CN211426165U - Gas density relay with online self-checking function and monitoring device - Google Patents
Gas density relay with online self-checking function and monitoring device Download PDFInfo
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Abstract
The application provides a gas density relay and monitoring devices with online self-checking function for high pressure and medium voltage electrical equipment, including gas density relay body, gas density detection sensor, lead to joint, temperature regulation mechanism, online check-up contact signal sampling unit and intelligence accuse unit more. Control the unit through the intelligence to temperature regulation mechanism, make the temperature of gas density relay rise, and then the temperature of the temperature compensation component of density relay rises, make the gas density relay body take place the contact action, the contact action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, density value when the intelligence is controlled the unit and is moved according to the contact, detect out the contact signal action value and/or the return value of gas density relay body, accomplish gas density relay's check-up work, need not overhaul personnel to the scene just can accomplish gas density relay's check-up work, the reliability of electric wire netting is greatly improved, the efficiency is improved, the cost is reduced.
Description
Technical Field
The utility model relates to an electric power tech field, concretely relates to use on high pressure, middling pressure electrical equipment, have on line from gas density relay and monitoring devices of check-up function.
Background
At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal objects, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF2, corrode insulating parts and metal parts, and generate a large amount of heat to increase the pressure of a gas chamber. 3) When the temperature is reduced, excessive moisture may form condensed water, so that the surface insulation strength of the insulation part is remarkably reduced, and even flashover occurs, thereby causing serious harm. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.
With the development of the unattended transformer substation towards networking and digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring method has important practical significance on the gas density and micro-water content state of SF6 electrical equipment. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. At present, the online monitoring of the gas density value in the SF6 high-voltage electrical equipment is very common, and therefore, the application of the gas density monitoring system (gas density relay) is developed vigorously. Whereas current gas density monitoring systems (gas density relays) are basically: 1) the remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. 2) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. The SF6 gas density relay is the core and key component. However, because the environment for the field operation of the high-voltage substation is severe, especially the electromagnetic interference is very strong, in the currently used gas density monitoring system (gas density relay), the remote transmission type SF6 gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and can transmit information to a target equipment terminal through a contact connecting circuit in time when pressure reaches an alarm, locking or overpressure state, 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 transmitted to target equipment (generally a computer terminal) in time to realize online monitoring.
The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment. The 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and then the regular checking work of the (mechanical) gas density relay is completed, no maintenance personnel is needed to arrive at the site, the working efficiency is greatly improved, and the cost is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas density relay and monitoring devices with online self-checking function to solve the problem that provides in the above-mentioned technical background.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the first aspect of the present application provides a gas density relay with an online self-checking function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a multi-way joint, a temperature adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the gas path of the gas density relay body is connected with the first interface of the multi-way connector;
the temperature adjusting mechanism is a temperature-adjustable adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body so as to enable the gas density relay body to generate contact signal action;
the online check contact signal sampling unit is directly or indirectly connected with the gas density relay body and is configured to sample a contact signal generated when a contact of the gas density relay body acts;
the intelligent control unit is respectively connected with the gas density detection sensor, the temperature adjusting mechanism and the online check contact signal sampling unit, and is configured to complete control of the temperature adjusting mechanism, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
The second aspect of the present application provides a gas density monitoring device with an online self-calibration function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a multi-way joint, a temperature adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the gas path of the gas density relay body is connected with the first interface of the multi-way connector;
the temperature adjusting mechanism is a temperature-adjustable adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body so as to enable the gas density relay body to generate contact signal action;
the online check contact signal sampling unit is directly or indirectly connected with the gas density relay body and is configured to sample a contact signal generated when a contact of the gas density relay body acts;
the intelligent control unit is respectively connected with the gas density detection sensor, the temperature adjusting mechanism and the online check contact signal sampling unit, and is configured to complete control of the temperature adjusting mechanism, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
Preferably, the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or the temperature adjusting mechanism is arranged inside the gas density relay body; or the temperature adjusting mechanism is arranged outside the gas density relay body; or the gas density detection sensor, the temperature adjusting mechanism, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or the multi-way joint is arranged on the gas density relay body; or the temperature adjusting mechanism is arranged on the multi-way joint; or the temperature adjusting mechanism and the gas density detection sensor are arranged on the multi-way joint; or, online check joint signal sampling unit with the unit setting is controlled to the intelligence is in on the many logical joint.
Preferably, the gas density relay body and the gas density detection sensor are of an integrated structure; or the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
Preferably, the gas density detection sensor is of an integrated structure; or, the gas density detection sensor is a gas density transmitter with an integrated structure.
More preferably, online check joint signal sampling unit, the intelligence accuse unit sets up on the gas density transmitter.
Preferably, the online check joint signal sampling unit and the intelligent control unit are arranged together.
More preferably, the online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
Preferably, the gas density detection sensor includes a pressure sensor and a temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density detection sensor using quartz tuning fork technology.
More preferably, the pressure sensor is mounted on an air path of the gas density relay body.
More preferably, the temperature sensor is installed on or outside the gas path of the gas density relay body, or inside the gas density relay body, or outside the gas density relay body.
More preferably, the gas density detection sensor includes at least one pressure sensor, at least one temperature sensor.
Specifically, the pressure sensor may be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor; can be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (such as a pressure sensor with an induction coil of a Badon tube), a resistance pressure sensor (such as a pressure sensor with a slide wire resistor of a Badon tube); the pressure sensor can be an analog quantity pressure sensor or a digital quantity pressure sensor;
the temperature sensor can be a thermocouple, a thermistor or a semiconductor type; contact and non-contact can be realized; can be thermal resistance and thermocouple; may be digital or analog.
More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor, and/or an absolute pressure sensor.
Further, when the pressure sensor is an absolute pressure sensor, the absolute pressure value is used for representing the pressure sensor, the calibration result is the corresponding absolute pressure value at 20 ℃, the relative pressure value is used for representing the calibration result, and the calibration result is converted into the corresponding relative pressure value at 20 ℃; when the pressure sensor is a relative pressure sensor, the relative pressure value is used for representing, the verification result is the corresponding relative pressure value at 20 ℃, the absolute pressure value is used for representing, and the verification result is converted into the corresponding absolute pressure value at 20 ℃; the conversion relation between the absolute pressure value and the relative pressure value is as follows:
Pabsolute pressure＝PRelative pressure+PStandard atmospheric pressure。
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to gas density, accomplish promptly the on-line monitoring of gas density relay to the electrical equipment who monitors.
More preferably, the intelligent control unit calculates the gas density value by using an average method (averaging method), wherein the average method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in the whole temperature range to obtain a gas density value; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in the whole pressure variation range to obtain a gas density value; wherein N is a positive integer greater than or equal to 1.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, so as to complete online verification of the gas density relay; or,
the intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay's online check-up.
Preferably, the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; or, the gas density relay body has the comparison pressure value output signal, should compare pressure value output signal with the intelligence is controlled the unit and is connected.
