CN110416022B - Multifunctional gas density relay - Google Patents
Multifunctional gas density relay Download PDFInfo
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- CN110416022B CN110416022B CN201910830224.8A CN201910830224A CN110416022B CN 110416022 B CN110416022 B CN 110416022B CN 201910830224 A CN201910830224 A CN 201910830224A CN 110416022 B CN110416022 B CN 110416022B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
- G01N9/266—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences for determining gas density
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/32—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by bellows
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/36—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by curled flexible tube, e.g. Bourdon tube
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Abstract
The application provides a multifunctional gas density relay which comprises a shell, a base, a pressure detector, a temperature compensation element, at least one signal generator, an equipment connecting joint and an on-line checking joint signal sampling unit, wherein the base, the pressure detector, the temperature compensation element, the at least one signal generator and the equipment connecting joint are arranged in the shell, the on-line checking joint signal sampling unit is connected with the signal generator and is used for sampling joint signals generated when the multifunctional gas density relay is in joint action at the ambient temperature. The on-line checking contact signal sampling unit is relatively isolated from the contacts of the multifunctional gas density relay in a circuit in a non-checking state; and in the verification state, the contact signal control loop is cut off, so that the contact signal of the multifunctional gas density relay is ensured not to be uploaded, and the safe operation of a power grid is not influenced.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a multifunctional gas density relay applied to high-voltage and medium-voltage electrical equipment.
Background
The gas density relay is generally used for monitoring and controlling the density of insulating gas in high-voltage and medium-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 and medium-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 safe operation protection of the electrical equipment is realized.
At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to the power departments and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the development of economy and high speed, the capacity of the power system in China is rapidly enlarged, and the use amount of SF6 electrical equipment is increased. The SF6 gas has the functions of arc extinction and insulation in high-voltage electrical equipment, and the density reduction and micro water content of the SF6 gas in the high-voltage electrical equipment seriously affect the safe operation of the SF6 high-voltage electrical equipment if exceeding the standards: 1) The reduction of SF6 gas density to a certain extent will lead to a loss of insulation and arc extinction properties. 2) Under the participation of some metal matters, SF6 gas can be hydrolyzed with water at a high temperature of more than 200 ℃ to generate active HF and SOF 2, corrode insulating parts and metal parts, and generate a large amount of heat so as to raise the pressure of the air chamber. 3) At reduced temperatures, excessive moisture may form condensation water, significantly reducing the insulation strength of the insulator surface and even flashover, causing serious damage. The grid operating regulations therefore mandate that the density and water content of SF6 gas must be periodically checked both before and during operation of the plant.
With the development of unmanned substations to networking and digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the on-line monitoring of the gas density and micro water content states of SF6 electrical equipment has important practical significance. Along with the continuous and vigorous development of the intelligent power grid in China, the intelligent high-voltage electric equipment is used as an important component and a key node of an intelligent substation, and plays a role in the safety of the intelligent power grid. High-voltage electrical equipment is currently mostly SF6 gas insulation equipment, and if the gas density is reduced (such as caused by leakage, etc.), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation. Currently, on-line monitoring of gas density values in SF6 high voltage electrical equipment is very popular, and existing gas density monitoring systems (devices) are basically: 1) The remote SF6 gas density relay is used for collecting density, pressure and temperature, uploading and on-line monitoring of gas density. 2) The gas density transmitter is used for realizing the acquisition, uploading and on-line monitoring of the density, the pressure and the temperature of the gas. SF6 gas density relay is a core and key component. However, because the field operation environment of the high-voltage transformer substation is bad, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (device), the remote SF6 gas density relay consists of a mechanical density relay and an electronic remote transmission part; in addition, in the power grid system using the gas density transmitter, the traditional mechanical density relay is reserved. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and when the pressure reaches the alarm, locking or overpressure state, information is transmitted to a target equipment terminal through a contact connection circuit in time, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be timely transmitted to target equipment (such as a computer terminal) to realize online monitoring.
The periodic inspection of the gas density relay on the SF6 electrical equipment is a necessary measure for preventing the gas density relay from happening and ensuring the safe and reliable operation of the SF6 electrical equipment; both the "procedure for preventive testing of electric power" and the "twenty-five major requirements for prevention of major accidents in electric power production" require periodic verification of the gas density relay. From the practical operation situation, 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 verification of the SF6 gas density relay is very important and popular in the power system at present, and various power supply companies, power plants and large factories and mines enterprises have been implemented. And power supply companies, power plants and large-scale factories and mining enterprises are required to be equipped with testers, equipment vehicles and SF6 gas with high value for completing the on-site verification and detection work of the gas density relay. The method comprises the steps of roughly calculating the power failure business loss during detection, wherein the annual allocated detection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the field check of the inspector is not in normal operation, potential safety hazards exist. Therefore, innovation is very necessary on the existing gas density relay, so that the gas density relay or a monitoring system formed by the gas density relay for realizing on-line monitoring of the gas density is also provided with the verification function of the gas density relay, and further the periodic verification work of the (mechanical) gas density relay is finished, maintenance personnel are not required to go to the site, the efficiency is greatly improved, and the cost is reduced. Meanwhile, the micro water value inside the air chamber of the electrical equipment can be accurately measured in the on-line self-checking gas density relay or a monitoring system consisting of the gas density relay.
Disclosure of Invention
The invention aims to provide a multifunctional gas density relay applied to high-voltage and medium-voltage electrical equipment, which is used for monitoring the gas density of the gas-insulated or arc-extinguishing electrical equipment, simultaneously completing the on-line verification of the gas density relay, improving the efficiency, reducing the operation and maintenance cost and guaranteeing the safe operation of a power grid.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A multi-functional gas density relay comprising: the device comprises a shell, a base, a pressure detector, a temperature compensation element, at least one signal generator, a device connecting joint and an on-line checking contact signal sampling unit, wherein the base, the pressure detector, the temperature compensation element, the at least one signal generator and the device connecting joint are arranged in the shell;
The on-line checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit; the first connecting circuit is connected with the contact point of the multifunctional gas density relay and the contact point signal control loop, and the second connecting circuit is connected with the contact point of the multifunctional gas density relay and the output end of the on-line check contact point signal sampling unit;
In a non-verification state, the contact is a normally open type density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in a verification state, the first connecting circuit is disconnected, the second connecting circuit is communicated, and the contact point of the gas density relay is connected with the output end of the on-line verification contact point signal sampling unit; or alternatively
In a non-verification state, the contact is a normally-closed density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in the verification state, the contact signal control loop is closed, the connection between the contact of the gas density relay and the contact signal control loop is disconnected, and the second connection circuit is communicated to connect the contact of the gas density relay with the output end of the on-line verification contact signal sampling unit;
Wherein the contact signal includes an alarm, and/or a latch.
Preferably, the signal generator comprises a micro switch or a magnetically assisted electrical contact, and the multifunctional gas density relay outputs the contact signal through the signal generator.
Preferably, the temperature compensation element employs a temperature compensation plate or a gas enclosed within a housing.
Preferably, the pressure detector comprises a barden tube or a bellows.
Preferably, the pressure detector is fixed to the base and communicates with the base.
Preferably, the on-line check contact signal sampling unit is arranged on the device connection joint, or on the shell, or in the shell.
Preferably, the multifunctional gas density relay further comprises a display mechanism, wherein the display mechanism comprises a machine core, a pointer and a dial, and the machine core is fixed in the shell; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and is arranged in front of the dial, and the pointer is combined with the dial to display a gas density value; and/or
The display mechanism comprises a digital device or a liquid crystal device with indication display.
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 keep 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-verification 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; in the verification state, the normally closed contact is opened, the normally open contact is closed, and the contact of the gas density relay is connected with the output end of the on-line verification contact signal sampling unit through the normally open contact.
More preferably, the first relay and the second relay are two independent relays or the same relay.
Preferably, the connection point of the on-line checking connection point signal sampling unit and the gas density relay is electrically and photoelectrically isolated.
Preferably, the second connection circuit comprises a photo coupler and a resistor, and the photo coupler comprises a light emitting diode and a phototransistor; the joints of the light emitting diode and the gas density relay are connected in series to form a closed loop; the emitter of the phototriode is grounded; the collector of the phototriode is connected with the output end of the on-line check joint signal sampling unit, and 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 light turns on the phototriode, and the collector electrode of the phototriode outputs low level;
when the contact is opened, the closed loop is opened, the light emitting diode does not emit light, the phototransistor is turned off, and the collector of the phototransistor outputs a high level.
Preferably, the second connection circuit includes a first photo coupler and a second photo coupler;
The light emitting diodes of the first photoelectric coupler and the light emitting diodes of the second photoelectric coupler are respectively connected in parallel through current limiting resistors, and are connected in series with the contact points of the gas density relay to form a closed loop after being connected in parallel, and the connection directions of the light emitting diodes of the first photoelectric coupler and the light emitting diodes of 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 connected with a power supply through a voltage dividing resistor, and 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 the output end of the online check contact signal sampling unit and is grounded through a resistor;
When the contact is closed, the 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 a high level; or the first photoelectric coupler is cut off, the second photoelectric coupler is conducted, and the emitter of the phototriode of the second photoelectric coupler outputs high level;
When the contact is opened, 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 level.
