, the protocol converter adopts an IEC61850 or IEC104 protocol converter.
More preferably, the protocol converter is further connected to a network service printer and a network data router, respectively.
Preferably, at least two gas density relays, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online checking contact signal sampling units, an intelligent processor and a gas density detection sensor are used for completing online checking of the gas density relays; or,
the online checking system comprises at least two gas density relays, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online checking contact signal sampling units, at least two intelligent processors and a gas density detection sensor, and is used for completing online checking of the gas density relays; or,
the on-line checking system comprises at least two gas density relays, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, at least two gas density detection sensors and an intelligent processor, and is used for completing the on-line checking of the gas density relays.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has: the application provides a remote transmission gas density relay system which is used for high-voltage and medium-voltage electrical equipment and comprises a background monitoring terminal, wherein remote control is realized through communication equipment and at least one gas density monitoring device, and online monitoring and verification of a gas density relay are completed; the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a temperature adjusting mechanism, an online checking contact signal sampling unit and a circuit control part, wherein the circuit control part comprises a power supply and an intelligent processor. The temperature of a temperature compensation element of the gas density relay is adjusted through the temperature adjusting mechanism to enable the gas density relay to generate contact action, the contact action is transmitted to the intelligent processor through the online check contact signal sampling unit, and the intelligent processor detects an alarm and/or locking contact signal action value and/or return value of the gas density relay according to the gas density value during contact action. This application can not install the check-up valve of density relay additional, also can just realize the check-up to gas density relay without dismantling, need not the maintainer and just can accomplish gas density relay's long-range check-up work to the scene, has improved the reliability of electric wire netting, has improved efficiency, and the cost is reduced can realize the non-maintaining to gas density relay simultaneously.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic structural view of a gas density relay according to a first embodiment;
FIG. 2 is a schematic structural diagram of a gas density monitoring apparatus according to the first embodiment;
FIG. 3 is a schematic diagram of a control circuit of the gas density monitoring apparatus according to the first embodiment;
FIG. 4 is a schematic structural view of a gas density monitoring apparatus according to a second embodiment;
FIG. 5 is a schematic structural view of a gas density monitoring apparatus according to a third embodiment;
FIG. 6 is a schematic structural view of a gas density monitoring apparatus according to a fourth embodiment;
FIG. 7 is a schematic structural view of a gas density monitoring apparatus according to a fifth embodiment;
FIG. 8 is a schematic structural view of a gas density monitoring apparatus according to the sixth embodiment;
FIG. 9 is a schematic view of a control circuit of a gas density monitoring apparatus according to a seventh embodiment;
FIG. 10 is a schematic view of a control circuit of a gas density monitoring apparatus according to an eighth embodiment;
FIG. 11 is a schematic view of a control circuit of a gas density monitoring apparatus according to the ninth embodiment;
FIG. 12 is a schematic view of a control circuit of a gas density monitoring apparatus according to an exemplary embodiment;
FIG. 13 is a schematic diagram of a 4-20mA type density transmitter circuit on a gas density relay;
fig. 14 is a schematic diagram of a remote gas density relay system according to a twelfth embodiment;
fig. 15 is a schematic diagram of a remote gas density relay system according to the thirteenth embodiment;
fig. 16 is a schematic diagram of a remote gas density relay system according to the fourteenth embodiment.
Detailed Description
The utility model provides a teletransmission gas density relay system, for making the utility model discloses a purpose, technical scheme and effect are clearer, clear and definite, and it is right that the following reference is made to the figure and the example is lifted the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The first embodiment is as follows:
fig. 1 is a schematic view of a gas density relay. As shown in fig. 1, the gas density relay 1 includes: the temperature control device comprises a shell 101, and a base 102, an end seat 108, a pressure detector 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, a dial 107, a pressure sensor 2, a temperature sensor 3, a temperature adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 71 which are arranged in the shell 101. The valve 4 and the pressure regulating mechanism 11 are provided on a joint 1010 outside the housing 101 (or on a multi-way joint outside the housing 101). One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, the other end of the temperature compensation element 104 is provided with a beam, and the beam is provided with an adjusting piece which pushes the signal generator 109 and enables a contact of the signal generator 109 to be switched on or off. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the core 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The gas density relay 1 may also comprise a digital device with a display or a liquid crystal device.
Fig. 2 is a schematic diagram of a gas density relay or gas density monitoring device. As shown in fig. 2, the gas density relay or the gas density monitoring apparatus includes: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a temperature adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent processor 7 and a pressure adjusting mechanism 11. The pressure sensor 2, the temperature sensor 3, the temperature adjusting mechanism 5, the online checking contact signal sampling unit 6 and the intelligent processor 7 are arranged on the gas density relay 1. The valve 4 and the pressure regulating mechanism 11 are provided on a joint 1010 outside the housing 101 (or on a multi-way joint outside the housing 101).
Specifically, the air inlet of the valve 4 is provided with an interface communicated with electrical equipment, the air inlet of the valve is hermetically connected to the electrical equipment and communicated with an air chamber of the electrical equipment, and the air outlet of the valve 4 is communicated with the gas density relay 1 and the pressure adjusting mechanism 11; the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path; the temperature sensor 3 is disposed in the vicinity of the temperature compensation element 104 of the gas density relay 1. The temperature adjustment mechanism 5 is provided on the density relay 1. The pressure adjusting mechanism 11 is communicated with the gas density relay 1; the online check contact signal sampling unit 6 is respectively connected with the gas density relay 1 and the intelligent processor 7; the valve 4, the pressure sensor 2, the temperature sensor 3, the temperature adjusting mechanism 5 and the pressure adjusting mechanism 11 are respectively connected with the intelligent processor 7.
Fig. 3 is a schematic diagram of a control circuit of a gas density relay or gas density monitoring device. As shown in fig. 3, the online verification contact signal sampling unit 6 of this embodiment is provided with a protection circuit, which includes a first connection circuit and a second connection circuit, the first connection circuit connects the contact of the gas density relay 1 and the contact signal control circuit, the second connection circuit connects the contact of the gas density relay 1 and the intelligent processor 7, in a non-verification state, the second connection circuit is disconnected, and the first connection circuit is closed; in the checking state, the online checking contact signal sampling unit 6 cuts off the first connecting circuit, communicates the second connecting circuit and connects the contact of the gas density relay 1 with the intelligent processor 7.
Specifically, the first connection circuit includes a first relay J1, and the second connection circuit includes a second relay J2. The first relay J1 is provided with normally closed contacts J11 and J12, and the normally closed contacts J11 and J12 are connected in series in the contact signal control circuit; the second relay J2 is provided with normally open contacts J21 and J22, and the normally open contacts J21 and J22 are connected at a contact P of the gas density relay 1JThe above step (1); the first relay J1 and the second relay J2 may be integrated into a single unit, i.e., a relay having normally open and normally closed contacts. In a non-verification state, the normally closed contacts J11 and J12 are closed, and the normally open contact J21 and J22 are disconnected, and a gas density relay monitors the joint P in real timeJThe output state of (1); in the verification state, the normally closed contacts J11 and J12 are opened, the normally open contacts J21 and J22 are closed, and the contact P of the gas density relay 1 is closedJAnd the intelligent processor 7 is connected with the normally open contacts J21 and J22.
The intelligent processor 7 mainly comprises a processor 71(U1) and a power supply 72 (U2). The processor 71(U1) may be a general-purpose computer, an industrial personal computer, a CPU, a single chip microcomputer, an ARM chip, an AI chip, an MCU, an FPGA, a PLC, etc., an industrial control motherboard, an embedded main control board, etc., and other intelligent integrated circuits. The power source 72(U2) may be a switching power supply, ac 220V, dc power supply, LDO, programmable power supply, solar, battery, rechargeable battery, or the like. The pressure sensor 2 of the pressure acquisition P may be: pressure sensors, pressure transmitters, and the like. The temperature sensor 3 of the temperature acquisition T may be: various temperature sensing elements such as temperature sensors and temperature transmitters. The valve 4 may be: solenoid valves, electric valves, pneumatic valves, ball valves, needle valves, regulating valves, shut-off valves, etc. can open and close the gas circuit and even the elements controlling the flow. Semi-automatic may also be a manual valve. The temperature adjusting mechanism 5 is a heating element; or the temperature regulating mechanism mainly comprises a heating element, a heat preservation piece, a controller, a temperature detector, a temperature regulating mechanism shell and the like; or the temperature adjusting mechanism mainly comprises a heating element and a temperature controller; the controller includes, but is not limited to, one of a PID controller, a PID and fuzzy controller combined controller, a variable frequency controller, and a PLC controller. The pressure adjusting mechanism 11 may be: electric regulating piston, electric regulating cylinder, booster pump, gas cylinder pressurization, valve, electromagnetic valve and flow controller. Semi-automatic pressure adjustment mechanisms that can also be adjusted manually.