Preferably, the gas density relay body includes, but is not limited to, a bimetal compensated gas density relay, a gas compensated gas density relay, a bimetal and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
Preferably, the temperature adjustment mechanism is a heating element; or the temperature regulating mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature regulating mechanism shell; alternatively, the temperature adjustment mechanism comprises a heating element and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature adjusting mechanism comprises a heating element, a temperature controller and a temperature detector; or, the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or the temperature adjusting mechanism is a micro constant temperature box; the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors; the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.
More preferably, the heating elements in the temperature regulating mechanism comprise at least two heating elements with the same or different powers; or comprise a heating element with adjustable heating power.
More preferably, the arrangement positions of at least two heating elements can be the same or different, and can be reasonably arranged according to needs.
More preferably, the temperature adjusting mechanism is controlled in a multi-stage manner.
Preferably, the temperature regulating mechanism is controlled by the intelligent control unit, when the action value of the contact signal of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second when the action value is approached (or the requirement is set according to the requirement), namely the temperature requirement is steadily increased or decreased.
Preferably, the gas density relay with an online self-checking function further comprises: one end of the valve is provided with a connecting port communicated with electrical equipment and communicated with the electrical equipment, and the other end of the valve is communicated with the gas density relay body; or a connecting port communicated with the electrical equipment is arranged at one end of the valve, and the other end of the valve is communicated with the pressure adjusting mechanism and the gas density relay body.
More preferably, the valve is further connected with the intelligent control unit, and the valve is closed or opened under the control of the intelligent control unit.
More preferably, the pressure sensor is mounted on an air path of the gas density relay body, or an air path of the multi-way joint, or a connecting pipe between the pressure adjusting mechanism and the multi-way joint, or a connecting pipe between the gas density relay body and the multi-way joint, or a connecting pipe between the valve and the multi-way joint.
More preferably, the electrical equipment comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment.
Specifically, the electrical equipment comprises a GIS, a GIL, a PASS, a circuit breaker, a current transformer, a voltage transformer, a transformer, an inflatable cabinet and a ring main unit.
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 control valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
More preferably, the valve is closed or opened in a hose bending or flattening mode.
More preferably, the valve is sealed within a chamber or housing.
More preferably, the valve and the pressure regulating mechanism are sealed within a single chamber or housing.
More preferably, pressure sensors are respectively arranged on two sides of the air path of the valve.
More preferably, the front end of the valve is provided with a gas density relay body or a density switch.
More preferably, the valve is embedded in the multi-way joint. Specifically, the multi-way joint is provided with a third interface, the third interface is provided with a connecting part butted with the electrical equipment, and the valve is embedded in the connecting part.
More preferably, the gas density relay with an online self-checking function further comprises: the self-sealing valve is arranged between the multi-way joint and the valve; or the valve is arranged between the multi-way joint and the self-sealing valve.
Preferably, the gas density relay with an online self-checking function further comprises: the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas density relay body, and then the gas density relay body is matched with or/and combined with the temperature regulating mechanism to generate contact signal action; the intelligent control unit is connected with the pressure adjusting mechanism to complete the control of the pressure adjusting mechanism; alternatively, the gas density relay further comprises: the intelligent control unit is connected with the heating device; or, gas density relay still includes air chamber and heating device, the air chamber with the gas density relay body is linked together, the outside or the inside of air chamber are equipped with the heating device, the intelligence control unit with the heating device is connected.
More preferably, the pressure regulating mechanism is sealed within a chamber or housing.
More preferably, during verification, the pressure adjusting mechanism is a closed gas chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed gas chamber, and heating by the heating element and/or refrigeration by the refrigerating element result in temperature change of gas in the closed gas chamber, so that pressure rise and pressure fall of the 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 adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with the multi-way joint; the cavity is internally provided with a piston, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod and then drives the piston to move in the cavity.
More preferably, during verification, the pressure adjusting mechanism is a closed air chamber, a piston is arranged inside the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving component is arranged outside the closed air chamber, and the driving component pushes the piston to move in the cavity through electromagnetic force.
More preferably, the pressure adjustment mechanism is an air bag having one end connected to a driving member, the air bag is driven by the driving member to generate a volume change, and the air bag is communicated with the multi-way joint.
More preferably, the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the multi-way joint, and the other end of the corrugated pipe stretches under the driving of the driving part.
The driving component of the pressure adjusting mechanism includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepping motor), a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.
More preferably, the pressure regulating mechanism is a purge valve.
Further, the pressure regulating mechanism further comprises a flow valve for controlling the gas release flow.
Further, the air release valve is an electromagnetic valve or an electric valve, or other air release valves realized by electric or pneumatic means.
More preferably, the pressure regulating mechanism is a compressor.
More preferably, the pressure regulating mechanism is a pump.
Further, the pump includes, but is not limited to, one of a pressurizing pump, an electric air pump, and an electromagnetic air pump.
Preferably, the intelligent control unit realizes maintenance-free of the gas density relay by comparing data detected by the mutual self-calibration unit; or the intelligent control unit and the mutual self-correction unit are used for comparing the detected data, so that the maintenance-free gas density relay is realized.
Preferably, the intelligent control unit further comprises a depth calculation unit, and the depth calculation unit can provide an air source with proper initial density for the gas density relay to be verified according to an environmental temperature value, a gas density value or a pressure value of the electrical equipment and a gas pressure-temperature characteristic; or, the intelligence is controlled the unit according to the ambient temperature value when the check-up, the gas pressure value of electrical equipment air chamber the temperature value that gas density relay needs the check-up, according to gas pressure-temperature characteristic, can be for required check-up gas density relay provides the suitable air supply of initial density of a check-up.
Preferably, the online verification contact signal sampling unit samples the contact signal of the gas density relay body to satisfy the following conditions: the online check joint signal sampling unit is provided with at least one group of independent sampling joints, can automatically complete check on at least one joint simultaneously, and continuously measures without changing the joint or reselecting the joint; wherein,
the contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.
Preferably, the online verification contact signal sampling unit is used for testing the contact signal action value or the switching value of the contact signal action value of the gas density relay body to be not lower than 24V, namely, during verification, the voltage of not lower than 24V is applied between corresponding terminals of the contact signal.
Preferably, the intelligent control unit automatically controls the whole verification process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic and input and output.
More preferably, the intelligent control unit automatically controls the whole verification process based on embedded algorithms and control programs such as a general-purpose computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC and the like, an industrial control main board, an embedded main control board and the like, and includes all peripherals, logics, input and output.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or input of analog quantity and digital quantity information.
More preferably, the gas density relay (or monitoring device) supports the input of basic information of the gas density relay, wherein the basic information comprises, but is not limited to, one or more of factory number, precision requirement, rated parameter, manufacturing plant and operation position.
Preferably, the intelligent control unit further comprises a communication module for transmitting the test data and/or the verification result in a long distance.
More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.
Further, the wired communication mode includes, but is not limited to, 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 includes, but is not limited to, one or more of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication and sonar.
Preferably, a clock is further arranged on the intelligent control unit, and the clock is configured to be used for regularly setting the verification time of the gas density relay, or recording the test time, or recording the event time.