More preferably, the second connection circuit further includes a first zener diode group and a second zener diode group, the first zener diode group and the second zener diode group are connected in parallel to the contact signal control loop, and the connection directions of the first zener diode group and the second zener diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are formed by connecting one, two or more voltage stabilizing diodes in series.
Further, the first zener diode group comprises a first zener diode and a second zener diode which are connected in series, and the cathode of the first zener diode is connected with the anode of the second zener diode; the second zener diode group comprises a third zener diode and a fourth zener diode which are connected in series, and the positive electrode of the third zener diode is connected with the negative electrode of the fourth zener diode.
Preferably, the second connection circuit further comprises a first hall current sensor and a second hall current sensor, the 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 the contacts of the gas density relay are 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 connected with the output end of the on-line check contact signal sampling unit;
When the contact is closed, the 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.
Preferably, the second connection circuit includes: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;
The first silicon controlled rectifier and the third silicon controlled rectifier are connected in series, the second silicon controlled rectifier and the fourth silicon controlled rectifier are connected in series and then form a series-parallel closed loop with a series circuit formed by the first silicon controlled rectifier and the third silicon controlled rectifier, one end of a contact point of the gas density relay is electrically connected with a circuit between the first silicon controlled rectifier and the third silicon controlled rectifier through a circuit, and the other end of the contact point of the gas density relay is electrically connected with a circuit between the second silicon controlled rectifier and the fourth silicon controlled rectifier through a circuit.
More preferably, the cathode of the first silicon controlled rectifier is connected with the output end of the on-line check joint signal sampling unit, and the anode of the first silicon controlled rectifier is connected with the cathode of the third silicon controlled rectifier; the control electrodes of the first controllable silicon and the third controllable silicon are connected with the output end of the on-line check contact signal sampling unit; the cathode of the second silicon controlled rectifier is connected with the output end of the on-line check joint signal sampling unit, and the anode of the second silicon controlled rectifier is connected with the cathode of the fourth silicon controlled rectifier; and the control electrodes of the second controllable silicon and the fourth controllable silicon are connected with the output end of the on-line check contact signal sampling unit.
Preferably, the on-line checking contact signal sampling unit is provided with at least two independent sampling contacts, so that the checking of at least two contacts of the gas density relay can be automatically completed at the same time, and the contacts are continuously measured without changing the contacts or reselecting the contacts; wherein,
The contacts include, but are not limited to, one of an alarm contact, an alarm contact + a lockout 1 contact + a lockout 2 contact, an alarm contact + a lockout contact + an overpressure contact.
More preferably, the on-line checking contact signal sampling unit is provided with at least one independent sampling contact to complete on-line checking of the single contact density relay.
Preferably, the on-line checking contact signal sampling unit applies a voltage of not less than 24V to the contact action value or the switching value (the gas density value when the contact switches to the open-close state) of the multifunctional gas density relay, that is, when checking, a voltage of not less than 24V is applied between the corresponding terminals of the contact.
Preferably, the on-line check joint signal sampling unit further comprises an anti-interference component.
Preferably, the on-line checking joint signal sampling unit is further provided with a temperature protection device for components, and the temperature protection device is used for ensuring that the components reliably work at low temperature or high temperature environment temperature.
More preferably, the temperature protection device comprises a heater and/or a heat sink (e.g. a fan), the heater being turned on when the temperature is below a set point and the heat sink (e.g. a fan) being turned on when the temperature is above the set point.
Preferably, the multifunctional gas density relay directly comprises a pressure sensor and a temperature sensor, or comprises a density measurement sensor adopting quartz tuning fork technology; or a gas density transmitter employing a pressure sensor and a temperature sensor.
Preferably, the multifunctional gas density relay further comprises at least one pressure sensor, wherein the pressure sensor is communicated with the multifunctional gas density relay on a gas path and is used for collecting pressure values; and/or the multifunctional gas density relay further comprises at least one temperature sensor, and the temperature sensor is connected with the multifunctional gas density relay and used for collecting temperature values.
More preferably, the temperature sensor is provided on or in the housing of the multifunctional gas density relay, or outside the housing.
More preferably, at least one temperature sensor is disposed near or on or integrated into the temperature compensation element of the multifunctional gas density relay. Preferably, at least one temperature sensor is provided at an end of the multifunctional gas density relay near the temperature compensation element, the pressure sensor comprising a barden tube or a bellows.
More preferably, the pressure sensor and the temperature sensor are of an integrated structure; or the integrated structure formed by the pressure sensor and the temperature sensor has a remote transmission function, and remotely transmits the monitored pressure value, the monitored temperature value and/or the gas density value and/or the contact signal state of the remote multifunctional gas density relay.
More preferably, the multifunctional gas density relay comprises at least two pressure sensors, the pressure values acquired by the pressure sensors are compared, and mutual verification among the pressure sensors is completed.
More preferably, the multifunctional gas density relay comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification among the temperature sensors.
More preferably, the multi-functional gas density relay comprises at least one pressure sensor and at least one temperature sensor; the pressure values collected by the pressure sensors and the temperature values collected by the temperature sensors are arranged and combined randomly, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are traversed through all the arrangement combinations, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and each gas density value is compared to finish the mutual verification of each pressure sensor and each temperature sensor; or comparing the gas density values obtained by the pressure sensors and the temperature sensors with the comparison density value output signals output by the gas density relay to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors; 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.
More preferably, the multifunctional gas density relay further comprises an intelligent control unit, wherein the intelligent control unit is connected with the on-line checking joint signal sampling unit, the pressure sensor and/or the temperature sensor, and is used for acquiring pressure values and temperature values acquired by the pressure sensor and the temperature sensor when the multifunctional gas density relay is in joint action, converting the pressure values and the temperature values into pressure values corresponding to 20 ℃ according to gas pressure-temperature characteristics, namely gas density values, and completing on-line checking of the multifunctional gas density relay.
Preferably, the multifunctional gas density relay further comprises a pressure adjusting mechanism, a gas path of the pressure adjusting mechanism is communicated with the pressure detector of the gas density relay, and the pressure adjusting mechanism is configured to adjust the pressure of the gas path of the gas density relay to rise and fall so that the multifunctional gas density relay is subjected to contact action.
More preferably, the pressure regulating 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 change of the gas in the closed air chamber is caused by heating the heating element and/or refrigerating the refrigerating element, so that the pressure rise and fall of the multifunctional gas density relay are completed.
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 regulating mechanism is a cavity with one end open, and the other end of the cavity is communicated with a gas path of the multifunctional 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 component, 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 component drives the adjusting rod to drive the piston to move in the cavity.
More preferably, during verification, the pressure regulating mechanism is a closed air chamber, a piston is arranged in 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 closed air chamber through electromagnetic force.
More preferably, the pressure adjusting mechanism is an air bag with one end connected with the driving component, and the air bag is driven by the driving component to change the volume.
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 stretches and contracts under the drive of the driving component.
The driving component in the pressure regulating mechanism includes, but is not limited to, one of magnetic force, motor (variable frequency motor or stepping motor), reciprocating mechanism, carnot circulation mechanism, and pneumatic element.
More preferably, the pressure regulating mechanism is a bleed valve.
Further, the pressure regulating mechanism also includes a flow valve that controls the flow rate of the gas release.
Further, the air release valve is a solenoid valve or an electric valve, or other air release valves realized by an electric or air mode.
More preferably, the pressure regulating mechanism is a compressor.
More preferably, the pressure regulating mechanism is a pump. More preferably, the pump includes, but is not limited to, a pump for creating pressure, a booster pump, an electric air pump, or an electromagnetic air pump.
More preferably, the pressure regulating mechanism is sealed within a cavity or housing.
Preferably, the multifunctional gas density relay further comprises a valve, one end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with a gas path of the multifunctional gas density relay.
More preferably, the valve is an electrically operated valve.
More preferably, the valve is a solenoid valve.
Further, the valve is a permanent magnet type electromagnetic valve.
More preferably, the valve is a piezoelectric valve, or a temperature controlled valve, or a novel valve made of intelligent memory material and opened or closed by electric heating.
More preferably, the valve is closed or opened by bending or flattening the hose.
More preferably, the valve is sealed within a cavity or housing.
More preferably, pressure sensors are respectively arranged on two sides of the gas path of the valve; or pressure or density detectors are respectively arranged on two sides of the gas path of the valve.
More preferably, the valve, the base, and the pressure detector are connected together by a connecting pipe.
More preferably, the multifunctional gas density relay further comprises a multi-way joint, and the base of the multifunctional gas density relay and the pressure detector are arranged on the multi-way joint; or the equipment connecting joint and the valve of the multifunctional gas density relay are arranged on the multi-way joint; or the equipment connecting joint, the base and the valve of the multifunctional gas density relay are arranged on the multi-way joint.