The working principle of the first embodiment is as follows:
the intelligent processor 7 monitors the gas pressure P and the temperature T of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain the corresponding 20 ℃ pressure value P20(i.e., gas density value). When the gas density relay needs to be checkedAt 1, if the gas density value P is at this time20Not less than set safety check density value PSAnd the intelligent processor 7 controls the valve 4 to be closed, so that the gas density relay 1 is isolated from the electrical equipment on the gas path. Then, the intelligent processor 7 controls to open the contact signal control loop of the gas density relay 1, that is, the normally closed contacts J11 and J12 of the first relay J1 of the online check contact signal sampling unit 6 are opened, so that the safe operation of the electrical equipment is not influenced when the gas density relay 1 is checked online, and an alarm signal is not mistakenly sent or the control loop is locked when the gas density relay is checked. Since the gas density value P is already carried out before the start of the calibration20Not less than set safety check density value PSThe gas of the electrical equipment is in a safe operation range, and the gas leakage is a slow process and is safe during verification. Meanwhile, the intelligent processor 7 is communicated with a contact sampling circuit of the contact of the gas density relay 1, namely normally open contacts J21 and J22 of a second relay J2 of the on-line verification contact signal sampling unit 6 are closed, and at the moment, a contact P of the gas density relay 1 is closedJIt is connected to the smart processor 7 through the normally open contacts J21 and J22 of the second relay J2.
Then, the intelligent processor 7 closes the valve 4 between the gas density relay 1 and the electrical equipment; the intelligent processor 7 drives the pressure adjusting mechanism 11 to slowly reduce the pressure of the gas density relay, and after the pressure is reduced to a target pressure value, the operation can be stopped. Then, the temperature of the gas density relay 1 is increased by the operation or control of the temperature adjusting mechanism 5 by the intelligent processor 7, and the temperature of the temperature compensation element of the gas density relay is increased, so that the gas density relay 1 generates the contact action, the contact action is uploaded to the intelligent processor 7 through the second relay J2 of the on-line checking contact signal sampling unit 6, the intelligent processor 7 converts the pressure value P and the temperature value T measured when the contact is acted into the pressure value P20 (density value) corresponding to 20 ℃ according to the gas characteristic, and the contact action value P of the gas density relay can be detectedD20. For example, the parameter is 0.6/0.52/0.50MPa (rated value is 0.6 MPa/alarm pressure value) for the density relay0.52 MPa/alarm pressure value 0.50MPa, relative pressure), when ambient temperature is 5 ℃, drive pressure adjustment mechanism 11 through intelligent processor 7, make the pressure of gas density relay slowly drop, the gas pressure that drops to density relay is 0.5562MPa (relative pressure), in the check-up system this moment, the pressure value is unchangeable, when the temperature rises to 29.5 ℃, its warning contact takes place the action, intelligent processor 7 just can obtain gas density relay warning contact action value 0.5317MPa (relative pressure) according to pressure value 0.5562MPa (relative pressure) when the contact acts, temperature value 29.5 ℃, intelligent processor 7 just can obtain the error of warning contact action value: and 0.0117MPa (0.5317MPa-0.52 MPa is 0.0117MPa), and the checking of the alarm contact action value of the density relay is completed.
In this way, the contact action is transmitted to the intelligent processor 7 through the online checking contact signal sampling unit 6, the intelligent processor 7 obtains the gas density value according to the pressure value and the temperature value when the contact acts, or directly obtains the gas density value, detects the contact signal action value of the gas density relay, and completes the checking work of the contact signal action value of the gas density relay. The intelligent processor 7 also comprises a depth calculation unit, which is able to calculate the depth from the ambient temperature value, the electrical equipment gas density value or the pressure value.
Through the operation or control of intelligent processor 7 to temperature regulation mechanism 5, make the temperature of gas density relay 1 reduce, and then the temperature reduction of gas density relay's temperature compensation component, make gas density relay take place the contact and reset, the contact resets and transmits intelligent processor 7 through online check contact signal sampling unit 6, intelligent processor 7 obtains gas density value according to the pressure value when the contact resets, the temperature value, or directly obtains gas density value, detect out the contact signal return value of gas density relay, accomplish the check-up work of gas density relay's contact signal return value. For example, for the gas density relay with the density relay parameter of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the ambient temperature is 5 ℃, the gas pressure in the electrical equipment 8 is 0.5562MPa (relative pressure), and also in the verification system, the pressure value is unchanged, when the temperature is reduced to 24.8 ℃, the alarm contact is reset, the intelligent processor 7 can obtain the return value 0.5435MPa (relative pressure) of the alarm contact of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 24.8 ℃ when the contact is reset, and the intelligent processor 7 can obtain the switching difference of the alarm contact: and 0.0118MPa (0.5435-0.5317 MPa is 0.0118MPa), so that the action value of the alarm contact of the density relay is verified. The intelligent processor 7 can determine the performance condition (such as pass or fail) of the gas density relay to be verified according to the verification result (verification data) according to the requirement.
When all the contact signal verification operations are completed, the heating element 501 of the temperature adjustment mechanism 5 is turned off by the manual or intelligent processor 7. Simultaneously opening the valve 4. After all the contact signal checking work is finished, the heating element of the temperature adjusting mechanism is turned off through the intelligent processor 7, the online checking contact signal sampling unit 6 is adjusted to be in a working state, the control loop of the contact signal of the gas density relay recovers to be in a normal working state, and the valve 4 is opened. In this embodiment, the operation sequence of the temperature adjusting mechanism and the pressure adjusting mechanism can be flexible, that is, the pressure adjusting mechanism can be operated first, and then the temperature adjusting mechanism can be operated; or the temperature adjusting mechanism can be operated firstly, and then the pressure adjusting mechanism can be operated; or the pressure adjustment mechanism and the temperature adjustment mechanism may be operated simultaneously. The verification is repeated for multiple times (for example, 2 to 3 times), and then the average value of the verification is calculated, so that the verification work of the gas density relay is completed.
After the verification is finished, the normally open contacts J21 and J22 of the second relay J2 of the online verification contact signal sampling unit 6 are disconnected, and the contact P of the gas density relay 1 is disconnected at the momentJThe smart processor 7 is disconnected by opening the contacts of the second relay J2 to normally open J21 and J22. The intelligent processor 7 turns off the heating element of the temperature adjusting mechanism, and the intelligent processor 7 controls the valve 4 to be opened, so that the gas density relay 1 is communicated with the electrical equipment on a gas path. Then, the normally closed contacts J11 and J1 of the first relay J1 of the on-line verification contact signal sampling unit 6J12 is closed, the contact signal control loop of the gas density relay 1 works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Therefore, the online checking work of the gas density relay is conveniently completed, and the safe operation of the electrical equipment is not influenced.
After the gas density relay 1 completes the calibration work, the gas density relay or the gas density monitoring device system makes a judgment and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) the gas density relay system may be annunciated locally, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or uploading is implemented through an online remote transmission communication mode, for example, the data can be uploaded to a background monitoring terminal; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In short, after the gas density relay system completes the online verification work of the gas density relay 1, if an abnormality occurs, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the verification work is completed, if the verification work is abnormal, the intelligent processor 7 can upload the alarm contact signals of the gas density relay 1 to a remote end (a monitoring room, a background monitoring platform and the like) and can display the notice on site. Simple version on-line verification can upload the result of abnormal verification through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with an alarm signal contact and is regularly closed and opened, and the condition can be obtained through analysis; or through a separate verification signal line. Specifically, the state can be uploaded well, or the state can be uploaded in a problem manner, or the verification result can be uploaded through a single verification signal line, or the verification result can be uploaded through local display, local alarm or wireless uploading and can be uploaded through the network with the smart phone. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the gas density relay system can be fully ensured in multiple modes and various combinations.
The gas density relay system has a safety protection function, namely when the gas density relay system is lower than a set value, the gas density relay system automatically does not perform online verification on the gas density relay 1 any more, and sends out a notification signal. For example, when it is detected that the gas density value is less than the set value PSThen, checking is not performed; only when the gas density value is more than or equal to (alarm pressure value +0.02MPa), the online verification can be carried out.
The gas density relay system can perform online verification according to set time, and can also perform online verification according to set temperature (such as extreme high temperature, extreme low temperature, normal temperature, 20 degrees). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 level. The method can be implemented according to the relevant standard according to the temperature requirement. For example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code, the accuracy requirement corresponding to each temperature value is met.
The gas density relay system can compare the error performance of the gas density relay 1 at different temperatures and different time periods. That is, the performances of the gas density relay 1 and the electric device are judged by comparing the temperatures in the same temperature range at different times, and the comparison between the history and the present time is made.
The electrical equipment can be repeatedly verified for a plurality of times (for example, 2 to 3 times), and the average value of the verification results is calculated according to each time. When necessary, the gas density relay 1 can be checked online at any time.