Preferably, the control of the intelligent control unit is controlled through a field control and/or a background control.
More preferably, the gas density relay with the online self-checking function completes online checking of the gas density relay according to the setting or the instruction of the background; or,
and completing the online verification of the gas density relay according to the set verification time of the gas density relay.
Preferably, the gas density relay with an online self-checking function further comprises: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current verification data in real time and/or supports data input.
Preferably, the gas density relay with an online self-checking function further comprises: and the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit.
More preferably, the gas density relay with an online self-checking function further includes: gas circulation mechanism, gas circulation mechanism respectively with the gas density relay body with the unit is connected is controlled to the intelligence, gas circulation mechanism includes capillary, sealed cavity and heating element.
Further, the micro water sensor can be installed in a sealed chamber of the gas circulation mechanism, in a capillary, at a capillary port, and outside the capillary.
Preferably, the gas density relay with an online self-checking function further comprises: and the decomposition substance sensor is respectively connected with the gas density relay body and the intelligent control unit.
Preferably, the gas density relay with the online self-checking function further comprises a camera for monitoring.
Preferably, the gas density relay with the online self-checking function further comprises a gas supplementing interface.
More preferably, the air supply interface is arranged on the pressure regulating mechanism; or the air supply interface is arranged on the electrical equipment; or the air supply interface is arranged on the multi-way joint; or the air supply interface is arranged on the self-sealing valve.
Preferably, the gas density relay body includes: the device comprises a shell, a base, a pressure detector, a temperature compensation element and at least one signal generator, wherein the base, the pressure detector, the temperature compensation element and the at least one signal generator are arranged in the shell; the first interface of the multi-way joint is communicated with the base; the online check contact signal sampling unit is connected with the signal generator;
the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
More preferably, at least one of the temperature sensors is arranged near or on or integrated in a temperature compensation element of the gas density relay body. Preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay body, which is close to the temperature compensation element.
More preferably, the gas density relay body further comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or the display mechanism comprises a digital device or a liquid crystal device with a display of the value.
More preferably, the gas density relay body or the gas density monitoring device further includes a contact resistance detection unit; the contact resistance detection unit is connected with the contact point signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the density relay acts and/or receives an instruction of detecting the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.
More preferably, the gas density relay body or the gas density monitoring device further includes an insulation resistance detection unit; the insulation resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the density relay acts and/or receives an instruction of detecting the contact insulation resistance, the insulation resistance detecting unit can detect the contact insulation resistance value of the gas density relay.
Preferably, the online verification of the gas density relay is completed by at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two online verification contact signal sampling units, an intelligent control unit and a gas density detection sensor; or,
the online calibration method comprises the following steps that at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online calibration contact signal sampling units, at least two intelligent control units and a gas density detection sensor are used for completing online calibration of the gas density relay; or,
at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, at least two gas density detection sensors and an intelligent control unit are used for completing the on-line checking of the gas density relay.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
the application provides a gas density relay and monitoring devices with online self-checking function for high pressure, middling pressure electrical equipment, including gas density relay body, gas density detection sensor, lead to joint, temperature regulation mechanism, online check-up contact signal sampling unit and intelligence accuse unit more. Temperature through temperature adjustment mechanism regulation density relay's temperature compensation component goes up and down for the action of contact takes place for gas density relay body, the contact action is transmitted to intelligence through online check-up contact signal sampling unit and is controlled the unit, intelligence is controlled the density value when unit is moved according to the contact, detect out warning and/or shutting contact signal action value and/or the return value of gas density relay body, need not install density relay check-up valve additional, need not maintainer just can accomplish gas density to the sceneThe relay is checked, so that the reliability of a power grid is improved, the efficiency is improved, the cost is reduced, and the maintenance-free gas density relay can be realized. Meanwhile, SF is realized in the whole verification process of the application6Zero emission of gas and meeting the requirements of environmental protection regulations.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a gas density relay with an online self-checking function according to a first embodiment;
fig. 2 is a schematic structural view of a gas density relay body according to a preferred embodiment of the present application;
FIG. 3 is a schematic structural diagram of a gas density relay with an online self-checking function according to a second embodiment;
FIG. 4 is a schematic structural diagram of a gas density relay with an online self-calibration function according to a third embodiment;
FIG. 5 is a schematic structural diagram of a gas density relay with an online self-checking function according to a fourth embodiment;
FIG. 6 is a schematic structural diagram of a gas density relay with an online self-checking function according to a fifth embodiment;
fig. 7 is a schematic structural diagram of a gas density relay with an online self-checking function according to a sixth embodiment.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1, the first embodiment of the present invention provides a gas density relay or gas density monitoring device with an online self-calibration function, including: gas density relay body 1, pressure sensor 2, temperature sensor 3, temperature adjustment mechanism 5, online check-up contact signal sampling unit 6, an intelligent control unit 7, many logical joint 9 and tonifying qi interface 10. The temperature adjusting mechanism 5 is arranged opposite to the gas density relay body 1, and the temperature sensor 3 is arranged in a shell of the density relay body 1. Gas density relay body 1 and tonifying qi interface 10 set up on many lead to joint 9, and pressure sensor 2, online check-up contact signal sampling unit 6 and intelligence are controlled unit 7 and are set up on density relay body 1. The temperature adjustment mechanism 5 is provided outside the density relay body 1. Specifically, the density relay body 1 is communicated with the electrical equipment 8 through a multi-way connector 9; the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path; the online check contact signal sampling unit 6 is respectively connected with the gas density relay body 1 and the intelligent control unit 7; the pressure sensor 2, the temperature sensor 3 and the temperature adjusting mechanism 5 are respectively connected with an intelligent control unit 7; the air supply interface 10 is communicated with the multi-way joint 9.
The temperature adjusting mechanism 5 is configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body 1, so that the gas density relay body 1 generates contact action; the online check contact signal sampling unit 6 is connected with the gas density relay body 1 and is configured to sample a contact signal of the gas density relay body 1; wherein the contact signal comprises an alarm and/or a latch; the temperature adjusting mechanism 5 mainly comprises a heating element 501, a heat preservation member 502, a controller 504, a temperature detector 3 (same as a temperature sensor), a temperature adjusting mechanism shell 503 and the like. The controller 504 may use PID control, or a combination of PID and fuzzy control. The range of power for the heating element 501 to electrically heat the work is controlled by the controller 504 and the temperature rise and fall range setting. The variation amplitude of the temperature is controlled by different power levels. The degree of deviation may be set to advance heating or cooling. The temperature in the temperature adjusting mechanism 5 is measured through the intelligent control unit 7 and the controller 504, and when the action value of the contact signal of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the action value is approached, or the requirement is set according to the requirement), namely the temperature requirement is stably increased or decreased.