Further, the multifunctional gas density relay further comprises a self-sealing valve, and the self-sealing valve is mounted on the multi-way joint.
Preferably, the multifunctional gas density relay further comprises a micro water sensor for on-line monitoring of gas micro water value.
Preferably, the multifunctional gas density relay further comprises a decomposition product sensor for on-line monitoring of gas decomposition products.
Preferably, the multifunctional gas density relay further comprises a communication module, and the multifunctional gas density relay realizes data remote transmission through the communication module.
More preferably, the communication mode of the communication module is wired or wireless.
Further, the wired communication mode comprises one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, hart, IIC, SPI, wire, a coaxial cable, a PLC power carrier and a cable.
Further, the wireless communication mode comprises one or more of a 5G/NB-IOT communication module (such as 5G, NB-IOT), 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar built-in sensor.
The electrical equipment comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environment-friendly gas electrical equipment or other insulating gas electrical equipment.
The multifunctional gas density relay comprises a bimetallic strip-compensated gas density relay, a gas-compensated gas density relay or a gas density relay with a mixed bimetallic strip and a gas-compensated gas; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; a gas density relay with pointer display, a digital display type gas density relay, and a gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relay, and the like.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
The utility model provides a multi-functional gas density relay, includes the casing, and locate base, pressure detector, temperature compensation element, at least one signal generator and the equipment attach fitting that is used for connecting electrical equipment in the casing, still include on-line check joint signal sampling unit, on-line check joint signal sampling unit with signal generator is connected for the contact signal that produces when taking place the contact action of multi-functional gas density relay under the sampling ambient temperature. The on-line checking contact signal sampling unit is relatively isolated from the contacts of the multifunctional gas density relay in a circuit in a non-checking state; and in the verification state, the contact signal control loop is cut off, so that the contact signal of the multifunctional gas density relay is ensured not to be uploaded, and the safe operation of a power grid is not influenced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a multi-functional gas density relay according to a first embodiment;
FIG. 2 is a schematic diagram of a multi-functional gas density relay according to a second embodiment;
FIG. 3 is a schematic diagram of a control circuit of a multi-functional gas density relay according to a third embodiment;
FIG. 4 is a schematic diagram of a multi-functional gas density relay according to a fourth embodiment;
FIG. 5 is a schematic diagram of a multi-functional gas density relay according to a fifth embodiment;
FIG. 6 is a schematic diagram of a multi-functional gas density relay according to a sixth embodiment;
FIG. 7 is a schematic diagram of a multi-functional gas density relay according to a seventh embodiment;
FIG. 8 is a schematic diagram of a multi-functional gas density relay according to an eighth embodiment;
fig. 9 is a schematic diagram of the structure of a multifunctional gas density relay according to a ninth embodiment;
FIG. 10 is a schematic diagram of a multi-functional gas density relay according to a tenth embodiment;
FIG. 11 is a schematic diagram of a multi-functional gas density relay according to an eleventh embodiment;
FIG. 12 is a schematic diagram of a multi-functional gas density relay of the twelfth embodiment;
FIG. 13 is a schematic diagram of a multi-functional gas density relay of the thirteenth embodiment;
FIG. 14 is a schematic diagram of a control circuit of a fourteenth embodiment;
FIG. 15 is a schematic diagram of a control circuit of fifteen embodiments;
FIG. 16 is a schematic diagram of a control circuit of a sixteenth embodiment;
FIG. 17 is a schematic diagram of a control circuit of seventeenth embodiment;
Fig. 18 is a schematic diagram of a control circuit according to an eighteenth embodiment.
Detailed Description
The invention provides a multifunctional gas density relay, which is further described in detail below with reference to the accompanying drawings and examples in order to make the purposes, technical schemes and effects of the invention clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Embodiment one:
Fig. 1 is a schematic structural diagram of a multifunctional gas density relay according to an embodiment of the present invention. As shown in fig. 1, a multifunctional gas density relay 1 comprises a housing 101, 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 and a device connection joint 1010, wherein the base 102, the end seat 108, the pressure detector 103, the temperature compensation element 104, the movement 105, the pointer 106, the dial 107 and the device connection joint 1010 are arranged in the housing 101. The gas density relay 1 is communicated with an electrical device through the device connection joint 1010, 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, a cross beam is arranged at the other end of the temperature compensation element 104, and an adjusting piece for pushing the signal generator 109 and enabling the contact of the signal generator 109 to be connected or disconnected is arranged on the cross beam. 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 of the machine 105 and is provided in front of the dial 107, the pointer 106 displaying a gas density value in conjunction with the dial 107. The gas density relay 1 may also comprise a digital device or a liquid crystal device with an indication display.
The gas density relay 1 further includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is communicated with the equipment connecting joint 1010, and the other end of the valve 4 is communicated with the base 102; the pressure sensor 2 is communicated with the pressure detector 103 on the air path; the pressure regulating mechanism 5 is communicated with the pressure detector 103; the valve 4 is connected with an intelligent control unit 7; the pressure regulating mechanism 5 is connected with the intelligent control unit 7; the on-line checking contact signal sampling unit 6 is respectively connected with the signal generator 109 and the intelligent control unit 7, and is used for monitoring the contact state of the multifunctional gas density relay 1, and sending the monitored contact state information (including an action state and a non-action state) to the intelligent control unit 7.
Wherein, one end of the pressure detector 103 and one end of the temperature compensation element 104 are both fixed on the end seat 108, the other end of the pressure detector 103 is connected on the base 102, the other end of the temperature compensation element 104 is connected with the movement 105 through a display connecting rod or the other end of the temperature compensation element 104 is directly connected with the movement 105, and the pointer 106 is mounted on the movement 105 and arranged in front of the dial 107. The signal generator 109 may employ a micro switch or a magnetically assisted electrical contact, and the contact signal of the gas density relay is output through the signal generator 109. The pressure detector 103 may employ a barden tube or a bellows. The temperature compensation element 104 may employ a compensation plate or a gas enclosed within a housing. The multifunctional gas density relay of the present invention may further include: oil-filled type density relay, oil-free type density relay, gas density gauge, gas density switch or gas pressure gauge.
In this embodiment, the pressure detector 103 is based on and the temperature compensation element 104 is used to correct the changing pressure and temperature to reflect the change in (sulfur hexafluoride) gas density. Under the pressure of the measured medium (sulfur hexafluoride) gas, the temperature compensation element 104 is used, when the density value of the sulfur hexafluoride gas changes, the pressure value of the sulfur hexafluoride gas correspondingly changes, the tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation displacement is transmitted to the movement 105 by the aid of the temperature compensation element 104, the movement 105 is further transmitted to the pointer 106, the measured density value of the sulfur hexafluoride gas is indicated on the dial 107, and the signal generator 109 serves as an output alarm locking joint. Thus the gas density relay 1 can display the (sulfur hexafluoride) gas density value. If the gas leakage occurs, the density value of sulfur hexafluoride gas is reduced, the pressure detector 103 generates corresponding reverse displacement, the reverse displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is further transmitted to the pointer 106, the pointer 106 moves towards the direction with small indication value, the gas leakage degree is specifically displayed on the dial 107, and the signal generator 109 outputs (alarm locking) a contact signal to monitor and control the density of sulfur hexafluoride gas in the electric switch and other equipment, so that the electric equipment can safely work. The valve 4 may be various, and a shut-off valve such as a ball valve, a butterfly valve, a gate valve, a shut-off valve, a plug valve, a butterfly valve, a needle valve, a diaphragm valve, or the like may be employed. If the valve is a ball valve, the self-sealing valve core can be rotated to drive the ball valve to close the air passage of the switch equipment, and the valve can be flexibly designed according to actual needs. The valve 4 is automatic, or may be manually, semi-manually checked.
Embodiment two:
fig. 2 is a schematic diagram of a structure of a multifunctional gas density relay. As shown in fig. 2, in addition to the housing 101, and the base 102, the end seat 108, the pressure detector 103, the temperature compensation element 104, the plurality of signal generators 109, the movement 105, the pointer 106, the dial 107, and the device connection joint 1010 provided in the housing 101, the device connection joint further includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9 and an air supplementing interface 10. The valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the air supplementing port 10 are arranged on the multi-way joint 9. Specifically, the air inlet of the valve 4 is provided with an interface communicated with electrical equipment, the air inlet of the valve is connected to the electrical equipment in a sealing way and is communicated with an air chamber of the electrical equipment, and the air outlet of the valve 4 is communicated with a pressure detector through a multi-way joint 9; the pressure sensor 2 is communicated with a pressure detector on a gas path through a multi-way joint 9; the pressure regulating mechanism 5 is communicated with the pressure detector through a multi-way joint 9; the on-line checking contact signal sampling unit 6 is respectively connected with the signal generator and the intelligent control unit 7; the valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7; the air supplementing interface 10 is communicated with the multi-way joint 9.