Wherein, gas density relay 1 includes: a bimetallic strip compensated gas density relay, a gas compensated gas density relay, or a bimetallic strip and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; a density relay with indication (a density relay displayed by a pointer, a density relay displayed by a digital code, a density relay displayed by a liquid crystal) and a density relay without indication (namely a density switch); SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relays.
Type of pressure sensor 2: absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, may be several in number. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).
The temperature sensor 3 may be: a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like. The valve 4 can be controlled by various transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic hydraulic, electrohydraulic, pneumatic hydraulic, spur gear and bevel gear drive; the valve can be operated according to the preset requirement under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can make the opening and closing piece perform lifting, sliding, swinging or rotating motion by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve can be changed to realize the control function of the valve. The valve 4 can be driven by automatic valves, power-driven valves and manual valves. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric motor (motor) drive. The valve 4 may be automatic or manual, semi-automatic. The verification process can be automatically completed or semi-automatically completed through manual cooperation. The valve 4 is connected directly or indirectly, integrally or separately, to the electrical equipment through a self-sealing valve, a manual valve, or a non-detachable valve. The valve 4 may be normally open or normally closed, or may be unidirectional or bidirectional, as desired. In short, the air passage is opened or closed through the electric control valve. The electric control valve can adopt the following modes: electromagnetic valve, electric control ball valve, electric control proportional valve, etc. The temperature adjusting mechanism 5 is a heating element; or the temperature regulating mechanism mainly comprises a heating element, a heat preservation piece, a controller, a temperature detector, a temperature regulating mechanism shell and the like; or the temperature adjusting mechanism mainly comprises a heating element and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power adjuster and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a controller, a temperature detector and the like; or, the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or the temperature adjusting mechanism is a micro constant temperature box; the heating element comprises but is not limited to a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor; the heating element consists of a plurality of heating element groups; the controller includes, but is not limited to, one of a PID controller, a PID and fuzzy controller combined controller, a variable frequency controller, and a PLC controller.
The online check contact signal sampling unit 6 mainly completes contact signal sampling of the gas density relay 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification. When the contact signal of the gas density relay 1 acts during the calibration, the safe operation of the electrical equipment is not influenced; 2) the contact signal control loop of the gas density relay 1 does not influence the performance of the gas density relay, particularly the performance of the intelligent processor 7, and the gas density relay is not damaged or the test work is not influenced.
The basic requirements or functions of the intelligent processor 7 are: the intelligent processor 7 is used for controlling the temperature regulating mechanism 5 and the valve 4, controlling the pressure regulating mechanism 11 and acquiring signals. The realization is as follows: the pressure value and the temperature value when the contact signal of the gas density relay 1 is detected to act can be converted into the corresponding pressure value P at 20 DEG C20(density value), that is, contact operating value P of gas density relay 1 can be detectedD20And the checking work of the gas density relay 1 is completed. Alternatively, the density value P at the time of the contact signal operation of the gas density relay 1 can be directly detectedD20And the checking work of the gas density relay 1 is completed.
Of course, the intelligent processor 7 may also implement: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent processor 7 also comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent processor 7 simultaneously acquires the current density value, and completes the calibration of the rated pressure value of the gas density relay 1.
Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas insulated cabinets, ring main units, and the like.
The gas density relay system has the functions of pressure and temperature measurement and software conversion. On the premise of not influencing the safe operation of the electrical equipment, the alarm and/or locking contact action value and/or return value of the gas density relay 1 can be detected on line. Of course, the return value of the alarm and/or latch contact signal may also be left untested as desired.
When the gas density relay system completes the calibration of the gas density relay, the mutual comparison and judgment can be automatically carried out, and if the error difference is large, an abnormal prompt can be sent out: gas density relays or pressure sensors, temperature sensors have problems. Namely, the gas density relay system can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter, and has the capability of artificial intelligence checking; after the verification work is finished, a verification report can be automatically generated, and if the verification report is abnormal, an alarm can be automatically sent out or sent to a specified receiver, for example, a mobile phone; the gas density value and the verification result are displayed on site or on the background, and the specific mode can be flexible; the system has the functions of real-time online gas density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like; the gas density value, or the gas density value, the pressure value and the temperature value can be monitored on line; the self-diagnosis function is provided, and abnormal and timely notices such as line breakage, short circuit alarm, sensor damage and the like can be notified; the error performance of the gas density relay system can be compared at different temperatures and different time periods. I.e., comparisons at different times and over the same temperature range, a determination is made as to the performance of the gas density relay system. The comparison of each period with history and the comparison of the history and the present are carried out. The normal and abnormal judgment, analysis and comparison can be carried out on the gas density value of the electrical equipment, the gas density relay 1, the pressure sensor 2 and the temperature sensor 3; the system also comprises an analysis system (expert management analysis system) which is used for detecting, analyzing and judging the gas density value monitoring, the gas density relay and the monitoring element to know where the problem points are; the contact signal state of the gas density relay 1 is also monitored and transmitted remotely. The contact signal state of the gas density relay 1 can be known to be open or closed at the background, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay 1 can be detected, or detected and judged; the contact resistance of the contact point of the gas density relay 1 can be detected or detected and judged; the system has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.
As long as the test data among the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are consistent and normal, the gas density relay system can be indicated to be normal, so that the gas density relay does not need to be checked, other devices do not need to be checked, and the gas density relay system can be free of checking in the whole life. Unless the test data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of a certain electrical device in the transformer substation are inconsistent and abnormal, the maintenance personnel are arranged to process the data. And for the anastomotic and normal conditions, the verification is not needed, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced.
Example two:
as shown in fig. 4, a second embodiment of the present invention provides a gas density monitoring device, including: the gas density relay comprises a gas density relay 1 (the gas density relay 1 mainly comprises a shell, and a base, a pressure detector 103, a temperature compensation element 104, a movement 105, a pointer 106, a dial, an end seat 108, a plurality of signal generators 109 and an electrical equipment connecting joint 1010 which are arranged in the shell), a pressure sensor 2, a temperature sensor 3, a temperature adjusting mechanism 5, a joint signal sampling unit 6, an intelligent processor 7, a heating device 1108 and a second heat preservation piece 1109. The temperature adjusting mechanism 5 is arranged in the shell of the gas density relay 1, and the temperature sensor 3 is also arranged in the shell of the density relay 1. The pressure sensor 2, the online check contact signal sampling unit 6 and the intelligent processor 7 are arranged on the density relay 1. Specifically, the pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the online check contact signal sampling unit 6 is respectively connected with the gas density relay 1 and the intelligent processor 7; the pressure sensor 2, the temperature sensor 3, the temperature adjusting mechanism 5 and the heating device 1108 are respectively connected with the intelligent processor 7. The checking working principle is as follows:
the contact signal sampling unit 6 is adjusted to a checking state through the intelligent processor 7, and in the checking state, the contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay and connects the contact of the gas density relay to the intelligent processor; heating the heating device 1108 by the intelligent processor 7, causing the temperature of the gas in the gas chamber between the valve 4 and the gas density relay to change, closing the valve 4 by the intelligent processor 7 after reaching a set value, and turning off the heating device 1108 by the intelligent processor 7; after the temperature or the pressure of the gas chamber is reduced to be proper, the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism 5 through the intelligent processor 7, the temperature of a temperature compensation element of the gas density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent processor through the contact signal sampling unit, the intelligent processor obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, detects a contact signal action value of the gas density relay, and completes the verification work of the contact signal action value of the gas density relay; after all the contact signal verification work is finished, the intelligent processor opens the valve, and the intelligent processor turns off the temperature adjusting mechanism.
The temperature of the gas density relay 1 is increased by the operation or control of the temperature adjusting mechanism 5 through the intelligent processor 7, and then the temperature of the temperature compensation element of the gas density relay is increased, the temperature change speed is not more than 1.0 ℃ per second when the temperature is close to the action value (even not more than 0.5 ℃ per second, or the requirement is set according to the requirement), namely the temperature requirement is steadily increased or decreased. Until the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent processor 7 through the online checking contact signal sampling unit 6, the intelligent processor 7 obtains a gas density value according to a pressure value and a temperature value when the contact acts, or directly obtains the gas density value, detects a contact signal action value of the gas density relay, and finishes checking work of the contact signal action value of the gas density relay. For example, for a gas density relay with density relay parameters of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the ambient temperature is 5 ℃, the gas pressure of the gas chamber of the electrical equipment 8 is 0.5562MPa (relative pressure), at this time, in the verification system, the pressure value is unchanged, when the temperature rises to 29.5 ℃, the alarm contact thereof operates, the intelligent processor 7 can obtain an alarm contact operating value 0.5317MPa (relative pressure) of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 29.5 ℃ when the contact operates, and the intelligent processor 7 can obtain the error of the alarm contact operating value: and 0.0117MPa (0.5317MPa-0.52 MPa is 0.0117MPa), and the checking of the alarm contact action value of the density relay is completed.