The working principle is as follows:
through the operation or control of the intelligent control unit 7 on the temperature adjusting mechanism 5, the temperature of the gas density relay body 1 is increased, and then the temperature of the temperature compensation element of the density relay is increased, and the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the temperature is close to the action value, or the requirement is set according to the requirement), namely the temperature requirement is stably increased or decreased. Until the action of the contact takes place for gas density relay body 1, the contact action is transmitted to intelligent control unit 7 through online check contact signal sampling unit 6, and intelligent control unit 7 obtains gas density value according to pressure value, temperature value when the contact action, or directly obtains gas density value, detects out gas density relay's contact signal action value, accomplishes the check-up work of gas density relay's contact signal action value. For example, for a gas density relay with density relay parameters of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the ambient temperature is 5 ℃, the gas pressure of the gas chamber of the electrical equipment 8 is 0.5562MPa (relative pressure), at this time, in the verification system, the pressure value is unchanged, when the temperature rises to 29.5 ℃, the alarm contact thereof operates, the intelligent control unit 7 can obtain an alarm contact operating value 0.5317MPa (relative pressure) of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 29.5 ℃ when the contact operates, and the intelligent control unit 7 can obtain the error of the alarm contact operating value: and 0.0117MPa (0.5317MPa-0.52 MPa is 0.0117MPa), and the checking of the alarm contact action value of the density relay is completed.
The temperature of the gas density relay body 1 is reduced by operating or controlling the temperature adjusting mechanism 5 through the intelligent control unit 7, so that the temperature of a temperature compensation element of the density relay body 1 is reduced, the contact point resetting of the gas density relay is realized, the contact point resetting is transmitted to the intelligent control unit 7 through the online checking contact point signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to a pressure value and a temperature value when the contact point is reset, or directly obtains the gas density value, a contact point signal return value of the gas density relay is detected, and the checking work of the contact point signal return value of the gas density relay is completed; for example, for the gas density relay with the density relay parameter of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the ambient temperature is 5 ℃, the gas pressure in the electrical equipment 8 is 0.5562MPa (relative pressure), and also in the verification system at this time, the pressure value is unchanged, when the temperature is reduced to 24.8 ℃, the alarm contact is reset, the intelligent control unit 7 can obtain the return value 0.5435MPa (relative pressure) of the alarm contact of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 24.8 ℃ when the contact is reset, and the intelligent control unit 7 can obtain the switching difference of the alarm contact: and 0.0118MPa (0.5435-0.5317 MPa is 0.0118MPa), so that the action value of the alarm contact of the density relay is verified. The intelligent control unit 7 can determine the performance condition (such as pass or fail) of the verified gas density relay according to the requirement and the verification result (verification data).
After all the contact signal verification operations are completed, the heating element 501 of the temperature adjustment mechanism is turned off by a manual or intelligent control unit 7.
Wherein, gas density relay body 1 includes: a bimetallic strip compensated gas density relay, a gas compensated gas density relay, or a bimetallic strip and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; a density relay with indication (a density relay displayed by a pointer, a density relay displayed by a digital code, a density relay displayed by a liquid crystal) and a density relay without indication (namely a density switch); SF6 gas density relay, SF6 hybrid gas density relay, N2 gas density relay, other gas density relays, and the like.
Type of pressure sensor 2: absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, may be several in number. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).
The temperature sensor 3 may be: a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.
The temperature adjusting mechanism 5 is a heating element; or the temperature regulating mechanism mainly comprises a heating element, a heat preservation piece, a controller, a temperature detector, a temperature regulating mechanism shell and the like; or the temperature adjusting mechanism mainly comprises a heating element and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power adjuster and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a controller, a temperature detector and the like; or, the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or the temperature adjusting mechanism is a micro constant temperature box; the heating element comprises one of a resistance wire, an electrothermal alloy, an electrothermal belt, an electrothermal couple, an electrothermal rod, a hot air blower, an infrared heating device, a microwave heating device, an electromagnetic induction heating device, a semiconductor, an electrothermal wire, an electrothermal plate, an electrothermal cable, an electrothermal disc, an electric heating coil, an electric tracing belt, an electric heating core, a mica heating sheet, a ceramic heating sheet, a silicon carbon rod, an electrothermal wire and an electric mesh belt; the heating element consists of a plurality of heating element groups; the controller includes, but is not limited to, one of a PID controller, a PID and fuzzy controller combined controller, a variable frequency controller, and a PLC controller.
The online check contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification. When the contact signal of the gas density relay body 1 acts during the calibration, the safe operation of the electrical equipment cannot be influenced; 2) the contact signal control loop of the gas density relay body 1 does not influence the performance of the gas density relay, particularly does not influence the performance of the intelligent control unit 7, and does not cause the gas density relay to be damaged or influence the test work.
The basic requirements or functions of the intelligent control unit 7 are as follows: the intelligent control unit 7 is used for controlling the temperature adjusting mechanism 5 and acquiring signals. The realization is as follows: can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 acts, and convert the pressure value and temperature value into the corresponding pressure value P at 20 DEG C20(density value), that is, the contact operating value P of the gas density relay body 1 can be detectedD20And the calibration work of the gas density relay body 1 is completed. Alternatively, the density value P at the time of the contact signal operation of the gas density relay body 1 can be directly detectedD20And the calibration work of the gas density relay body 1 is completed.
Of course, the intelligent control unit 7 can also realize: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 7 further comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value output signal of gas density relay body 1, the density value at that time is gathered simultaneously to intelligence accuse unit 7, accomplishes the rated pressure value check-up of gas density relay body 1. Meanwhile, the self-checking work among the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay body 1, and the maintenance-free operation is realized.
Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas insulated cabinets, ring main units, and the like.
Gas density relay body 1, pressure sensor 2, temperature sensor 3, temperature adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7 and lead to and connect 9 between can suitably set up in a flexible way as required. For example, the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 may be provided together; or the density relay body 1 and the temperature adjusting mechanism 5 may be provided together. In short, the arrangement between them can be flexibly arranged and combined.
Fig. 2 is a schematic structural view of a gas density relay body 1 according to a preferred embodiment of the present application. As shown in fig. 2, a gas density relay body 1 includes: the temperature-compensating device comprises a shell 101, and a base 102, an end seat 108, a pressure detector 103, a temperature compensating element 104, a plurality of signal generators 109, a movement 105, a pointer 106 and a dial 107 which are arranged in the shell 101. One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, the other end of the temperature compensation element 104 is provided with a beam, and the beam is provided with an adjusting piece which pushes the signal generator 109 and enables a contact of the signal generator 109 to be switched on or off. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the core 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The gas density relay body 1 may further include a digital device or a liquid crystal device having an indication display. The signal generator 109 comprises a microswitch or a magnetic auxiliary electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 comprises a bourdon tube or a bellows; the temperature compensation element 104 is a temperature compensation sheet or a gas enclosed in a housing. The gas density relay body 1 of the present embodiment may further include: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge.
The first interface of the multi-way joint 9 is communicated with the base 102; a second interface of the multi-way joint 9 is communicated with the pressure sensor 2; and the online check joint signal sampling unit is 6 units and is connected with the signal generator 109.