Wherein, multi-functional gas density relay 1 includes: a bimetal-compensated gas density relay, a gas-compensated gas density relay, or a bimetal and gas-compensated mixed gas density relay; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; density relay with indication (density relay with pointer display, or density relay with digital display, density relay with liquid crystal display), density relay without indication (i.e. density switch); SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relay, and the like.
Type of pressure sensor 2: the absolute pressure sensor, the relative pressure sensor, or the absolute pressure sensor and the relative pressure sensor 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 type pressure sensor, a coil induction pressure sensor (such as a pressure measurement sensor with an induction coil attached to a Bardon tube), and a resistance pressure sensor (such as a pressure measurement sensor with a sliding wire resistance attached to a Bardon tube), and can be an analog quantity pressure sensor or a digital quantity pressure sensor. The pressure acquisition is a pressure sensor, a pressure transducer, or other various pressure sensing elements, such as diffused silicon, sapphire, piezoelectric, strain gauge (resistive strain gauge, ceramic strain gauge).
The temperature sensor 3 may be: thermocouple, thermistor, semiconductor type; both contact and non-contact; and may be a thermal resistor and a thermocouple. In short, various temperature sensing elements such as a temperature sensor and a temperature transmitter can be used for temperature acquisition.
The control of the valve 4 can adopt various transmission modes, such as manual operation, electric operation, hydraulic operation, pneumatic operation, turbine operation, electromagnetic hydraulic operation, electro-hydraulic operation, pneumatic operation, spur gear, bevel gear drive and the like; the valve can be operated according to preset requirements 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 enable the opening and closing piece to do lifting, sliding, swinging or rotating movement by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve is changed to realize the control function of the valve. The valves 4 may be of the automatic valve type, the power driven valve type and the manual valve type in a driving manner. 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) drive. The valve 4 may be automatic or manual or semi-automatic. The verification process can be automatically completed or semi-automatically completed by manual cooperation. The valve 4 is directly or indirectly connected with the electrical equipment through a self-sealing valve, a manual valve or a non-dismantling valve, and is integrated or separated. The valve 4 may be of a normally open type, a normally closed type, a unidirectional type, or a bidirectional type, as required. In short, the gas circuit is opened or closed by the electric control valve. The electric control valve adopts the following modes: solenoid valves, electrically controlled ball valves, electrically controlled proportional valves, and the like.
The pressure regulating mechanism 5 of this embodiment is one end open-ended cavity, there is the piston 51 in the cavity, the piston 51 is equipped with sealing washer 510, the one end of piston 51 is connected with a regulation pole, the outer end of regulation pole is connected with drive part 52, the other end of piston 51 stretches into in the opening, and with the inner wall of cavity contacts, drive part 52 drive the regulation pole and then drive piston 51 removes in the cavity. The drive component 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepper motor), a reciprocating mechanism, a Carnot cycle mechanism, a pneumatic element.
The basic requirements or functions of the intelligent control unit 7 are: control of the valve 4, control of the pressure regulating mechanism 5 and signal acquisition are accomplished by means of the intelligent control unit 7. The realization is as follows: the pressure value and the temperature value at the time of the contact operation can be detected and converted into the corresponding pressure value P 20 (density value) at 20 ℃. Or the density value P D20 when the contact point acts can be directly detected, and the verification work of the gas density relay is completed.
Of course, the intelligent control unit 7 may also implement: completing test data storage; and/or test data derivation; and/or the test data is printable; and/or can carry out data communication with an upper computer; and/or analog quantity, digital quantity information may be entered. The intelligent control unit 7 further comprises a communication module, and the communication module is used for realizing remote transmission of information such as test data and/or verification results; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the rated pressure value verification of the gas density relay 1 is completed.
Electrical equipment, including SF6 gas electrical equipment, SF6 gas mixture electrical equipment, environmental protection gas electrical equipment, or other insulating gas electrical equipment. Specifically, the electrical devices include GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas tanks, ring main units, and the like.
The multifunctional gas density relay has the functions of pressure and temperature measurement and software conversion. On the premise of not affecting the safe operation of the electrical equipment, the action value and/or the return value of the alarm and/or the locking contact can be detected on line. Of course, the return value of the alarm and/or lockout contact signals may also be tested as desired.
Embodiment III:
Fig. 3 is a schematic diagram of a control circuit of a multifunctional gas density relay. As shown in fig. 3, the on-line checking contact signal sampling unit 6 of the present embodiment is provided with a protection circuit, and includes a first connection circuit and a second connection circuit, the first connection circuit connects the contact (signal generator) 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 control unit 7, and in a non-checking state, the second connection circuit is opened, and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit 6 cuts off the first connection circuit, communicates with the second connection circuit, and connects the contact of the gas density relay 1 with the intelligent control unit 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 joints J11 and J12, and the normally closed joints J11 and J12 are connected in series in the joint signal control loop; the second relay J2 is provided with normally open joints J21 and J22, and the normally open joints J21 and J22 are connected to a joint P J of the gas density relay 1; the first relay J1 and the second relay J2 may be integrated, that is, a relay having normally open and normally closed contacts. In a non-verification state, the normally-closed joints J11 and J12 are closed, the normally-open joints J21 and J22 are opened, and the gas density relay monitors the output state of the joint P J in real time; in the verification state, the normally closed junctions J11 and J12 are opened, the normally open junctions J21 and J22 are closed, and the junction P J of the gas density relay 1 is connected with the intelligent control unit 7 through the normally open junctions J21 and J22.
The intelligent control unit 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, MCU, FPGA, PLC, etc., an industrial motherboard, an embedded main control board, etc., and other intelligent integrated circuits. The power source 72 (U2) may be a switching power supply, an ac 220V, a dc power supply, an LDO, a programmable power supply, solar power, a secondary battery, a rechargeable battery, a battery, or the like. The pressure sensor 2 for the pressure acquisition P may be various pressure sensitive elements such as a pressure sensor and a pressure transmitter. The temperature sensor 3 for temperature acquisition T may be various temperature sensing elements such as a temperature sensor and a temperature transmitter. The valve 4 may be a solenoid valve, an electric valve, a pneumatic valve, a ball valve, a needle valve, a regulating valve, a shutter, etc. that can open and close the gas path, or even control the flow. Semi-automatic may also be a manual valve. The pressure regulating mechanism 5 may be an electric regulating piston, an electric regulating cylinder, a booster pump, gas cylinder pressurization, a valve, a solenoid valve, a flow controller, or the like. The pressure adjustment mechanism may also be semi-automatic or manually adjustable.
The working principle of the first embodiment is as follows:
The intelligent control unit 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 a corresponding 20 ℃ pressure value P 20 (namely a gas density value). When the gas density relay 1 needs to be checked, if the gas density value P 20 is more than or equal to the set safety check density value P S, the intelligent control unit 7 controls the valve 4 to be closed, so that the gas density relay 1 is isolated from electrical equipment on a gas path.
Then, the intelligent control unit 7 controls to disconnect the contact signal control loop of the gas density relay 1, namely, the normally closed contacts J11 and J12 of the first relay J1 of the on-line checking contact signal sampling unit 6 are disconnected, so that the safety operation of the electrical equipment is not affected when the gas density relay 1 is checked on line, and an alarm signal is not sent out by mistake or the control loop is locked when the gas density relay 1 is checked on line. Because the monitoring and judgment of the safety check density value P S set at or above the gas density value P 20 is already performed before the start of the check, the gas leakage of the electrical equipment is a slow process within the safety operation range, and the check is safe. Meanwhile, the normally open contacts J21 and J22 of the second relay J2 of the on-line checking contact signal sampling unit 6 are closed, and at the moment, the contact P J of the gas density relay 1 is connected with the intelligent control unit 7 through the normally open contacts J21 and J22 of the second relay J2.
Then, the intelligent control unit 7 controls the driving part 52 (which can be mainly realized by adopting a motor and a gear, and the mode is various and flexible) of the pressure regulating mechanism 5, so that the volume change of the pressure regulating mechanism 5 is regulated, the pressure of the gas density relay 1 is gradually reduced, the gas density relay 1 generates a contact signal action, the contact signal action is uploaded to the intelligent control unit 7 through the second relay J2 of the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the measured pressure value P and the temperature T value into a pressure value P 20 (density value) corresponding to 20 ℃ according to the gas characteristic, and then the contact action value P D20 of the gas density relay can be detected. After all the contact signal action values of the alarm and/or locking signals of the gas density relay 1 are detected, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure regulating mechanism 5, the pressure regulating mechanism 5 is regulated, the pressure of the gas density relay 1 is gradually increased, and the return value of the alarm and/or locking contact signals of the gas density relay 1 is tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay is completed.