The temperature of the gas density relay 1 is reduced by operating or controlling the temperature adjusting mechanism 5 through the intelligent processor 7, and then the temperature of a temperature compensation element of the gas density relay 1 is reduced, so that the contact point of the gas density relay is reset, the reset of the contact point is transmitted to the intelligent processor 7 through the contact point signal sampling unit 6, the intelligent processor 7 obtains a gas density value according to a pressure value and a temperature value when the contact point is reset, or directly obtains the gas density value, a contact point signal return value of the gas density relay is detected, and the check work of the contact point signal return value of the gas density relay is completed; for example, for the gas density relay with the density relay parameter of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the ambient temperature is 5 ℃, the gas pressure in the electrical equipment 8 is 0.5562MPa (relative pressure), and also in the verification system, the pressure value is unchanged, when the temperature is reduced to 24.8 ℃, the alarm contact is reset, the intelligent processor 7 can obtain the return value 0.5435MPa (relative pressure) of the alarm contact of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 24.8 ℃ when the contact is reset, and the intelligent processor 7 can obtain the switching difference of the alarm contact: and 0.0118MPa (0.5435-0.5317 MPa is 0.0118MPa), so that the action value of the alarm contact of the density relay is verified. The intelligent processor 7 can determine the performance condition (such as pass or fail) of the gas density relay to be verified according to the verification result (verification data) according to the requirement.
When all the contact signal verification operations are completed, the heating element 501 of the temperature adjustment mechanism is turned off by the manual or intelligent processor 7.
Example three:
as shown in fig. 5, a third embodiment of the present invention provides a gas density monitoring device, including: the gas density relay comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a temperature adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent processor 7, a multi-way connector 9, an air supplement interface 10 and a pressure adjusting mechanism 11. One end of the valve 4 is hermetically connected to an electrical device 8, and the other end of the valve 4 is connected to a multi-way connector 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay 1, and the pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the temperature adjusting mechanism 5 is arranged on the density relay 1; the temperature regulating mechanism 5 mainly consists of a heating element 501 and is controlled by the intelligent processor 7, namely, the controller of the heating element 501 is arranged or designed together with the intelligent processor 7. The pressure adjusting mechanism 11 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 11 is communicated with the gas density relay 1; the online check joint signal sampling unit 6 and the intelligent processor 7 are arranged together. And the pressure sensor 2, the temperature sensor 3, the valve 4, the temperature regulating mechanism 5 and the pressure regulating mechanism 11 are respectively connected with the intelligent processor 7. The air supply interface 10 is communicated with the multi-way joint 9.
Unlike the first embodiment, the present embodiment further includes a pressure adjustment mechanism 11. The pressure adjusting mechanism 11 includes an air bag 1103 and a driving mechanism 1102, and the driving mechanism 1102 drives the air bag 1103 to move in the pressure adjusting mechanism, so as to complete the lifting of the pressure. The air bag 1103 in this embodiment may be replaced by a bellows.
The working principle is as follows: the online check contact signal sampling unit 6 is adjusted to a check state through the intelligent processor 7, and in the check state, the online check contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay 1 and connects the contact of the gas density relay 1 to the intelligent processor 7; and closing the valve 4 between the gas density relay 1 and the electrical equipment by the intelligent processor 7; the intelligent processor 7 drives the pressure adjusting mechanism 11 to slowly reduce the pressure of the gas density relay, and after the pressure is reduced to a target pressure value, the operation can be stopped. Then, the temperature of the gas density relay 1 is increased by the operation or control of the temperature adjusting mechanism 5 by the intelligent processor 7, and the temperature of the temperature compensation element of the gas density relay is increased, so that the gas density relay generates a contact action, the contact action is transmitted to the intelligent processor 7 through the online verification contact signal sampling unit 6, the intelligent processor 7 obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, detects a contact signal action value of the gas density relay, and completes the verification work of the contact signal action value of the gas density relay, which is similar to the first embodiment. The intelligent processor 7 also comprises a depth calculation unit capable of calculating, from the ambient temperature value, the gas density value or the pressure value of the electrical apparatus,
through the operation or control of intelligent processor 7 to temperature regulation mechanism 5, make the temperature of gas density relay 1 reduce, and then the temperature reduction of gas density relay's temperature compensation component, make gas density relay take place the contact and reset, the contact resets and transmits intelligent processor 7 through online check contact signal sampling unit 6, intelligent processor 7 obtains gas density value according to the pressure value when the contact resets, the temperature value, or directly obtains gas density value, detect out the contact signal return value of gas density relay, accomplish the check-up work of gas density relay's contact signal return value.
After all the contact signal verification work is finished, the heating element of the temperature adjusting mechanism is turned off through the intelligent processor 7, the online verification contact signal sampling unit 6 is adjusted to be in a working state, and a control loop of a contact signal of the gas density relay recovers to be in a normal working state. In this embodiment, the operation sequence of the temperature adjusting mechanism and the pressure adjusting mechanism can be flexible, that is, the pressure adjusting mechanism can be operated first, and then the temperature adjusting mechanism can be operated; or the temperature adjusting mechanism can be operated firstly, and then the pressure adjusting mechanism can be operated; or the pressure adjustment mechanism and the temperature adjustment mechanism may be operated simultaneously.
Example four:
as shown in fig. 6, a fourth embodiment of the present invention provides a gas density monitoring device, including: the gas density relay comprises a gas density relay 1, a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a temperature adjusting mechanism 5, an online check joint signal sampling unit 6, an intelligent processor 7, a multi-way joint 9, an air chamber 1107, a heating device 1108, a second heat preservation piece 1109, an air supply interface 10 and a micro-water sensor 12 (a micro-water sensor probe 1201). The air inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the multi-way joint 9. The gas density relay 1, the pressure sensor 21, the temperature sensor 31, the online check contact signal sampling unit 6 and the intelligent processor 7 are arranged together and are arranged on the gas density relay 1; the second pressure sensor 22 and the second temperature sensor 32 are provided on the side of the valve 4 to which the electrical connection terminals are connected. The first pressure sensor 21 and the pressure detector of the gas density relay 1 are communicated with the gas chamber 1107 on a gas path; the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are connected with the intelligent processor 7; the valve 4 is connected with an intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7. The checking principle is as follows:
the contact signal sampling unit 6 is adjusted to a checking state through the intelligent processor 7, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay and connects the contact of the gas density relay to the intelligent processor;
heating the heating device 1108 by the intelligent processor 7 to cause the temperature of the gas in the gas chamber 1107 to change, closing the valve 4 by the intelligent processor after the set value is reached, and then turning off the heating device 1108 by the intelligent processor;
after the temperature or the pressure of the gas chamber 1107 is reduced to a proper value, the intelligent processor 7 controls the temperature adjusting mechanism 5 to increase the temperature of the gas density relay 1, and then the temperature of the temperature compensation element of the gas density relay is increased, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent processor through the contact signal sampling unit, the intelligent processor obtains a gas density value according to the pressure value and the temperature value when the contact is acted, or directly obtains the gas density value, detects the contact signal action value of the gas density relay, and completes the calibration work of the contact signal action value of the gas density relay;
after all the contact signal verification work is finished, the intelligent processor opens the valve, and the intelligent processor turns off the temperature adjusting mechanism.
Different from the first embodiment, there are two pressure sensors, namely a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The temperature sensor 32 may also be omitted in this embodiment. The pressure sensor comprises a plurality of pressure sensors and temperature sensors, and the pressure values monitored by the pressure sensors can be compared and verified with each other; the temperature values obtained by the plurality of temperature sensors can be compared and verified mutually; the corresponding gas density values obtained by monitoring the pressure sensors and the temperature sensors can be compared and verified with each other.
Example five:
as shown in fig. 7, a fifth embodiment of the present invention provides a gas density monitoring device, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a temperature adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 7. The temperature adjusting mechanism 5 is configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay 1, so that the gas density relay 1 generates a contact signal action; the online check contact signal sampling unit 6 is connected with the gas density relay 1 and is configured to sample a contact signal of the gas density relay 1; wherein the contact signal comprises an alarm and/or a latch; the temperature adjusting mechanism 5 is arranged on the gas density relay 1, and the temperature adjusting mechanism 5 mainly comprises a heating element 501, a heat preservation member 502, a controller 504, a temperature detector 3 (same as a temperature sensor), a temperature adjusting mechanism shell 503 and the like. The controller 504 may use PID control, or a combination of PID and fuzzy control. The range of power for the heating element 501 to electrically heat the work is controlled by the controller 504 and the temperature rise and fall range setting. The variation amplitude of the temperature is controlled by different power levels. The degree of deviation may be set to advance heating or cooling. The temperature in the temperature adjusting mechanism 5 is measured by the intelligent processor 7 and the controller 504, and when the action value of the contact signal of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the action value is approached, or the requirement is set according to the requirement), namely the temperature requirement is stably increased or decreased.