In the gas density relay body 1 of the present embodiment, the varying pressure and temperature are corrected based on the pressure detector 103 and by the temperature compensation element 104 to reflect the variation in the sulfur hexafluoride gas density. Under the pressure of the measured medium sulfur hexafluoride (SF6), due to the action of the temperature compensation element 104, when the density value of the sulfur hexafluoride gas changes, the pressure value of the sulfur hexafluoride gas also changes correspondingly, so that the end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the displacement is transmitted to the movement 105 by means of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, and the density value of the sulfur hexafluoride gas to be measured is indicated on the dial 107. The signal generator 109 serves as an output alarm lockout contact. Therefore, the gas density relay body 1 can display the density value of the sulfur hexafluoride gas. If the sulfur hexafluoride gas density value is reduced due to air leakage, the pressure detector 103 generates corresponding downward displacement and transmits the downward displacement to the movement 105 through the temperature compensation element 104, the movement 105 transmits the downward displacement to the pointer 106, the pointer 106 moves towards the direction with small indication value, and the air leakage degree is specifically displayed on the dial 107; meanwhile, the pressure detector 103 drives the beam to move downwards through the temperature compensation element 104, the adjusting piece on the beam gradually leaves the signal generator 109, and when the adjusting piece on the beam reaches a certain degree, the contact of the signal generator 109 is connected to send out a corresponding contact signal (alarm or lock), so that the sulfur hexafluoride gas density in equipment such as an electrical switch and the like is monitored and controlled, and the electrical equipment can work safely.
If the gas density value is increased, namely the pressure value of sulfur hexafluoride gas in the sealed gas chamber is greater than the set pressure value of the sulfur hexafluoride gas, the pressure value is correspondingly increased, the tail end of the pressure detector 103 and the temperature compensation element 104 generate corresponding upward displacement, the temperature compensation element 104 enables the cross beam to also move upward, the adjusting piece on the cross beam moves upward and pushes the contact of the signal generator 109 to be disconnected, and the contact signal (alarm or lock) is released.
The working principle is as follows:
the intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P20(i.e., gas density value). When the density relay body 1 is needed or/and can be verified, if the gas density value P is present20Not less than set safety check density value PS(ii) a The gas density relay sends out the instruction, controls the control circuit of unit 7 disconnection gas density relay body 1 through the intelligence promptly for can not influence electrical equipment's safe operation when online check-up gas density relay body 1, also can not be when the check-up, the mistake sends alarm signal, or shutting control circuit. Because the gas density value P of the gas density relay is already carried out before the calibration is started20Not less than set safety check density value PSThe gas of the electrical equipment is in a safe operation range, and the gas leakage is a slow process and is safe during verification. Meanwhile, the intelligent control unit 7 is communicated with the contact sampling circuit of the gas density relay body 1, then the intelligent control unit 7 controls the temperature adjusting mechanism 5 to increase the temperature of the gas density relay body 1, so that the temperature of the temperature compensating element of the density relay is increased, the temperature change speed is not more than 1.0 ℃ per second when the temperature is close to the action value (even not more than 0.5 ℃ per second, or the requirement is set according to the requirement), namely the temperature requirement is stably increased or decreased. Until the action of the contact takes place for the gas density relay body 1, the contact action is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, and the intelligent control unit 7 is according to the contactAnd (3) obtaining the gas density value by the pressure value and the temperature value during action, or directly obtaining the gas density value, detecting the contact signal action value of the gas density relay, and finishing the verification work of the contact signal action value of the gas density relay.
After the gas density relay body 1 completes the checking work, the gas density relay judges and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) the gas density relay (or gas density monitoring device) may be annunciated in situ, for example by indicator lights, digital or liquid crystal displays; 2) or the gas density relay (or the gas density monitoring device) can upload the data in an online remote transmission communication mode, for example, the data can be uploaded to a background of an online monitoring system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In short, after the gas density relay (or the gas density monitoring device) completes the on-line verification work of the gas density relay, if an abnormality occurs, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the gas density relay completes the calibration work of the gas density relay, if the gas density relay is abnormal, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay body 1 to a remote end (a monitoring room, a background monitoring platform and the like) and can display the notice on site. The simple gas density relay is used for on-line calibration, and the result of abnormal calibration can be uploaded through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with an alarm signal contact and is regularly closed and opened, and the condition can be obtained through analysis; or through a separate verification signal line. The intelligent mobile phone can be uploaded in good state or in problem, or can be uploaded through remote density on-line monitoring, or can upload a verification result through a single verification signal line, or can be uploaded through on-site display, on-site alarm or wireless uploading and can be uploaded through the internet with the intelligent mobile phone. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the gas density relay can be fully ensured in multiple modes and various combinations.
The gas density relay (or the gas density monitoring device) has a safety protection function, and particularly, when the gas density relay is lower than a set value, the gas density relay automatically does not perform online verification on the density relay any more and sends an informing signal. For example, when the gas density value of the plant is less than the set value PSIt is not verified. For example: only when the gas density value of the equipment is more than or equal to (the alarm pressure value is plus 0.02MPa), the online verification can be carried out.
The gas density relay (or the gas density monitoring device) can perform online verification according to set time, and can also perform online verification according to set temperature (such as extreme high temperature, extreme low temperature, normal temperature, 20 ℃ and the like). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 level. The method can be implemented according to the relevant standard according to the temperature requirement. For example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code, the accuracy requirement corresponding to each temperature value is met.
The gas density relay can compare the error performance of the gas density relay at different temperatures and different time periods. Namely, the performances of the gas density relay and the electrical equipment are judged by comparing the temperature ranges in different periods. The comparison of each period with history and the comparison of the history and the present are carried out.
The gas density relay can be repeatedly verified for multiple times (for example, 2-3 times), and the average value of the gas density relay is calculated according to the verification result of each time. When necessary, the gas density relay can be checked on line at any time. A gas density relay or gas density monitoring device may be referred to generally.
The gas density relay has the functions of pressure and temperature measurement and software conversion. On the premise of not influencing the safe operation of the electrical equipment, the alarm and/or locking contact action value and/or return value of the gas density relay body 1 can be detected on line. Of course, the return value of the alarm and/or latch contact signal may also be left untested as required. Meanwhile, the gas density relay can also monitor the gas density value, and/or the pressure value, and/or the temperature value of the electrical equipment on line, and upload the value to the target equipment to realize on-line monitoring.
Example two:
as shown in fig. 3, the second embodiment of the present invention provides a gas density relay or gas density monitoring device with an online self-calibration function, including: gas density relay body 1, pressure sensor 2, temperature sensor 3, valve 4, temperature regulation mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9, tonifying qi interface 10, pressure regulation mechanism 11. One end of the valve 4 is hermetically connected to an electrical device 8, and the other end of the valve 4 is connected to a multi-way connector 9. The gas density relay body 1 is arranged on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay body 1, and the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path; the temperature adjusting mechanism 5 is arranged on the density relay body 1; the temperature adjusting mechanism 5 mainly comprises a heating element 501 and is controlled by an intelligent control unit 7, that is, a controller of the heating element 501 is arranged or designed together with the intelligent control unit 7. The pressure adjusting mechanism 11 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 11 is communicated with the gas density relay body 1; the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. And the pressure sensor 2, the temperature sensor 3, the valve 4, the temperature adjusting mechanism 5 and the pressure adjusting mechanism 11 are respectively connected with the intelligent control unit 7. The air supply interface 10 is communicated with the multi-way joint 9.