After the verification is completed, the normally open contacts J21 and J22 of the second relay J2 of the on-line verification contact signal sampling unit 6 are disconnected, and at this time, the contact P J of the gas density relay 1 is disconnected from the intelligent control unit 7 by disconnecting the normally open contacts J21 and J22 of the second relay J2. The intelligent control unit 7 controls the valve 4 to be opened so that the gas density relay 1 is communicated with the electrical equipment on the gas path. Then, normally closed contacts J11 and J12 of a first relay J1 of the on-line checking contact signal sampling unit 6 are closed, a 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. Thus, the on-line checking work of the gas density relay is conveniently completed, and the safe operation of the electrical equipment is not influenced.
When the multifunctional gas density relay completes the verification work, judgment is carried out, and the detection result can be reported. The mode is flexible, and specifically can: 1) The display can be performed on site, for example, by an indicator light, a digital code, a liquid crystal or the like; 2) Or uploading is implemented in an online remote communication mode, for example, the method can be uploaded to a background monitoring terminal; 3) Or uploading to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) Or uploaded by another route; 5) Or uploading the abnormal result through an alarm signal line or a special signal line; 6) Alone or in combination with other signal bundles. In short, after the multifunctional gas density relay completes the online checking work, if the multifunctional gas density relay is abnormal, an alarm can be automatically sent out, and the alarm can be uploaded to a far end or can be sent to a designated receiver, such as a mobile phone. Or after the verification work is finished, if the verification work is abnormal, the intelligent control unit 7 can upload remote ends (a monitoring room, a background monitoring platform and the like) through alarm contact signals of the gas density relay 1, and can also display notices on site. And the simple online verification can upload the result with the abnormality in 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 the alarm signal contact, and the alarm signal contact is regularly closed and opened, so that the situation can be obtained through analysis; or uploaded through a separate verification signal line. The method can be used for uploading states well or problems, uploading the verification result through a single verification signal line, displaying the verification result on site, alarming the verification result on site or uploading the verification result through wireless uploading, and uploading the verification result on a network with a smart phone. The communication mode is wired or wireless, and the wired communication mode CAN be RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, hart, IIC, SPI, wire, coaxial cable, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module (such as NB-IOT) built in a sensor, and the like. In a word, the reliability of the multifunctional gas density relay can be fully ensured by multiple modes and multiple combinations.
The multifunctional gas density relay has a safety protection function, namely when the gas density relay is lower than a set value, the multifunctional gas density relay automatically does not perform on-line 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 smaller than the set value P S, the verification is not performed; only when the gas density value is more than or equal to (alarm pressure value +0.02MPa), the on-line verification can be performed.
The multifunctional gas density relay can perform on-line verification according to set time, and also can perform on-line verification according to set temperature (such as limit high temperature, limit low temperature, normal temperature, 20 ℃ and the like). When the high temperature, low temperature, normal temperature and 20 ℃ environment temperature are checked online, the error judgment requirements are different, for example, when the 20 ℃ environment temperature is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and the accuracy requirement can be 2.5 level at high temperature. And can be implemented according to the related standard according to the temperature requirement. For example, according to the specification of 4.8 temperature compensation performances in DL/T259 sulfur hexafluoride gas density relay calibration regulations, the precision requirement corresponding to each temperature value is required.
The multifunctional gas density relay can compare error performance at different temperatures and different time periods. That is, the comparison in the same temperature range at different times determines the performance of the gas density relay 1 and the electrical equipment, and the comparison in each time of the history and the comparison in the history with the present are performed.
The multifunctional gas density relay can be repeatedly checked for a plurality of times (for example, 2-3 times), and the average value of the multifunctional gas density relay is calculated according to the checking result of each time. If necessary, the gas density relay 1 can be checked online at any time.
When the multifunctional gas density relay finishes the verification, mutual comparison judgment can be automatically carried out, and if the error phase difference is large, an abnormal prompt can be sent out: gas density relays or pressure sensors and temperature sensors have problems. The multifunctional gas density relay can complete the mutual calibration function of the gas density relay and the pressure sensor, the temperature sensor or the density transmitter, and has the artificial intelligent calibration capability; after the verification work is finished, a verification report can be automatically generated, if the verification report is abnormal, an alarm can be automatically sent out, or the verification report can be sent to a designated receiver, for example, a mobile phone; the gas density value and the verification result are displayed on site, or the gas density value and the verification result are displayed through a background, so that 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 inquiry, 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 system has a self-diagnosis function, and can timely notify abnormality, such as disconnection, short-circuit alarm, sensor damage and the like; the comparison of the error performance of the gas density relay can be made according to different time periods at different temperatures. That is, the performance of the gas density relay is determined by comparison in the same temperature range at different periods. The comparison of each period of the history and the comparison of the history and the current. The gas density value, the gas density relay 1, the pressure sensor 2 and the temperature sensor 3 of the electrical equipment can be judged, analyzed and compared normally and abnormally; the system also comprises an analysis system (expert management analysis system) for detecting, analyzing and judging the gas density value, the gas density relay and the monitoring element and knowing where the problem point is; the contact signal state of the gas density relay 1 is also monitored, and the state is remotely transmitted. The state of the contact signal of the gas density relay 1 can be known to be open or closed in the background, so that one more layer of monitoring is performed, 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 of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are consistent and normal, the gas density relay can be indicated to be normal, thus the gas density relay can be not required to be checked, other devices can not be checked, and the whole service life can be free from checking. Unless the test data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of one electrical device in the transformer substation are inconsistent and abnormal, maintenance personnel are not scheduled to process. 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.
Embodiment four:
As shown in fig. 4, the multifunctional gas density relay, in addition to a housing 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, and a device connection joint 1010 provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7.
The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint 1010, and the air outlet of the valve 4 is communicated with the base of the gas density relay 1 and the pressure detector. The pressure sensor 2, the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged on or in the shell of the gas density relay 1, and the pressure sensor 2 is communicated with the pressure detector of the gas density relay 1 on a gas path; the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1; the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent unit 7.
The pressure is regulated by the pressure regulating mechanism 5, so that the signal generator of the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the gas density value when the gas density relay 1 generates contact action into a corresponding gas density value according to the pressure value and the temperature value, and the alarming and/or locking contact signal action value and/or return value of the gas density relay are detected, so that the checking work of the gas density relay is completed. Or only detecting the alarm and/or locking contact action value to complete the checking work of the gas density relay.
Fifth embodiment:
As shown in fig. 5, the fourth embodiment is added with the air supply port 10 and the self-sealing valve 11. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing way, and the other end of the self-sealing valve 11 is communicated with the air inlet of the valve 4 and the air supplementing connector 10 through a connecting pipe.
Example six:
As shown in fig. 6, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010, which are provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the base of the gas density relay 1, the pressure sensor 2 and the pressure regulating mechanism 5. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are arranged at the rear side of the shell of the gas density relay 1. The on-line checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the electric equipment connecting joint. The pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path through a base of the gas density relay 1; the pressure regulating mechanism 5 communicates with the pressure detector of the gas density relay 1. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7. Unlike the first embodiment, the pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjustment mechanism 5 are provided at the rear side of the housing of the gas density relay 1.
Embodiment seven:
As shown in fig. 7, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010, which are provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, the air outlet of the valve 4 is communicated with a connecting pipe, the connecting pipe is communicated with a pressure detector of the gas density relay 1, and the pressure sensor 2 and the pressure regulating mechanism 5 are also communicated with the connecting pipe, so that the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the pressure detector are communicated on an air circuit. The gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent control unit 7 are arranged in a shell; the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected with the intelligent control unit 7; the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7.
Example eight:
as shown in fig. 8, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010, which are provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. The gas density relay 1, the temperature sensor 3, the on-line check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on the gas path; the pressure regulating mechanism 5 is in communication with the pressure detector of the gas density relay 1 on the gas path. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7.
In contrast to the second embodiment, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 53 and a driving member 52. The pressure adjusting mechanism 5 is controlled by the intelligent control unit 7, so that the driving part 52 pushes the air bag 53 to change the volume, and the pressure is lifted.
Example nine:
As shown in fig. 9, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010, which are provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7 and a multi-way joint 9. The air inlet of the valve 4 is connected with the equipment connecting joint in a sealing way, and the air outlet of the valve 4 is connected with the multi-way joint 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 is arranged on the multi-way joint 9, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path; the pressure regulating mechanism 5 is arranged on the multi-way joint 9, and the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1; the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together and are arranged on the multi-way joint 9; the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7.
The difference from the second embodiment is that: the pressure adjusting mechanism 5 of the present embodiment is mainly composed of a bellows 54, a driving member 52. The bellows 54 is connected with the pressure detector of the gas density relay 1 in a sealing way to form a reliable sealing cavity. The pressure regulating mechanism 5 is controlled by the intelligent control unit 7, so that the driving part 52 pushes the corrugated pipe 54 to change the volume, and the sealing cavity changes the volume, thereby completing the lifting of the pressure. The pressure is regulated by the pressure regulating mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the pressure value and the temperature value of the gas density relay 1 when the contact action is performed into corresponding density values according to the pressure value and the temperature value, and the alarm and/or the locking contact action value and/or the return value of the gas density relay 1 are detected, so that the checking work of the gas density relay 1 is completed.