Example six:
as shown in fig. 8, a gas density relay (or density monitoring device) according to a sixth embodiment of the present invention, referring to fig. 8, further includes a valve 4 and a heating device 1108; one end of the valve 4 is connected with a connector 1010 (the connector 1010 is communicated with electrical equipment), the other end of the valve 4 is communicated with the gas density relay 1, and the valve 4 is connected with an intelligent processor 7; the heating device 1108 is arranged on a connecting pipe of the gas density relay 1, and the inside of the connecting pipe is hollow; the heating device is connected with the intelligent processor; a heat preservation part 1109 is arranged outside the heating device 1108; according to the set verification time or/and the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and can be verified:
the contact signal sampling unit 6 is adjusted to a checking state through the intelligent processor 7, and in the checking state, the contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay 1 and connects a contact of the gas density relay to the intelligent processor 7; heating the heating device 1108 by the intelligent processor 7, causing the temperature of the gas in the gas chamber inside the connecting pipe between the valve 4 and the gas density relay 1 to change, closing the valve 4 by the intelligent processor 7 after a set value (for example, the set value temperature is 70 ℃), and then turning off the heating device 1108 by the intelligent processor 7; after the temperature or the pressure of the gas chamber in the connecting pipe is reduced to be proper (for example, the ambient temperature is minus 10 ℃), the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism 5 through the intelligent processor 7, and then the temperature of the temperature compensation element of the gas density relay 1 is increased (assuming that the height is 38.5 ℃), so that the gas density relay 1 generates contact point actions, the contact point actions are transmitted to the intelligent processor 7 through the contact point signal sampling unit 6, the intelligent processor 7 obtains a gas density value according to the pressure value and the temperature value when the contact point actions, or directly obtains the gas density value, detects a contact point signal action value of the gas density relay, and completes the verification work of the contact point signal action value of the gas density relay; when all the contact signal verification work is completed, the intelligent processor 7 opens the valve 4, and the intelligent processor 7 turns off the temperature adjusting mechanism 5.
Example seven:
as shown in fig. 9, the online verification contact signal sampling unit 6 is provided with a contact sampling circuit. In this embodiment, the contact sampling circuit includes a photo coupler OC1 and a resistor R1, and the photo coupler OC1 includes a light emitting diode and a photo transistor; the anode of the light emitting diode and the contact point P of the gas density relay 1JAre connected in series to form a closed loop; the emitting electrode of the phototriode is grounded; the collector of the phototriode is used as the output end out6 of the on-line check contact signal sampling unit 6 to be connected with the intelligent processor 7, and the collector of the phototriode is also connected with a power supply through the resistor R1.
By the contact sampling circuit, the contact P of the gas density relay 1 can be known convenientlyJWhether open or closedStatus. Specifically, when the contact point P isJWhen the light-emitting diode is closed, the closed loop is electrified, the light-emitting diode emits light, the phototriode is conducted by the light, and the collector of the phototriode outputs a low level; when the contact point P isJWhen the LED is disconnected, the closed loop is disconnected, the LED does not emit light, the phototriode is cut off, and the collector of the phototriode outputs high level. Thus, the high and low levels are output through the output terminal out6 of the line verification contact signal sampling unit 6.
In this embodiment, the intelligent processor 7 is isolated from the contact signal control loop by the photoelectric isolation method, and the contact P is closed in the verification processJOr contact P in the event of gas leakageJA shutdown also occurs, at which time a low level of the collector output of the phototransistor is detected. Controlling the closing of the contact P during the verification processJIs within a predetermined length so that the contact point P is checked without leakageJThe length of the duration time of the closed state is determined, and whether the contact P occurs in the verification process can be judged by monitoring the duration time of the received low levelJAnd closing. Therefore, the alarm signal generated by the gas density relay 1 during verification can be judged by recording the time during verification, and is not the alarm signal generated during gas leakage.
In this embodiment, the intelligent processor 7 is mainly composed of a processor 71(U1) and a power supply 72 (U2).
Example eight:
as shown in fig. 10, the online verification contact signal sampling unit 6 is provided with a contact sampling circuit. In this embodiment, the contact sampling circuit includes a first photo coupler OC1 and a second photo coupler OC 2.
The light emitting diode of the first photoelectric coupler OC1 and the light emitting diode of the second photoelectric coupler OC2 are respectively connected in parallel through a current limiting resistor, and after being connected in parallel, the light emitting diodes are connected in series with the contact of the gas density relay to form a closed loop, and the connection directions of the light emitting diodes of the first photoelectric coupler OC1 and the second photoelectric coupler OC2 are opposite; the collector of the phototriode of the first photoelectric coupler OC1 and the collector of the phototriode of the second photoelectric coupler OC2 are both connected with a power supply through a divider resistor, the emitter of the phototriode of the first photoelectric coupler OC1 is connected with the emitter of the phototriode of the second photoelectric coupler OC2 to form an output end out6, and the output end out6 is connected with the intelligent processor 7 and is grounded through a resistor R5.
By the contact sampling circuit, the contact P of the gas density relay 1 can be known convenientlyJWhether open or closed. Specifically, when the contact point P isJWhen the circuit is closed, the closed loop is electrified, the first photoelectric coupler OC1 is conducted, the second photoelectric coupler OC2 is cut off, and the emitter (i.e. the output end out6) of the phototriode of the first photoelectric coupler OC1 outputs high level; or, the first photo coupler OC1 is turned off, the second photo coupler OC2 is turned on, and the emitter (i.e., the output end out6) of the photo transistor of the second photo coupler OC2 outputs a high level. When the contact point P isJWhen the circuit is opened, the closed loop is powered off, the first photoelectric coupler OC1 and the second photoelectric coupler OC2 are both cut off, and the emitters (i.e., the output end out6) of the phototransistors of the first photoelectric coupler OC1 and the second photoelectric coupler OC2 output low level.
In a preferred embodiment, the contact sampling circuit further includes a first voltage regulator diode group and a second voltage regulator diode group, the first voltage regulator diode group and the second voltage regulator diode group are connected in parallel to the contact signal control loop, and the connection directions of the first voltage regulator diode group and the second voltage regulator diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are respectively formed by connecting one, two or more than two voltage stabilizing diodes in series.
In this embodiment, the first zener diode group includes a first zener diode D1 and a second zener diode D2 connected in series, and a cathode of the first zener diode D1 is connected to an anode of the second zener diode D2; the second zener diode group comprises a third zener diode D3 and a fourth zener diode D4 which are connected in series, and the anode of the third zener diode D3 is connected with the cathode of the fourth zener diode D4.
The contact sampling circuit can conveniently realize the contact P of the gas density relay 1JIs monitored, and the intelligent processor 7 is combined to monitor the contact point PJWhether the power grid is in an open state or a closed state is correspondingly processed, remote transmission is implemented, the signal state of the contact is known from a background, and the reliability of the power grid is greatly improved.
In this embodiment, the intelligent processor 7 is mainly composed of a processor 71(U1) and a power supply 72 (U2).
Example nine:
as shown in fig. 11, the smart processor 7 is mainly composed of a processor 71(U1), a power supply U2(72), a communication module 73(U3), a smart processor protection circuit 74(U4), a display and output and operation 75(U5), a data storage 76(U6), and the like. The processor 71(U1) contains a crystal oscillator and filter circuitry. The smart processor protection circuit 74(U4) includes surge protection circuitry, filter circuitry, short circuit protection circuitry, polarity protection circuitry, over-voltage protection circuitry, and the like. The power supply has 2 grades and also comprises a voltage reduction module.
The communication mode of the communication module 73(U3) may be wired: such as RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; or wireless: such as 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar and the like. The display and output 75(U5) may be: nixie tubes, LEDs, LCDs, HMI, displays, matrix screens, printers, faxes, projectors, mobile phones and the like can be flexibly combined by one or a plurality of types. The data store 76(U6) may be: FLASH memory cards such as FLASH, RAM, ROM, hard disk, SD, etc., magnetic tapes, punched paper tapes, optical disks, U disks, discs, films, etc., can be flexibly combined by one or more types.
Example ten:
as shown in fig. 12, the smart processor 7 is mainly composed of a processor 71(U1), a power supply 72(U2), a communication module 73(U3), a smart processor protection circuit 74(U4), and the like. The processor 71(U1) contains a crystal oscillator and filter circuitry. The smart processor protection circuit 74(U4) includes surge protection circuitry, filter circuitry, short circuit protection circuitry, polarity protection circuitry, over-voltage protection circuitry, and the like. The power supply has 2 grades and also comprises a voltage reduction module. The pressure sensor 2 passes through the overvoltage protection circuit, the operational amplifier circuit, the modulator circuit, and the filter circuit to the processor 71 (U1). In the communication module 73(U3), the communication chip is connected to the communication interface through the surge protection circuit.