Unlike the first embodiment, the present embodiment further includes a pressure adjustment mechanism 11. The pressure adjusting mechanism 11 includes a piston 1101, a driving mechanism 1102, and a sealing ring 1110, and the driving mechanism 1102 drives the piston 1101 to move in the pressure adjusting mechanism, thereby completing the pressure lifting.
The working principle is as follows: the online checking contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the online checking contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay body 1 and connects the contact of the gas density relay body 1 to the intelligent control unit 7; and closing the valve 4 between the gas density relay body 1 and the electrical equipment through the intelligent control unit 7; the pressure adjusting mechanism 11 is driven by the intelligent control unit 7, so that the pressure of the gas density relay is slowly reduced, and after the pressure is reduced to a target pressure value, the operation can be stopped. Next, the temperature of the gas density relay body 1 is increased by operating or controlling the temperature adjusting mechanism 5 by the intelligent control unit 7, and then the temperature of the temperature compensation element of the density relay is increased, so that the gas density relay generates a contact action, the contact action is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed, which is similar to the first embodiment. The intelligent control unit 7 further comprises a depth calculation unit, and the depth calculation unit can calculate the gas density value or the pressure value of the electrical equipment according to the environmental temperature value.
After all contact signal check-up work is accomplished, through 7 shutoff temperature adjustment mechanism's of intelligent accuse heating element of unit to adjust to operating condition with online check-up contact signal sampling unit 6, the normal operating condition of operation is resumed to the control circuit of gas density relay's contact signal. In this embodiment, the operation sequence of the temperature adjusting mechanism and the pressure adjusting mechanism can be flexible, that is, the pressure adjusting mechanism can be operated first, and then the temperature adjusting mechanism can be operated; or the temperature adjusting mechanism can be operated firstly, and then the pressure adjusting mechanism can be operated; or the pressure adjustment mechanism and the temperature adjustment mechanism may be operated simultaneously.
Example three:
as shown in fig. 4, a third embodiment of the present invention provides a gas density relay (or density monitoring device) with an online self-calibration function, including: gas density relay body 1, first pressure sensor 21, second pressure sensor 22, first temperature sensor 31, second temperature sensor 32, temperature regulation mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9, tonifying qi interface 10, self-sealing valve. One end of the self-sealing valve is connected to the electrical equipment in a sealing mode, and the other end of the self-sealing valve is connected with the multi-way connector 9. The gas density relay body 1, the second pressure sensor 22, the second temperature sensor 32, the temperature adjusting mechanism 5 and the air supplementing interface 10 are arranged on the multi-way joint 9; the first pressure sensor 21 and the first temperature sensor 31 are provided in the gas density relay body 1. The first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are respectively connected with the intelligent control unit 7. The first pressure sensor 21, the second pressure sensor 22 and the gas density relay body 1 are communicated with each other on a gas path.
Different from the first embodiment, there are two pressure sensors, namely a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The present embodiment provides a plurality of pressure sensors and temperature sensors for the purpose of: the pressure values monitored by the first pressure sensor 21 and the second pressure sensor 22 can be compared and verified with each other; the temperature values monitored by the first temperature sensor 31 and the second temperature sensor 32 can be compared and verified with each other; monitored by the first pressure sensor 21 and the first temperature sensor 31Density value P120A density value P2 monitored with the second pressure sensor 22 and the second temperature sensor 3220Comparing and checking each other; even the density value Pe of the rated value of the gas density relay body 1 can be checked and obtained on line20And comparing and checking each other.
In addition, in the technology of the present invention, there are two pressure sensors, which 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 first pressure sensor 21 and the second pressure sensor 22 are respectively provided on both sides of the multi-way joint 9 or on both ends of the valve 4. The utility model discloses the technique has the safety protection function, specifically is: 1) when the density values monitored by the first pressure sensor 21 and the first temperature sensor 31 or the second pressure sensor 22 and the second temperature sensor 32 are lower than the set values, the gas density relay automatically does not verify the gas density relay body 1 any more, and sends out a notification signal. For example, when the gas density value of the plant is less than the set value, it is not verified. The check can only be carried out when the gas density value of the equipment is not less than (blocking pressure +0.02 MPa). The alarm of the contact point has a state indication. 2) Or during the verification, the valve 4 is closed at the moment, and when the density value obtained according to the monitoring of the second pressure sensor 22 and the second temperature sensor 32 is lower than the set value, the gas density relay automatically does not verify the gas density relay body 1 any more, and simultaneously sends out a notification signal (air leakage). For example, when the gas density value of the plant is less than the set value (lock pressure +0.02MPa), it is not verified. The set value can be set arbitrarily as required. Meanwhile, the gas density relay is also provided with a plurality of pressure sensors and temperature sensors for mutual verification, and the sensors and the gas density relay are mutually verified, so that the gas density relay is ensured to normally work. Namely, the pressure values monitored by the first pressure sensor 21 and the second pressure sensor 22 are compared and verified with each other; comparing the temperature values obtained by monitoring by the first temperature sensor 31 and the second temperature sensor 32, and checking each other; first pressure sensor 21 and first temperatureThe density value P1 obtained by monitoring the density sensor 3120A density value P2 monitored with the second pressure sensor 22 and the second temperature sensor 3220Comparing and checking each other; it is even possible to verify the density value Pe of the nominal value of the gas density relay body 120And comparing and checking each other.
Example four:
as shown in fig. 5, a fourth embodiment of the present invention provides a gas density relay (or density monitoring device) with an online self-calibration function, further comprising: a valve 4; one end of the valve 4 is communicated with an electrical device 8, the other end of the valve 4 is communicated with the gas density relay body 1, and the valve 4 is connected with an intelligent control unit 7; according to the set verification time or/and the verification instruction and the gas density value condition or/and the temperature value condition, under the condition that the gas density relay is allowed or/and verified, for example, in winter, the gas pressure of the electrical equipment is low; the online checking contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the online checking contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay body 1 and connects the contact of the gas density relay body 1 to the intelligent control unit; the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism 5 through the intelligent control unit 7, and after the temperature of the gas density relay reaches a set value (for example, the set value temperature is 70 ℃), the valve 4 is closed through the intelligent control unit 7; after the temperature or the pressure of the gas density relay is reduced to be suitable (for example, the ambient temperature is 12 ℃), the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism 5 through the intelligent control unit 7, the temperature of the temperature compensating element of the density relay is increased (if the temperature is increased to 45.6 ℃), the gas density relay body 1 is enabled to generate contact action, the contact action is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to the pressure value and the temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed.
After all the contact signal verification work is completed, the intelligent control unit 7 opens the valve 4, and the intelligent control unit 7 turns off the temperature adjusting mechanism 5.