Example ten:
As shown in fig. 10, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010, which are provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. 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 a pressure detector of the gas density relay 1 on a gas path. The pressure regulating mechanism 5 is in communication with a pressure detector of the gas density relay 1. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.
In contrast to the second exemplary embodiment, the valve 4 is sealed inside the first housing 41, and the control cable of the valve 4 is led out via a first lead-out seal 42 sealed to the first housing 41, which ensures that the valve 4 remains sealed and can be operated reliably for a long period of time. The pressure regulating mechanism 5 is sealed inside the second shell 55, and a control cable of the pressure regulating mechanism 5 is led out through a second lead-out wire sealing piece 56 sealed with the second shell 55, so that the pressure regulating mechanism 5 is designed to keep sealed, and can reliably work for a long time. The second housing 55 and the first housing 41 may be integrated.
Example eleven:
As shown in fig. 11, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010 provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, the air outlet of the valve 4 is connected with the pressure regulating mechanism 5, and the pressure sensor 2 is arranged on the pressure regulating mechanism 5. The temperature sensor 3, the on-line checking joint signal sampling unit 6, the intelligent control unit 7 and the gas density relay 1 are arranged on the pressure regulating mechanism 5. The pressure detector of the gas density relay 1, the pressure sensor 2, the pressure regulating mechanism 5 and the valve 4 are communicated on a gas path. The temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.
Embodiment twelve:
As shown in fig. 12, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010, which are provided in the housing 101, further comprises: the intelligent control system comprises a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure regulating mechanism 5. The gas density relay 1, the first temperature sensor 31, the on-line check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together and on the pressure regulating mechanism 5; the first pressure sensor 21 is provided on the pressure adjusting mechanism 5. 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 is connected. The first pressure sensor 21 and the pressure detector of the gas density relay 1 are communicated with the pressure regulating mechanism 5 on the 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 control unit 7; the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.
Unlike the second embodiment, the two pressure sensors are respectively 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 second temperature sensor 32 may be omitted in this embodiment. The embodiment is provided with a plurality of pressure sensors and temperature sensors, and the pressure values obtained by monitoring the pressure sensors can be compared and checked with each other; the temperature values obtained by the temperature sensors can be compared and checked with each other; the plurality of pressure sensors and the plurality of temperature sensors can be compared with each other and checked with each other to obtain a plurality of corresponding gas density values.
Embodiment thirteen:
As shown in fig. 13, a multifunctional gas density relay, in addition to a housing 101, 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, and a device connection joint 1010 provided in the housing 101, further comprises: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7 and a multi-way joint 9. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way, and the air outlet of the valve 4 is connected with the multi-way joint 9. The valve 4 is sealed inside the first housing 41, and the control cable of the valve 4 is led out through the first lead-out wire sealing member 42 sealed with the first housing 41, so that the design ensures that the valve 4 keeps sealed, and can reliably work for a long time. The gas density relay 1 is arranged on the multi-way joint 9; the pressure regulating mechanism 5 is mounted on the multi-way joint 9. The pressure sensor 2, the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay 1. The pressure sensor 2 and the gas density relay 1 are communicated with the pressure regulating mechanism 5 on the gas path. The valve 4, the pressure regulating mechanism 5, the pressure sensor 2 and the temperature sensor 3 are respectively connected with the intelligent control unit 7.
Unlike the second embodiment, the following is: the pressure sensor 2, the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay 1. The pressure regulating mechanism 5 of the present embodiment is mainly composed of an air chamber 57, a heating element 58, and a heat insulating member 59. The air chamber 57 is externally (or internally) provided with a heating element 58, which, by heating, causes a temperature change and thus a pressure rise or fall. The pressure is regulated by the pressure regulating mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the pressure value and the temperature value of the gas density relay 1 when the contact action is performed into corresponding density values according to the pressure value and the temperature value, and the alarming and/or locking contact action value and/or the return value of the gas density relay are detected, so that the checking work of the gas density relay is completed.
The working principle of the embodiment is as follows: when the density relay needs to be checked, the intelligent control unit 7 controls the heating element 58 of the pressure regulating mechanism 5 to heat, and when the temperature difference between the temperature value T510 in the pressure regulating mechanism 5 and the temperature value T of the temperature sensor 3 reaches a set value, the valve 4 can be closed through the intelligent control unit 7, so that the gas density relay is separated from electrical equipment on a gas path; then immediately turning off the heating element 58 of the adjusting mechanism 5, stopping heating the heating element 58, gradually reducing the pressure of the gas in the closed gas chamber 57 of the pressure adjusting mechanism 5, so that the gas density relay 1 generates alarm and/or locking contact points to act respectively, transmitting the contact point actions to the intelligent control unit 7 through the on-line checking contact point signal sampling unit 6, and detecting the alarm and/or locking contact point action value and/or return value of the gas density relay by the intelligent control unit 7 according to the density value when the alarm and/or locking contact points act, thereby completing the checking work of the gas density relay.
Fourteen examples:
As shown in fig. 14, the on-line check contact signal sampling unit 6 of the present embodiment includes a photo coupler OC1 and a resistor R1, where the photo coupler OC1 includes a light emitting diode and a phototransistor; the anode of the light emitting diode and the contact P J of the gas density relay 1 are connected in series to form a closed loop; the emitter of the phototriode is grounded; the collector of the phototriode is used as an output end out6 of the on-line check joint signal sampling unit 6 to be connected with the intelligent control unit 7, and the collector of the phototriode is also connected with a power supply through the resistor R1.
By the above circuit, it is possible to easily know whether the contact P J of the gas density relay 1 is open (non-operating state) or closed (operating state). Specifically, when the contact P J is closed, the closed loop is electrified, the light emitting diode emits light, the light turns on the phototransistor, and the collector electrode of the phototransistor outputs a low level; when the contact P J is opened, the closed loop is opened, the light emitting diode does not emit light, the phototransistor is turned off, and the collector of the phototransistor outputs a high level. In this way, the high-low level is output through the output terminal out6 of the on-line check contact signal sampling unit 6.
In this embodiment, the intelligent control unit 7 is isolated from the contact signal control circuit by a photoelectric isolation method, and the contact P J is closed in the verification process, or the contact P J is closed under the condition of air leakage, and at this time, the low level of the collector output of the phototransistor is detected. The time for closing the contact P J during the verification process is controlled to be a preset length, so that the length of the duration of the closing state of the contact P J during the verification process is determined under the condition of no air leakage, and whether the contact P J is closed during the verification process can be judged by monitoring the duration of the received low level. Therefore, the time can be recorded during verification, and the alarm signal during verification, rather than the alarm signal during air leakage, can be judged by the air density relay 1.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2).
Example fifteen:
as shown in fig. 15, the online check contact signal sampling unit 6 of the present embodiment includes a first photo coupler OC1 and a second photo coupler OC2.
The light emitting diodes of the first photoelectric coupler OC1 and the light emitting diodes of the second photoelectric coupler OC2 are respectively connected in parallel through current limiting resistors, and are connected in series with the contact points of the gas density relay to form a closed loop after being connected in parallel, and the connection directions of the light emitting diodes of the first photoelectric coupler OC1 and the light emitting diodes of 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 connected with a power supply through a voltage dividing 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 control unit 7 and grounded through a resistor R5.
By the above circuit, it is possible to easily know whether the contact P J of the gas density relay 1 is open (non-operating state) or closed (operating state). Specifically, when the contact P J is closed, the closed loop is electrified, the first photo coupler OC1 is turned on, the second photo coupler OC2 is turned off, and the emitter (i.e., the output end out 6) of the phototransistor of the first photo coupler OC1 outputs a 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 terminal out 6) of the phototransistor of the second photo-coupler OC2 outputs a high level. When the contact P J is opened, the closed loop is disconnected, the first and second photo-couplers OC1 and OC2 are turned off, and the emitters (i.e., the output terminal out 6) of the phototransistors of the first and second photo-couplers OC1 and OC2 output a low level.
In a preferred embodiment, the circuit further comprises a first zener diode group and a second zener diode group, the first zener diode group and the second zener diode group are connected in parallel on the contact signal control loop, and the connection directions of the first zener diode group and the second zener diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are formed by connecting one, two or more 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 positive electrode of the third zener diode D3 is connected with the negative electrode of the fourth zener diode D4.
The circuit can conveniently monitor the state of the contact P J of the gas density relay 1, and is combined with the intelligent control unit 7 to correspondingly process whether the contact P J is in an open state or in a closed state, remote transmission is implemented, the state of a contact signal is known from the background, and the reliability of a power grid is greatly improved.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2).
Example sixteen:
as shown in fig. 16, this embodiment differs from the fifteen embodiment in that: the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display 75 (U5), a data storage 76 (U6) and the like.