Example eleven:
FIG. 13 is a schematic diagram of a 4-20mA type density transmitter circuit on a gas density relay. As shown in fig. 13, the 4-20Ma type density transmitter is mainly composed of a microprocessor, a power supply, a modulation circuit, a current loop, a protection circuit, a pressure sensor, an operational amplifier, a temperature sensor, a proportional modulation module, a voltage reduction module, and the like. The microprocessor contains a crystal oscillator and a filter circuit. The protection circuit comprises a surge protection circuit, a filter circuit, a short-circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit and the like. The analog pressure sensor passes through the overvoltage protection circuit, the operational amplifier circuit, the modulation circuit and the filter circuit to the microprocessor, so that the microprocessor can acquire a pressure value and an acquired temperature value, and the microprocessor calculates and converts the temperature value to obtain a density value signal. The density value signal passes through a proportion modulation module, a modulation circuit and a current loop to obtain the density value of 4-20 Ma.
In a word, after passing through an amplifying circuit, the simulated pressure sensor, the simulated temperature sensor and the simulated micro-water sensor are converted into A/D (analog to digital) and then are converted into MCU (microprogrammed control unit) to realize the collection of pressure, temperature and water. The intelligent processor 7 can contain or be connected with a printer and a liquid crystal display, and can also realize USB storage and RS232 communication.
Example twelve:
fig. 14 is a schematic diagram of a remote gas density relay system according to a twelfth embodiment. As shown in fig. 14, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of gas density monitoring devices are connected with the background monitoring terminal through the concentrator and the IEC61850 protocol converter in sequence. Wherein, each gas density relay is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber. In this embodiment, the background monitor terminal PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via a HUB 0. Each HUB is connected with a group of gas density monitoring devices, such as a HUB1 connected with gas density monitoring devices Z11, Z12 and … … Z1n, a HUB2 connected with gas density monitoring devices Z21, Z22 and … … Z2n and … …, and a HUB hom connected with gas density monitoring devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.
The background monitor terminal includes: 1) a background software platform: based on Windows, Linux, and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS. 2) A background software key business module: such as rights management, device management, data storage queries, etc., as well as user management, alarm management, real-time data, historical data, real-time profiles, historical profiles, configuration management, data collection, data parsing, record condition, exception handling, etc. 3) Interface configuration: such as Form interface, Web interface, configuration interface, etc.
Example thirteen:
fig. 15 is a schematic structural diagram of a remote gas density relay system according to the thirteenth embodiment. In this embodiment, a network switch Gateway, an integrated application Server, and a protocol converter/online monitoring intelligent unit ProC are added in comparison with the twelfth embodiment. In this embodiment, the background monitor terminal PC connects two integrated application servers 1, Server2 through network switch Gateway, two integrated application servers 1, Server2 communicate with a plurality of protocol converters/online monitoring intelligent units ProC (ProC1, ProC2, … … ProCn) through station control layer a network and B network, and protocol converters/online monitoring intelligent units ProC communicate with a plurality of HUB (HUB1, HUB2, … … bm) through R5485 network. Each HUB is connected with a group of gas density monitoring devices, such as a HUB1 connected with gas density monitoring devices Z11, Z12 and … … Z1n, a HUB2 connected with gas density monitoring devices Z21, Z22 and … … Z2n and … …, and a HUB is connected with gas density monitoring devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.
Example fourteen:
fig. 16 is a schematic diagram of a remote gas density relay system according to the fourteenth embodiment. The present embodiment is a schematic diagram of a wireless transmission mode, and a dashed box in the diagram indicates that the wireless module Wn and the gas density monitoring device Zn may be integrated or separated, and the specific scheme may be flexible.
The multiple integrated application servers 1, servers 2 and … … servers n are in Wireless communication with the gas density monitoring devices through the cloud end Cluod, the Wireless Gateway (Wireless Gateway) and the Wireless modules of the gas density monitoring devices. Wherein n is a natural number.
Besides on-line checking of the gas density relay, the system can monitor physical quantities such as temperature, pressure, density and micro-water of SF6 gas in electrical equipment such as a circuit breaker and a GIS and the variation trend of the physical quantities, is provided with a communication interface, and uploads data to a background monitoring terminal, so that the on-line monitoring function of the physical quantities such as SF6 gas density and micro-water of the electrical equipment such as the circuit breaker and the GIS is realized, the alarm limit can be flexibly set, historical data can be inquired on site, the gas leakage trend and the gas leakage rate of the equipment can be accurately analyzed and judged, the abnormal condition of the equipment can be found in advance, the safe operation of the whole set of the electrical equipment and the substation can be guaranteed, and the on-line monitoring of the electrical equipment of the substation, particularly. The configuration principle is as follows: the system is constructed by adopting a bus type layered distributed structure, and the requirements of a three-layer system structure of the intelligent substation are met: the system comprises a process layer (a sensor layer, namely a gas density relay), a spacing layer (a data transmission and collection processing layer), a station control layer (a monitoring host, a database server and the like), and the whole system adopts an IEC61850 standard electric power communication protocol. The background monitoring terminal is responsible for collecting, comprehensively analyzing, diagnosing faults, storing and forwarding standardized data of monitoring data and has the functions of real-time data display, change trend analysis, historical data query, real-time alarm and the like. The system can realize on-line monitoring of gas density and micro water of high-voltage electrical equipment without on-site, can check and detect a gas density relay on line, can provide a solid basis for the state maintenance of SF6 electrical equipment through expert analysis software, big data analysis and trend analysis, meets the requirements of power grid automation and equipment state maintenance, and plays an important role in improving the safe operation and operation management level of a power grid system, developing prospective diagnosis and trend analysis and reducing unplanned power failure maintenance.
The checking precision of the gas density relay can be related to the power industry or national standard. Under different temperatures, the calibration requirements can be specified according to national standards or industry standards, for example, according to 4.8 temperature compensation performances in DL/T259 sulfur hexafluoride gas density relay calibration regulations, the accuracy requirements, namely the error determination requirements, corresponding to each temperature value are different, and the calibration requirements can be specified according to standards or otherwise. The comparison and judgment of the same period (or the same season) of different years can be carried out. For example, the checking result of 5 months in 2021 can be directly compared with the checking result of 5 months in 2019 and 5 months in 2020, trend analysis is carried out, and judgment is carried out. The verification can be carried out when the verification is needed, and a movable design can be carried out, namely the operation of the A transformer substation can be carried out for a period of time, after the task is completed, the B transformer substation can be moved to operate for a period of time, and after the task is completed, the C transformer substation can be moved to operate.
The gas density relay has the advantages that the checking precision can reach 20 degrees and is 0.25 grade, the checking precision can reach 0.625 grade at high temperature or low temperature, the checking precision meets the requirements, and the requirements or related specifications are met economically and quantificationally.
A gas density monitoring devices that relates among teletransmission gas density relay system can refer to its component element and design the gas density relay of an organic whole structure, also can refer to its component element and design the gas density monitoring devices of components of a whole that can function independently structure.
Remote gas density relay system: when the gas density relay is checked at the ambient temperature of high temperature, low temperature, normal temperature and 20 ℃, the error judgment requirements of the system can be different, and the system can be implemented according to the temperature requirements and the related standards; the error performance of the gas density relay can be compared in different time periods at different temperatures according to the error performance of the gas density relay. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the gas density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The gas density relay system can also be subjected to physical examination. When necessary, the gas density relay can be checked at any time; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay. The density value of the electrical equipment, the gas density relay, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, a system, the gas density relay and the like, can be judged, compared and analyzed; the contact signal state of the gas density relay is monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay can be detected, or detected and judged; the contact resistance of the contact point of the gas density relay can be detected or detected and judged; and the insulating property of the gas density relay is also detected, or detected and judged. In addition, for the SF6 gas, a specific conversion method of the pressure-temperature characteristic of the SF6 gas can be calculated according to the Betty-Bridgman equation; for the SF6 mixed gas, a specific conversion method of the pressure-temperature characteristic of the SF6 mixed gas can be calculated according to a Dalton partial pressure law, a Betty-Bridgman equation and an ideal gas state equation. The temperature regulating mechanism is arranged in the shell of the gas density relay or outside the shell and is arranged on the shell. The communication equipment is arranged inside or outside the shell of the gas density relay or inside or outside the shell of the circuit control part, and the mode can be flexibly set according to the requirement. The temperature sensor may be digital or analog. The signal generator comprises but is not limited to a microswitch, a magnetic auxiliary electric contact, a reed switch and a miniature switch, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector includes, but is not limited to, a bourdon tube, a bellows + spring, a pressure sensor; the temperature compensation element includes, but is not limited to, a temperature compensation sheet, a gas enclosed in the housing, and a temperature compensation sheet + a gas enclosed in the housing.