Example five:
as shown in fig. 6, a gas density relay (or density monitoring device) with an online self-calibration function according to a fifth embodiment of the present invention is composed of three gas density relay bodies (11, 12, 13), three multi-pass connectors (91, 92, 93), three temperature adjustment mechanisms (51, 52, 53), three online calibration contact signal sampling units (61, 62, 63), an intelligent control unit 7, and a gas density detection sensor 2, and completes online calibration of the gas density relay.
Example six:
as shown in fig. 7, a gas density relay (or density monitoring device) with an online self-calibration function according to a sixth embodiment of the present invention is composed of three gas density relay bodies (11, 12, 13), three multi-pass connectors (91, 92, 93), three temperature adjustment mechanisms (51, 52, 53), three online calibration contact signal sampling units (61, 62, 63), three gas density detection sensors (21, 22, 23), and an intelligent control unit 7, and completes online calibration of the gas density relay.
To sum up, the utility model provides a pair of gas density relay with online self-checking function comprises gas circuit (can be through the pipeline) coupling part, temperature regulation part (or still contain the pressure regulation part), signal measurement control part etc. and the main function is that the contact value of gas density relay under the ambient temperature (the pressure value when warning/shutting action) carries out online check-up measurement to the corresponding pressure value when automatic conversion becomes 20 ℃, realize the performance detection to gas density relay's contact (warning and shutting) value on line. The installation positions of the gas density relay, the pressure sensor, the temperature adjusting mechanism, the pressure adjusting mechanism, the valve, the online checking contact signal sampling unit and the intelligent control unit can be flexibly combined. For example: the gas density relay body, the pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together, integrally designed and also can be designed in a split mode; can be arranged on the shell or on the multi-way joint, and can also be connected together through a connecting pipe. The valve can be directly connected with electrical equipment, or can be connected with the electrical equipment through a self-sealing valve or an air pipe. The pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together and are designed integrally; the pressure sensor and the temperature sensor can be combined together and are designed integrally; the online check joint signal sampling unit and the intelligent control unit can be combined together to realize integrated design. In short, the structure is not limited.
The gas density relay with the online self-checking function generally means that the components of the gas density relay are designed into an integral structure; the gas density monitoring device generally refers to that the components of the gas density monitoring device are designed into a split structure and flexibly formed.
When the contact of the density relay is verified at the ambient temperature of high temperature, low temperature, normal temperature and 20 ℃, the requirement for error judgment of the density relay can be different, and the method can be implemented according to the temperature requirement and the related standard; the error performance of the density relay can be compared in different time periods at different temperatures according to the density. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The density relay body can also be subjected to physical examination. When necessary, the density relay contact signals can be checked at any time; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay body. The density value of the electrical equipment, the gas density relay body, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, the gas density relay body and the like, can be judged, compared and analyzed; the contact signal state of the gas density relay is monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay body can be detected or detected and judged; the contact resistance of the contact point of the gas density relay body can be detected or detected and judged; and the insulation performance of the gas density relay body is also detected, or detected and judged. In addition, for the SF6 gas, a specific conversion method of the pressure-temperature characteristic of the SF6 gas can be calculated according to the Betty-Bridgman equation; for the SF6 mixed gas, a specific conversion method of the pressure-temperature characteristic of the SF6 mixed gas can be calculated according to a Dalton partial pressure law, a Betty-Bridgman equation and an ideal gas state equation.
The anti-rust and anti-vibration device is compact and reasonable in structural arrangement, good in anti-rust and anti-vibration capacity of each part, firm in installation and reliable in use. The connection, the dismouting of each pipeline of gas density relay are easily operated, and equipment and part are convenient to be maintained. The gas density relay calibration device can complete the calibration work of the gas density relay without a maintainer going to the site, greatly improves the reliability of a power grid, improves the efficiency and reduces the cost.
The foregoing detailed description of the embodiments of the application has been presented by way of example only and the application is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to the present application are within the scope of the present application for those skilled in the art. Accordingly, equivalent alterations and modifications are intended to be included within the scope of this application without departing from the spirit and scope of this application.
Claims (36)
1. A gas density relay with an online self-checking function is characterized by comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a multi-way joint, a temperature adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the gas path of the gas density relay body is connected with the first interface of the multi-way connector;
the temperature adjusting mechanism is a temperature-adjustable adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body so as to enable the gas density relay body to generate contact signal action;
the online check contact signal sampling unit is directly or indirectly connected with the gas density relay body and is configured to sample a contact signal generated when a contact of the gas density relay body acts;
the intelligent control unit is respectively connected with the gas density detection sensor, the temperature adjusting mechanism and the online check contact signal sampling unit, and is configured to complete control of the temperature adjusting mechanism, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
2. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,
the temperature adjusting mechanism is arranged in the gas density relay body; or,
the temperature adjusting mechanism is arranged outside the gas density relay body; or,
the gas density detection sensor, the temperature adjusting mechanism, the online checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,
the multi-way joint is arranged on the gas density relay body; or,
the temperature adjusting mechanism is arranged on the multi-way joint; or,
the temperature adjusting mechanism and the gas density detection sensor are arranged on the multi-way joint; or,
the online checking contact signal sampling unit and the intelligent control unit are arranged on the multi-way connector.
3. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body and the gas density detection sensor are of an integrated structure.
4. A gas density relay with on-line self-checking function according to claim 3, characterized in that: the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
5. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density detection sensor is of an integrated structure.
6. The gas density relay with the online self-checking function according to claim 5, wherein: the gas density detection sensor is a gas density transmitter with an integrated structure.
7. The gas density relay with the online self-checking function according to claim 6, wherein: the online checking contact signal sampling unit is arranged on the gas density transmitter.
8. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online check joint signal sampling unit and the intelligent control unit are arranged together.
9. The gas density relay with the online self-checking function according to claim 8, wherein: the online checking contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
10. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or,
a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or,
a density detection sensor adopting quartz tuning fork technology.
11. A gas density relay with an on-line self-checking function according to claim 10, wherein: the pressure sensor is arranged on the gas path of the gas density relay body;
the temperature sensor is arranged on or outside the gas path of the gas density relay body, or in the gas density relay body, or outside the gas density relay body.
12. A gas density relay with an on-line self-checking function according to claim 10, wherein: the pressure sensor includes a relative pressure sensor, and/or an absolute pressure sensor.
13. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to the electrical equipment who monitors.
14. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, and completes online verification of the gas density relay; or,
the intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay's online check-up.
15. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; or,
the gas density relay body has the pressure value output signal of comparing, should compare pressure value output signal with the intelligence is controlled the unit and is connected.
16. The gas density relay with the online self-checking function according to claim 1, wherein the temperature adjusting mechanism is a heating element; or,
the temperature adjusting mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature adjusting mechanism shell; or,
the temperature adjusting mechanism comprises a heating element and a temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or,
the temperature adjusting mechanism comprises a heating element, a controller and a temperature detector; or,
the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or,
the temperature adjusting mechanism is a miniature thermostat;
the heating element comprises a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor;
the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises one of a PID controller, a controller formed by combining PID and fuzzy control, a variable frequency controller and a PLC controller.