The communication mode of the communication module 73 (U3) may be wired, such as an industrial BUS including RS232, RS485, CAN-BUS, etc., an optical fiber ethernet, 4-20mA, hart, IIC, SPI, wire, a coaxial cable, a PLC power carrier, etc.; or wireless, such as 2G/3G/4G/5G, etc., WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, sonar, etc. The intelligent control unit protection circuit 74 (U4) may be an anti-static interference circuit (e.g., ESD, EMI), an anti-surge circuit, an electrical fast protection circuit, an anti-rf field interference circuit, an anti-burst interference circuit, a power short protection circuit, a power reverse protection circuit, an electrical contact misconnection protection circuit, a charging protection circuit, etc. The intelligent control unit protection circuits can be one kind or a plurality of kinds of flexible combination. The display and output 75 (U5) may be a nixie tube, LED, LCD, HMI, a display, a matrix screen, a printer, a facsimile, a projector, a mobile phone, etc., and may be one kind or a combination of several kinds. The data storage 76 (U6) may be a flash memory card such as FLASH, RAM, ROM, a hard disk, SD, etc., a magnetic tape, a punched paper tape, an optical disk, a usb disk, a optical disk, a film, etc., and may be one kind or a combination of several kinds.
Example seventeenth:
As shown in fig. 17, the online check contact signal sampling unit 6 of the present embodiment includes a first hall current sensor H1 and a second hall current sensor H2, the first hall current sensor H1, the second hall current sensor H2, and a contact P J of the gas density relay are connected in series to form a closed loop, and a contact P J of the gas density relay 1 is connected between the first hall current sensor H1 and the second hall current sensor H2; the output end of the first Hall current sensor H1 and the output end of the second Hall current sensor H2 are connected with the intelligent control unit 7.
By the above circuit, it is possible to easily know whether the contact P J of the gas density relay 1 is open (non-operating state) or closed (operating state). Specifically, when the contact P J is closed, a closed loop is electrified, and a current flows between the first hall current-sensor H1 and the second hall current-sensor H2, so as to generate an induced potential; when the contact P J is opened, the closed loop is powered off, no current flows between the first hall current-sensor H1 and the second hall current-sensor H2, and the induced potential generated is zero.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display and output 75 (U5), a data storage 76 (U6), and the like.
Example eighteenth:
as shown in fig. 18, the on-line check contact signal sampling unit 6 of the present embodiment includes a first SCR1, a second SCR2, a third SCR3, and a fourth SCR4.
The first silicon controlled rectifier SCR1 is connected with the third silicon controlled rectifier SCR3 in series, and the second silicon controlled rectifier SCR2 and the fourth silicon controlled rectifier SCR4 are connected in series and then form a series-parallel closed loop with a series circuit formed by the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR 3; one end of a contact P J of the gas density relay 1 is electrically connected with a circuit between the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR3 through a circuit, and the other end is electrically connected with the circuit
The second silicon controlled rectifier SCR2 and the fourth silicon controlled rectifier SCR4 are electrically connected through a circuit. The series-parallel connection is a circuit in which the above-described components are connected in parallel and in series, as shown in fig. 6.
Specifically, the cathode of the first silicon controlled rectifier SCR1 is connected with the cathode of the second silicon controlled rectifier SCR2 to form the output end of the on-line checking contact signal sampling unit 6, and the output end is connected with the intelligent control unit 7; the anode of the first silicon controlled rectifier SCR1 is connected with the cathode of the third silicon controlled rectifier SCR 3; the anode of the second silicon controlled rectifier SCR2 is connected with the cathode of the fourth silicon controlled rectifier SCR 4; the anode of the third silicon controlled rectifier SCR3 and the anode of the fourth silicon controlled rectifier SCR4 are connected with the input end of the on-line check joint signal sampling unit 6. The control electrodes of the first silicon controlled rectifier SCR1, the second silicon controlled rectifier SCR2, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are all connected with the intelligent control unit 7. The intelligent control unit 7 can control the on or off of the corresponding silicon controlled rectifier.
The working procedure of this embodiment is as follows:
When the verification is not performed and the operation is normal, the contact P J is disconnected, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are triggered, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are in a conducting state, and the contact signal control loop is in a working state. At the moment, the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 are not triggered, and the cathodes of the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 are not subjected to voltage output and are in an off state. When verification is performed, the third SCR3 and the fourth SCR4 are not triggered, but the first SCR1 and the second SCR2 are triggered. At this time, the third SCR3 and the fourth SCR4 are in the off state, and the contact P J is isolated from the contact signal control loop. The first SCR1 and the second SCR2 are in a conductive state, and the contact P J is connected with the on-line verification contact signal sampling unit 6 and connected with the intelligent control unit 7. The on-line checking contact signal sampling unit 6 can also be formed by mixing a solid-state relay or an electromagnetic relay and a silicon controlled rectifier flexibly.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display and output 75 (U5), a data storage 76 (U6), and the like.
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.
Claims (36)
1. A multi-functional gas density relay, comprising: the device comprises a shell, a base, a pressure detector, a temperature compensation element, at least one signal generator, a device connecting joint and an on-line checking contact signal sampling unit, wherein the base, the pressure detector, the temperature compensation element, the at least one signal generator and the device connecting joint are arranged in the shell;
The on-line checking contact signal sampling unit is arranged on the equipment connecting joint, or on the shell, or in the shell, and comprises a first connecting circuit and a second connecting circuit; the first connecting circuit is connected with the contact point of the multifunctional gas density relay and the contact point signal control loop, and the second connecting circuit is connected with the contact point of the multifunctional gas density relay and the output end of the on-line check contact point signal sampling unit;
In a non-verification state, the contact is a normally open type density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in a verification state, the first connecting circuit is disconnected, the second connecting circuit is communicated, and the contact point of the gas density relay is connected with the output end of the on-line verification contact point signal sampling unit; or alternatively
In a non-verification state, the contact is a normally-closed density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in the verification state, the contact signal control loop is closed, the connection between the contact of the gas density relay and the contact signal control loop is disconnected, and the second connection circuit is communicated to connect the contact of the gas density relay with the output end of the on-line verification contact signal sampling unit;
wherein the contact signal includes an alarm and/or a latch.
2. A multi-functional gas density relay according to claim 1, wherein: the signal generator comprises a micro switch or a magnetic-assisted electric contact, and the multifunctional gas density relay outputs the contact signal through the signal generator; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell; the pressure detector comprises a bowden tube or a bellows.
3. A multi-functional gas density relay according to claim 1, wherein: the pressure detector is fixed on the base and is communicated with the base.
4. A multi-functional gas density relay according to claim 1, wherein: the multifunctional gas density relay further comprises a display mechanism, wherein the display mechanism comprises a machine core, a pointer and a dial, and the machine core is fixed in the shell; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and is arranged in front of the dial, and the pointer is combined with the dial to display a gas density value; and/or
The display mechanism comprises a digital device or a liquid crystal device with indication display.
5. A multi-functional gas density relay according to claim 1, 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 keep 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-verification 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; in the verification state, the normally closed contact is opened, the normally open contact is closed, and the contact of the gas density relay is connected with the output end of the on-line verification contact signal sampling unit through the normally open contact.
6. A multi-function gas density relay according to claim 5, wherein: the first relay and the second relay are two independent relays or the same relay.
7. A multi-functional gas density relay according to claim 1, wherein: the second connecting circuit comprises a photoelectric coupler and a resistor, wherein the photoelectric coupler comprises a light emitting diode and a phototriode; the joints of the light emitting diode and the gas density relay are connected in series to form a closed loop; the emitter of the phototriode is grounded; the collector of the phototriode is connected with the output end of the on-line check joint signal sampling unit, and 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 light turns on the phototriode, and the collector electrode of the phototriode outputs low level;
when the contact is opened, the closed loop is opened, the light emitting diode does not emit light, the phototransistor is turned off, and the collector of the phototransistor outputs a high level.
8. A multi-functional gas density relay according to claim 1, wherein: the second connection circuit comprises a first photoelectric coupler and a second photoelectric coupler;
The light emitting diodes of the first photoelectric coupler and the light emitting diodes of the second photoelectric coupler are respectively connected in parallel through current limiting resistors, and are connected in series with the contact points of the gas density relay to form a closed loop after being connected in parallel, and the connection directions of the light emitting diodes of the first photoelectric coupler and the light emitting diodes of 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 connected with a power supply through a voltage dividing resistor, and 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 the output end of the online check contact signal sampling unit and is grounded through a resistor;
When the contact is closed, the 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 a high level; or the first photoelectric coupler is cut off, the second photoelectric coupler is conducted, and the emitter of the phototriode of the second photoelectric coupler outputs high level;
When the contact is opened, 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 level.
9. A multi-function gas density relay according to claim 8, wherein: the second connecting circuit further comprises a first zener diode group and a second zener diode group, wherein the first zener diode group and the second zener diode group are connected in parallel on the contact signal control loop, and the connection directions of the first zener diode group and the second zener diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are formed by connecting one, two or more voltage stabilizing diodes in series.