The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (61)
1. A remote gas density relay system, comprising:
the background monitoring terminal is in remote communication with at least one gas density monitoring device through the communication equipment; the communication equipment is used for realizing data transmission of the background monitoring terminal and the gas density monitoring device; the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a temperature adjusting mechanism, an online checking contact signal sampling unit and a circuit control part; wherein,
the temperature adjusting mechanism is an adjustable temperature adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay so as to enable the gas density relay to generate contact action;
a gas density detection sensor including at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or, a density detection sensor adopting quartz tuning fork technology; the gas density detection sensor is communicated with the gas density relay;
the online check contact signal sampling unit is directly or indirectly connected with the gas density relay and is configured to sample a contact signal generated by contact action of the gas density relay, wherein the contact signal comprises an alarm and/or a lock;
the circuit control part comprises a power supply and an intelligent processor for supplying power to each electric device; the intelligent processor is respectively connected with the gas density detection sensor, the temperature adjusting mechanism, the online checking contact signal sampling unit and the communication equipment, is configured to be direct or receive the remote control instruction of the background monitoring terminal, completes the control of the temperature adjusting mechanism, the collection of pressure values and temperature values and/or the collection of gas density values, detects the contact signal action values and/or contact signal return values of the gas density relay, and sends test data and/or checking results to the background monitoring terminal through the communication equipment in real time.
2. The remote gas density relay system of claim 1, wherein: the background monitoring terminal comprises a storage device used for storing data and/or information transmitted to the background monitoring terminal through the communication equipment.
3. The remote gas density relay system of claim 1, wherein: the background monitoring terminal comprises a display interface for man-machine interaction, displays current verification data and/or information in real time, and/or supports data input.
4. The remote gas density relay system of claim 1, wherein: the communication equipment is arranged at the shell of the gas density relay, or at the shell of the circuit control part, or the communication equipment and the intelligent processor are of an integrated structure.
5. The remote gas density relay system of claim 1, wherein: the communication mode of the communication equipment is a wired communication mode or a wireless communication mode.
6. The remote gas density relay system of claim 1, wherein: the gas density relay includes, but is not limited to, a bimetallic strip compensated gas density relay, a gas compensated gas density relay, a bimetallic strip and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
7. The remote gas density relay system of claim 1, wherein: the gas density relay includes: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a signal generator, wherein the base, the pressure detector, the temperature compensation element and the signal generator are arranged in the shell; wherein,
the signal generator comprises a microswitch or a magnetic auxiliary electric contact, and the gas density relay outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
8. The remote gas density relay system of claim 7, wherein: at least one temperature sensor is arranged near or on or integrated in the temperature compensation element of the gas density relay.
9. The remote gas density relay system of claim 8, wherein: at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay, which is close to the temperature compensation element.
10. The remote gas density relay system of claim 8, wherein: and a leading-out wire sealing piece is arranged in the shell of the gas density relay, and the connecting wire of the temperature sensor is connected with the intelligent processor through the leading-out wire sealing piece.
11. The remote gas density relay system of claim 7, wherein: the gas density relay further comprises a heat insulation piece which is arranged between the shell of the gas density relay and the shell of the circuit control part; alternatively, the thermal insulation is disposed at the power source.
12. The remote gas density relay system of claim 7, wherein: the power source is located remotely from the temperature sensor and the temperature compensation element, wherein the remote is: under the normal working state, the power supply generates heat and does not influence the temperature sensor and the temperature compensation element.
13. The remote gas density relay system of claim 7, wherein: the gas density relay outputs a contact signal through the signal generator.
14. The remote gas density relay system of claim 7, wherein: the gas density relay also comprises a display mechanism, wherein the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; or,
the display mechanism comprises a digital device or a liquid crystal device with a display value display.
15. The remote gas density relay system of claim 1, wherein: the gas density detection sensor is arranged on the gas density relay; or the temperature adjusting mechanism is arranged inside or outside the gas density relay; or the gas density detection sensor, the online check contact signal sampling unit and the intelligent processor are arranged on the gas density relay.
16. The remote gas density relay system of claim 15, wherein: the gas density relay and the gas density detection sensor are of an integrated structure; or the gas density relay and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
17. The remote gas density relay system of claim 1, wherein: the gas density detection sensor is of an integrated structure; or, the gas density detection sensor is a gas density transmitter with an integrated structure.
18. The remote gas density relay system of claim 17, wherein: the online checking contact signal sampling unit and the intelligent processor are arranged on the gas density transmitter.
19. The remote gas density relay system of claim 1, wherein: and a probe of the pressure sensor is arranged on a gas path of the gas density relay.
20. The remote gas density relay system of claim 1, wherein: the pressure sensor is arranged in the shell of the gas density relay or in the shell of the circuit control part.
21. The remote gas density relay system of claim 1, wherein: and the probe of the temperature sensor is arranged on or outside the gas path of the gas density relay, or in the shell of the gas density relay, or outside the shell of the gas density relay.
22. The remote gas density relay system of claim 1, wherein: the pressure sensors include, but are not limited to, relative pressure sensors, and/or absolute pressure sensors.
23. The remote gas density relay system of claim 1, wherein: the temperature adjusting mechanism is a heating element; or,
the temperature adjusting mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature adjusting mechanism shell; or,
the temperature adjusting mechanism comprises a heating element and a temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a controller and a temperature detector; or,
the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or,
the temperature adjusting mechanism is a miniature thermostat;
the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors;
the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.
24. The remote gas density relay system of claim 1, wherein: the gas density relay is characterized by further comprising a valve, wherein one end of the valve is provided with a connecting port communicated with the electrical equipment, and the other end of the valve is communicated with a gas path of the gas density relay.
25. The remote gas density relay system of claim 24, wherein: the valve is also connected with the intelligent processor, and the valve is closed or opened under the control of the intelligent processor.
26. The remote gas density relay system of claim 24, wherein: the valve communicates with the electrical device directly or through a connection joint.
27. The remote gas density relay system of claim 24, wherein: the valve is an electric valve, or an electromagnetic valve, or a piezoelectric valve, or a temperature control valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
28. The remote gas density relay system of claim 24, wherein: the valve is closed or opened in a hose bending or flattening mode.
29. The remote gas density relay system of claim 24, wherein: the valve is sealed within a chamber or housing.
30. The remote gas density relay system of claim 24, wherein: pressure sensors are respectively arranged on two sides of the gas path of the valve; or,
and pressure or density detectors are respectively arranged on two sides of the gas path of the valve.
31. The remote gas density relay system of claim 24, wherein: the self-sealing valve is arranged between the electrical equipment and the valve; alternatively, the valve is mounted between an electrical device and the self-sealing valve.
32. The remote gas density relay system of claim 24, wherein: the gas path of the pressure adjusting mechanism is communicated with the gas path of the gas density relay; the pressure regulating mechanism is also connected with the intelligent processor, and is used for regulating the pressure rise and fall of the gas density relay under the control of the intelligent processor so as to be matched with or/and combined with the temperature regulating mechanism to enable the gas density relay to generate contact action; or,
further comprising: the intelligent processor is connected with the heating device; or,
the intelligent gas density relay is characterized by further comprising an air chamber and a heating device, the air chamber is communicated with a gas path of the gas density relay, the heating device is arranged outside or inside the air chamber, and the intelligent processor is connected with the heating device.
33. The remote gas density relay system of claim 32, wherein: the valve and the pressure regulating mechanism are sealed in a cavity or a shell; or,
the pressure regulating mechanism is sealed in a cavity or a shell.
34. The remote gas density relay system of claim 32, wherein: during verification, the pressure adjusting mechanism is a closed air chamber, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased; or,
the pressure adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with the gas circuit of the gas density relay; a piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod to further drive the piston to move in the cavity; or,
the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber and is in sealed contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the gas density relay; or,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay, and the other end of the corrugated pipe stretches under the driving of the driving part; or,
the pressure adjusting mechanism is a deflation valve, and the deflation valve is an electromagnetic valve or an electric valve or a deflation valve realized in an electric or gas mode; or,
the pressure regulating mechanism is a compressor; or,
the pressure regulating mechanism is a pump, and the pump comprises but is not limited to one of a pressure generating pump, a booster pump, an electric air pump and an electromagnetic air pump;
wherein the driving component includes, but is not limited to, one of a magnetic force, a motor, a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.
35. The remote gas density relay system of claim 32, wherein: the gas density relay, the valve and the pressure regulating mechanism are connected together through a connecting pipe.
36. The remote gas density relay system of claim 35, wherein: the gas path of the pressure regulating mechanism is communicated with the gas path of the gas density relay through a first connecting pipe; the gas outlet of the valve is directly communicated with the gas circuit of the gas density relay through a second connecting pipe, or the gas outlet of the valve is connected with the gas circuit of the pressure regulating mechanism through a second connecting pipe, so that the valve is communicated with the gas circuit of the gas density relay.