17. The gas density relay with the online self-checking function according to claim 1, further comprising: and one end of the valve is provided with a connector communicated with the electrical equipment and communicated with the electrical equipment, and the other end of the valve is communicated with the gas density relay body.
18. A gas density relay with an on-line self-checking function according to claim 17, wherein: the valve is also connected with the intelligent control unit, and the valve is closed or opened under the control of the intelligent control unit.
19. A gas density relay with an on-line self-checking function according to claim 17, wherein: the valve is an electric valve, or an electromagnetic valve, or a piezoelectric valve, or a temperature control valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
20. A gas density relay with an on-line self-checking function according to claim 17, wherein: the multi-way connector is provided with a third interface, the third interface is provided with a connecting part which is in butt joint with the electrical equipment monitored by the gas density relay, and the valve is embedded in the connecting part.
21. The gas density relay with the online self-checking function according to claim 1, further comprising: the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas density relay body, and then the gas density relay body is matched with or/and combined with the temperature regulating mechanism to generate contact signal action; the intelligent control unit is connected with the pressure adjusting mechanism to complete the control of the pressure adjusting mechanism; or,
further comprising: the intelligent control unit is connected with the heating device; or,
still include air chamber and heating device, the air chamber with the gas density relay body is linked together, the outside or the inside of air chamber are equipped with the heating device, the intelligence accuse unit with the heating device is connected.
22. A gas density relay with on-line self-checking function according to claim 21, characterized in that: the pressure regulating mechanism is sealed in a cavity or a shell.
23. A gas density relay with on-line self-checking function according to claim 21, characterized in that: during verification, the pressure adjusting mechanism is a closed air chamber, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating through the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased; or,
the pressure adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with the multi-way joint; a piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod to further drive the piston to move in the cavity; or,
the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber and is in sealed contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the multi-way joint; or,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the multi-way joint, and the other end of the corrugated pipe stretches under the driving of the driving part; or,
the pressure adjusting mechanism is a deflation valve which is an electromagnetic valve or an electric valve; or,
the pressure regulating mechanism is a compressor; or,
the pressure adjusting mechanism is a pump, and the pump comprises one of a pressurizing pump, an electric air pump and an electromagnetic air pump;
wherein, the driving part comprises one of a magnetic force, a motor, a reciprocating mechanism, a Carnot cycle mechanism and a pneumatic element.
24. A gas density relay with on-line self-checking function according to claim 23, characterized in that: the pressure regulating mechanism further comprises a heat insulation piece, and the heat insulation piece is arranged outside the closed air chamber.
25. The gas density relay with the online self-checking function according to claim 1, wherein the online checking contact signal sampling unit samples the contact signal of the gas density relay body so as to satisfy the following conditions:
the online check joint signal sampling unit is provided with at least one group of independent sampling joints, can automatically complete check on at least one joint simultaneously, and continuously measures without changing the joint or reselecting the joint; wherein,
the contact includes one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.
26. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is provided with an electrical interface, the electrical interface finishes test data storage, and/or test data export, and/or test data printing, and/or carries out data communication with an upper computer, and/or inputs analog quantity and digital quantity information.
27. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.
28. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is also provided with a clock, and the clock is configured to be used for regularly setting the verification time of the gas density relay, or recording the test time, or recording the event time.
29. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is controlled through field control and/or background control.
30. The gas density relay with the online self-checking function according to claim 1, further comprising: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current verification data in real time and/or supports data input.
31. The gas density relay with the online self-checking function according to claim 1, further comprising: respectively with the gas density relay body with the little water sensor that the unit is connected is controlled to the intelligence, and/or respectively with the gas density relay body with the decomposition thing sensor that the unit is connected is controlled to the intelligence.
32. The gas density relay with the online self-checking function according to claim 1, wherein the gas density relay body comprises: the device comprises a shell, a base, a pressure detector, a temperature compensation element and at least one signal generator, wherein the base, the pressure detector, the temperature compensation element and the at least one signal generator are arranged in the shell;
the first interface of the multi-way joint is communicated with the base; the online check contact signal sampling unit is connected with the signal generator;
the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
33. A gas density relay with on-line self-verification function according to claim 32, wherein: the gas density relay body also comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or
The gas density relay body further comprises a display mechanism, and the display mechanism comprises liquid crystals or/and a digital tube.
34. A gas density relay with on-line self-verification function according to claim 32, wherein: the gas density relay body or the gas density monitoring device further comprises a contact resistance detection unit; the contact resistance detection unit is connected with the contact point signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the density relay acts and/or receives an instruction of detecting the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.
35. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online calibration method comprises the following steps that at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online calibration contact signal sampling units, an intelligent control unit and a gas density detection sensor are used for completing online calibration of the gas density relay; or,
the online calibration method comprises the following steps that at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online calibration contact signal sampling units, at least two intelligent control units and a gas density detection sensor are used for completing online calibration of the gas density relay; or,
at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, at least two gas density detection sensors and an intelligent control unit are used for completing the on-line checking of the gas density relay.
36. The utility model provides a gas density monitoring devices with online self-checking function which characterized in that: the gas density monitoring device is composed of a gas density relay with an online self-checking function as claimed in any one of claims 1-35; or, the gas density monitoring device comprises a gas density relay with an online self-checking function as claimed in any one of claims 1-35.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110487670A (en) * | 2019-09-04 | 2019-11-22 | 上海乐研电气有限公司 | A kind of gas density relay and its method of calibration with online self checking function |
| WO2021043036A1 (en) * | 2019-09-04 | 2021-03-11 | 上海乐研电气有限公司 | Field detection device, system and method for achieving no maintenance of gas density relay |
| CN114295968A (en) * | 2021-11-19 | 2022-04-08 | 国网浙江省电力有限公司金华供电公司 | SF6 density relay calibration equipment based on temperature compensation |
| CN115575283A (en) * | 2022-09-30 | 2023-01-06 | 南京凤嘉科技有限公司 | Control circuit of SF6 gas density meter |
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2019
- 2019-09-04 CN CN201921457299.8U patent/CN211426165U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487670A (en) * | 2019-09-04 | 2019-11-22 | 上海乐研电气有限公司 | A kind of gas density relay and its method of calibration with online self checking function |
| WO2021043036A1 (en) * | 2019-09-04 | 2021-03-11 | 上海乐研电气有限公司 | Field detection device, system and method for achieving no maintenance of gas density relay |
| CN110487670B (en) * | 2019-09-04 | 2024-06-21 | 上海乐研电气有限公司 | Gas density relay with online self-checking function and checking method thereof |
| CN114295968A (en) * | 2021-11-19 | 2022-04-08 | 国网浙江省电力有限公司金华供电公司 | SF6 density relay calibration equipment based on temperature compensation |
| CN115575283A (en) * | 2022-09-30 | 2023-01-06 | 南京凤嘉科技有限公司 | Control circuit of SF6 gas density meter |
| 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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