10. A multi-function gas density relay according to claim 9, wherein: the first voltage stabilizing diode group comprises a first voltage stabilizing diode and a second voltage stabilizing diode which are connected in series, and the cathode of the first voltage stabilizing diode is connected with the anode of the second voltage stabilizing diode; the second zener diode group comprises a third zener diode and a fourth zener diode which are connected in series, and the positive electrode of the third zener diode is connected with the negative electrode of the fourth zener diode.
11. A multi-functional gas density relay according to claim 1, wherein: the second connecting circuit further comprises a first Hall current sensor and a second Hall current sensor, the 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 the contacts of the gas density relay are 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 connected with the output end of the on-line check contact signal sampling unit;
When the contact is closed, the 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.
12. A multi-functional gas density relay according to claim 1, wherein: the second connection circuit includes: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;
The first silicon controlled rectifier and the third silicon controlled rectifier are connected in series, the second silicon controlled rectifier and the fourth silicon controlled rectifier are connected in series and then form a series-parallel closed loop with a series circuit formed by the first silicon controlled rectifier and the third silicon controlled rectifier, one end of a contact point of the gas density relay is electrically connected with a circuit between the first silicon controlled rectifier and the third silicon controlled rectifier through a circuit, and the other end of the contact point of the gas density relay is electrically connected with a circuit between the second silicon controlled rectifier and the fourth silicon controlled rectifier through a circuit.
13. A multi-function gas density relay according to claim 12, wherein: the cathode of the first silicon controlled rectifier is connected with the output end of the on-line check joint signal sampling unit, and the anode of the first silicon controlled rectifier is connected with the cathode of the third silicon controlled rectifier; the control electrodes of the first controllable silicon and the third controllable silicon are connected with the output end of the on-line check contact signal sampling unit; the cathode of the second silicon controlled rectifier is connected with the output end of the on-line check joint signal sampling unit, and the anode of the second silicon controlled rectifier is connected with the cathode of the fourth silicon controlled rectifier; and the control electrodes of the second controllable silicon and the fourth controllable silicon are connected with the output end of the on-line check contact signal sampling unit.
14. A multi-functional gas density relay according to claim 1, wherein: the on-line checking contact signal sampling unit is provided with at least two independent sampling contacts, can automatically complete checking on at least two contacts of the gas density relay at the same time, and is used for continuous measurement without replacing the contacts or reselecting the contacts; wherein,
The contacts comprise one of an alarm contact, a locking contact, an alarm contact, a locking 1 contact, a locking 2 contact, an alarm contact, a locking contact and an overpressure contact.
15. A multi-functional gas density relay according to claim 1, wherein: and the on-line checking contact signal sampling unit applies a voltage not lower than 24V between corresponding terminals of the contacts when checking the test voltage of the contact action value or the switching value of the contact action value of the multifunctional gas density relay to be not lower than 24V.
16. A multi-functional gas density relay according to claim 1, wherein: the on-line checking joint signal sampling unit further comprises an anti-interference component.
17. A multi-functional gas density relay according to claim 1, wherein: the on-line checking joint signal sampling unit is also provided with a temperature protection device for the components and the components, and is used for ensuring the reliable operation of the components and the components at low temperature or high temperature environment temperature;
The temperature protection device comprises a heater and/or a radiator, wherein the heater is started when the temperature is lower than a set value, and the radiator is started when the temperature is higher than the set value.
18. A multi-functional gas density relay according to claim 1, wherein: the multifunctional gas density relay directly comprises a pressure sensor and a temperature sensor or comprises a density measurement sensor adopting a quartz tuning fork technology; or a gas density transmitter employing a pressure sensor and a temperature sensor.
19. A multi-functional gas density relay according to claim 1, wherein: the multifunctional gas density relay further comprises at least one pressure sensor, wherein the pressure sensor is communicated with the multifunctional gas density relay on a gas path and is used for collecting pressure values; and/or the number of the groups of groups,
The multifunctional gas density relay further comprises at least one temperature sensor, and the temperature sensor is connected with the multifunctional gas density relay and used for collecting temperature values.
20. A multi-function gas density relay according to claim 19, wherein: the temperature sensor is arranged on or in the shell of the multifunctional gas density relay or outside the shell.
21. A multi-function gas density relay according to claim 19, wherein: at least one temperature sensor is disposed near or on or integrated into the temperature compensation element of the multi-function gas density relay.
22. A multi-function gas density relay according to claim 21, wherein: at least one temperature sensor is disposed at an end of the pressure detector of the gas density relay adjacent to the temperature compensation element.
23. A multi-function gas density relay according to claim 19, wherein: the pressure sensor and the temperature sensor are of an integrated structure.
24. A multi-function gas density relay as defined in claim 23, wherein: the integrated structure formed by the pressure sensor and the temperature sensor has a remote transmission function, and remotely transmits the monitored pressure value, temperature value and/or gas density value and/or the joint signal state of the remote transmission multifunctional gas density relay.
25. A multi-function gas density relay according to claim 19, wherein: the multifunctional gas density relay comprises at least two pressure sensors, pressure values acquired by the pressure sensors are compared, and mutual verification among the pressure sensors is completed.
26. A multi-function gas density relay according to claim 19, wherein: the multifunctional gas density relay comprises at least two temperature sensors, temperature values acquired by the temperature sensors are compared, and mutual verification among the temperature sensors is completed.
27. A multi-function gas density relay according to claim 19, wherein: the multifunctional gas density relay comprises at least one pressure sensor and at least one temperature sensor; the pressure values collected by the pressure sensors and the temperature values collected by the temperature sensors are arranged and combined randomly, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are traversed through all the arrangement combinations, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and each gas density value is compared to finish the mutual verification of each pressure sensor and each temperature sensor; or comparing the gas density values obtained by the pressure sensors and the temperature sensors with the comparison density value output signals output by the gas density relay to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors; 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.
28. A multi-function gas density relay according to claim 19, wherein: the multifunctional gas density relay further comprises an intelligent control unit, wherein the intelligent control unit is connected with the on-line checking joint signal sampling unit, the pressure sensor and/or the temperature sensor and used for acquiring pressure values and temperature values acquired by the pressure sensor and the temperature sensor when the multifunctional gas density relay is in joint action, converting the pressure values and the temperature values into pressure values corresponding to 20 ℃ according to gas pressure-temperature characteristics, namely gas density values, and completing on-line checking of the multifunctional gas density relay.
29. A multi-functional gas density relay according to claim 1, wherein: the multifunctional gas density relay further comprises a pressure adjusting mechanism, a gas path of the pressure adjusting mechanism is communicated with a pressure detector of the gas density relay, and the pressure adjusting mechanism is configured to adjust the pressure of the gas path of the gas density relay to rise and fall so that the multifunctional gas density relay is contacted.
30. A multi-functional gas density relay according to claim 1, wherein: the multifunctional gas density relay also comprises a valve, one end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with a gas path of the multifunctional gas density relay.
31. A multi-function gas density relay according to claim 30, wherein: the valve, the base and the pressure detector are connected together by a connecting tube.
32. A multi-function gas density relay according to claim 30, wherein: the multifunctional gas density relay further comprises a multi-way joint, and a base and a pressure detector of the multifunctional gas density relay are arranged on the multi-way joint; or the equipment connecting joint and the valve of the multifunctional gas density relay are arranged on the multi-way joint; or the equipment connection joint, the base and the valve of the multifunctional gas density relay are arranged on the multi-way joint.
33. A multi-function gas density relay according to claim 32, wherein: the multifunctional gas density relay further comprises a self-sealing valve, and the self-sealing valve is installed on the multi-way joint.
34. A multi-functional gas density relay according to claim 1, wherein: the multifunctional gas density relay further comprises a micro-water sensor for monitoring the micro-water value of the gas on line; and/or, the multifunctional gas density relay further comprises a decomposition product sensor for on-line monitoring of gas decomposition products.
35. A multi-functional gas density relay according to claim 1, wherein: the multifunctional gas density relay further comprises a communication module, and the multifunctional gas density relay realizes data remote transmission through the communication module.
36. A multi-function gas density relay according to claim 35, wherein: the communication mode of the communication module is a wired communication mode or a wireless communication mode.
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| CN111397791A (en) * | 2019-01-03 | 2020-07-10 | 华润微电子（重庆）有限公司 | Pressure detection and display alarm chip and system |
| CN110411892B (en) * | 2019-09-04 | 2024-07-23 | 上海乐研电气有限公司 | Contact signal acquisition circuit for on-site on-line checking gas density relay |
| CN112269125A (en) * | 2020-10-21 | 2021-01-26 | 中广核核电运营有限公司 | Pressure switch on-line checking method |
| CN115575283B (en) * | 2022-09-30 | 2024-03-26 | 南京凤嘉科技有限公司 | Control circuit of SF6 gas density meter |
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