37. The remote gas density relay system of claim 32, wherein: the gas density relay also comprises a multi-way joint, the gas density relay is arranged on the multi-way joint, and/or the valve is arranged on the multi-way joint, and/or the pressure regulating mechanism is arranged on the multi-way joint; and/or the intelligent processor is arranged on the multi-way connector.
38. The remote gas density relay system of claim 37, wherein: the gas path of the gas density relay is connected with the first interface of the multi-way connector; the gas path of the pressure regulating mechanism is connected with a second interface of the multi-way connector, and the first interface is communicated with the second interface so as to communicate the gas path of the pressure regulating mechanism with the gas path of the gas density relay; and the gas outlet of the valve is communicated with a third interface of the multi-way joint, and the third interface is communicated with the first interface, so that the gas outlet of the valve is communicated with the gas circuit of the pressure regulating mechanism and/or the gas circuit of the gas density relay.
39. The remote gas density relay system of claim 1, wherein: the online check joint signal sampling unit and the intelligent processor are arranged together.
40. The remote gas density relay system of claim 39, wherein: the online check joint signal sampling unit and the intelligent processor are sealed in a cavity or a shell.
41. The remote gas density relay system of claim 1, wherein: the contact of the gas density relay is a normally-open density relay, the online check contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay and a contact signal control circuit, and the second connecting circuit is connected with the contact of the gas density relay and the intelligent processor; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the online checking contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit and connects the contact of the gas density relay with the intelligent processor; or,
the contact of the gas density relay is a normally closed density relay, the online check contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay and a contact signal control circuit, and the second connecting circuit is connected with the contact of the gas density relay and the intelligent processor; in a non-verification state, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; under the check-up state, online check-up contact signal sampling unit closes contact signal control circuit cuts off the connection of gas density relay's contact and contact signal control circuit, the intercommunication the second connecting circuit, will gas density relay's contact with intelligent processor is connected.
42. The remote gas density relay system of claim 41, wherein: the first connecting circuit comprises a first relay, the second connecting circuit comprises a second relay, the first relay is provided with at least one normally closed contact, the second relay is provided with at least one normally open contact, and the normally closed contact and the normally open contact are kept in opposite switch states; the normally closed contact is connected in series in the contact signal control loop, and the normally open contact is connected to the contact of the gas density relay;
in a non-checking state, the normally closed contact is closed, the normally open contact is opened, and the gas density relay monitors the output state of the contact in real time; under the check-up state, normally closed contact disconnection, normally open contact is closed, the contact of gas density relay passes through normally open contact with intelligent treater is connected.
43. The remote gas density relay system of claim 1, wherein: the intelligent processor acquires a gas density value acquired by the gas density detection sensor; or the intelligent processor acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the online monitoring of the gas density of the monitored electrical equipment by the gas density monitoring device.
44. The remote gas density relay system of claim 1, wherein: the intelligent processor acquires the gas density value acquired by the gas density detection sensor when the gas density relay generates contact signal action or switching, and completes the online verification of the gas density relay; or,
the intelligent processor obtains a pressure value and a temperature value acquired by the gas density detection sensor when the gas density relay generates contact signal action or switching, and converts the pressure value and the temperature value into a corresponding pressure value of 20 ℃ according to gas pressure-temperature characteristics, namely a gas density value, so as to complete the online verification of the gas density relay.
45. The remote gas density relay system of claim 1, wherein: the intelligent processor automatically controls the whole checking process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic, input and output.
46. The remote gas density relay system of claim 1, wherein: the intelligent processor is provided with an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or analog quantity and digital quantity information input.
47. The remote gas density relay system of claim 46, wherein: the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged and/or preventing electromagnetic interference caused by the misconnection of a user.
48. The remote gas density relay system of claim 1, wherein: the intelligent processor is also provided with a clock, and the clock is configured to be used for regularly setting the checking time of the gas density relay, or recording the testing time, or recording the event time.
49. The remote gas density relay system of claim 1, wherein: the control of the intelligent processor is controlled by field control and/or the background monitoring terminal.
50. The remote gas density relay system of claim 1, wherein: the remote transmission gas density monitoring device system also comprises a shielding piece which can shield an electric field and/or a magnetic field, and the shielding piece is arranged in the shell or outside the shell of the circuit control part; or,
the shielding piece is arranged on the intelligent processor and/or the communication equipment; or,
the shield is disposed on the pressure sensor.
51. The remote gas density relay system of claim 1, wherein: the intelligent processor compares the environmental temperature value with the temperature value collected by the temperature sensor to complete the check on the temperature sensor.
52. The remote gas density relay system of claim 1, wherein: the gas density relay is provided with a comparison density value output signal which is connected with the intelligent processor; or the gas density relay is provided with a comparison pressure value output signal which is connected with the intelligent processor.
53. The remote gas density relay system of claim 52, wherein: when the gas density relay outputs a comparison density value output signal, the intelligent processor collects the current gas density value, performs comparison to complete comparison density value verification on the gas density relay, and the intelligent processor or/and the background monitoring terminal judges a comparison result and sends an abnormal prompt if the error is out of tolerance; or,
when the gas density relay outputs a comparison density value output signal, the intelligent processor acquires the current gas density value, compares the gas density value with the current gas density value, completes mutual verification of the gas density relay and the gas density detection sensor, judges a comparison result by the intelligent processor or/and the background monitoring terminal, and sends an abnormal prompt if the error is out of tolerance; or,
when the gas density relay outputs a comparison pressure value output signal, the intelligent processor collects the current pressure value, the comparison is carried out, mutual verification of the gas density relay and the gas density detection sensor is completed, the intelligent processor or/and the background monitoring terminal judges the comparison result, and if the error is out of tolerance, an abnormal prompt is sent.
54. The remote gas density relay system of claim 1, wherein: the gas density detection device comprises at least two gas density detection sensors, wherein each gas density detection sensor comprises a pressure sensor and a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.
55. The remote gas density relay system of claim 1, wherein: the gas density detection sensor comprises at least two pressure sensors, and pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.
56. The remote gas density relay system of claim 1, wherein: the gas density detection sensor comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.
57. The remote gas density relay system of claim 1, wherein: after the gas density relay is verified, the intelligent processor automatically generates a verification report of the gas density relay, and if the gas density relay is abnormal, the intelligent processor sends an alarm and uploads the alarm to a remote end or sends the alarm to a designated receiver.
58. The remote gas density relay system of claim 1, wherein: the gas density relay is connected with the intelligent processor, and/or the intelligent processor is connected with the gas density relay.
59. The remote gas density relay system of claim 1, wherein: at least two gas density monitoring devices are connected with the background monitoring terminal through a concentrator and a protocol converter in sequence; wherein, each gas density relay is respectively arranged on the gas chamber of the corresponding electrical equipment.
60. The remote gas density relay system of claim 59, wherein: the hub adopts an RS485 hub; the protocol converter adopts an IEC61850 or IEC104 protocol converter.
61. The remote gas density relay system of claim 1, wherein: the online checking system comprises at least two gas density relays, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online checking contact signal sampling units, an intelligent processor and a gas density detection sensor, and is used for completing online checking of the gas density relays; or,
the online checking system comprises at least two gas density relays, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online checking contact signal sampling units, at least two intelligent processors and a gas density detection sensor, and is used for completing online checking of the gas density relays; or,
the on-line checking system comprises at least two gas density relays, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, at least two gas density detection sensors and an intelligent processor, and is used for completing the on-line checking of the gas density relays.
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| CN201921457425.XU CN210668207U (en) | 2019-09-04 | 2019-09-04 | Remote gas density relay system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110491724A (en) * | 2019-09-04 | 2019-11-22 | 上海乐研电气有限公司 | A kind of teletransmission gas density relay system and its method of calibration |
| CN112254870A (en) * | 2020-09-30 | 2021-01-22 | 武汉德塞仪器仪表科技有限公司 | High-precision gas micro-differential pressure gauge |
| CN115048329A (en) * | 2022-06-30 | 2022-09-13 | 航天南洋（浙江）科技有限公司 | Digital transmitter based on POWERBUS technology |
-
2019
- 2019-09-04 CN CN201921457425.XU patent/CN210668207U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110491724A (en) * | 2019-09-04 | 2019-11-22 | 上海乐研电气有限公司 | A kind of teletransmission gas density relay system and its method of calibration |
| CN110491724B (en) * | 2019-09-04 | 2024-07-23 | 上海乐研电气有限公司 | Remote gas density relay system and verification method thereof |
| CN112254870A (en) * | 2020-09-30 | 2021-01-22 | 武汉德塞仪器仪表科技有限公司 | High-precision gas micro-differential pressure gauge |
| CN112254870B (en) * | 2020-09-30 | 2022-07-05 | 武汉德塞仪器仪表科技有限公司 | High-precision gas micro-differential pressure gauge |
| CN115048329A (en) * | 2022-06-30 | 2022-09-13 | 航天南洋（浙江）科技有限公司 | Digital transmitter based on POWERBUS technology |
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