CN210775758U - 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 PDF

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Publication number
CN210775758U
CN210775758U CN201921457321.9U CN201921457321U CN210775758U CN 210775758 U CN210775758 U CN 210775758U CN 201921457321 U CN201921457321 U CN 201921457321U CN 210775758 U CN210775758 U CN 210775758U
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gas density
density relay
gas
pressure
online
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夏铁新
贺兵
常敏
郭正操
廖海明
金海勇
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Shanghai Roye Electric Science and Technology Co Ltd
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Shanghai Roye Electric Science and Technology Co Ltd
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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, gas density relay include gas density relay body, gas density detection sensor, lead to joint, pressure adjustment mechanism, online check-up contact signal sampling unit and intelligence accuse unit more, valve part or whole embedded in lead to on the joint more, or valve and lead to the integrated design that connects more. Through the lift of pressure adjustment mechanism regulated pressure for the contact action takes place for gas density relay body, the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, the density value when the intelligence is controlled the unit and is acted 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 the maintainer to the check-up work that just can accomplish gas density relay to the scene, the reliability of electric wire netting has been improved, the work efficiency is improved, the cost is reduced.

Description

Gas density relay with online self-checking function and monitoring device
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 substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF2The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture 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 valve, a pressure 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 gas path of the pressure regulating mechanism is connected with a second interface of the multi-way connector, and the first interface is communicated with the second interface so as to communicate the gas path of the pressure regulating mechanism with the gas path of the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
the multi-way joint is also provided with a third interface, the third interface is provided with a connecting part butted with electrical equipment, and the third interface is communicated with the first interface and the second interface;
the valve is partially or completely embedded in the multi-way joint, or the valve and the multi-way joint are integrally designed; the gas inlet of the valve is provided with an interface communicated with electrical equipment, and the gas outlet of the valve is communicated with the gas path of the gas density relay body and the gas path of the pressure regulating mechanism;
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 of the gas density relay body;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the gas density detection sensor, the valve and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value collection, temperature value collection and/or gas density value collection, control of closing or opening of the valve, 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 valve, a pressure 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 gas path of the pressure regulating mechanism is connected with a second interface of the multi-way connector, and the first interface is communicated with the second interface so as to communicate the gas path of the pressure regulating mechanism with the gas path of the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
the multi-way joint is also provided with a third interface, the third interface is provided with a connecting part butted with electrical equipment, and the third interface is communicated with the first interface and the second interface;
the valve is partially or completely embedded in the multi-way joint, or the valve and the multi-way joint are integrally designed; the gas inlet of the valve is provided with an interface communicated with electrical equipment, and the gas outlet of the valve is communicated with the gas path of the gas density relay body and the gas path of the pressure regulating mechanism;
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 of the gas density relay body;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the gas density detection sensor, the valve and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value collection, temperature value collection and/or gas density value collection, control of closing or opening of the valve, 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; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the gas density detection sensor, the pressure adjusting mechanism, the online checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the multi-way joint is arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the pressure 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 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; 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.
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 a thermal resistor and a thermocouple.
More preferably, the temperature sensor is installed 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 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; alternatively, the first and second electrodes may be,
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 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.
Preferably, the valve is an electrically operated valve.
Preferably, the valve is a solenoid valve.
More preferably, the valve is a permanent magnet solenoid valve.
Preferably, the valve is a piezoelectric valve, or a temperature control valve, or a novel valve which is made of an intelligent memory material and is opened or closed by electric heating.
Preferably, the valve is closed or opened in a hose bending or flattening mode.
Preferably, the valve is sealed within a chamber or housing.
Preferably, the valve and the pressure regulating mechanism are sealed within a chamber or housing.
Preferably, pressure sensors are respectively arranged on two sides of the air path of the valve.
Preferably, the front end of the valve is provided with a gas density relay body or a density switch.
Preferably, the gas density relay with an online self-checking function further comprises: and the self-sealing valve is arranged between the multi-way connector and the electrical equipment.
Preferably, the pressure regulating mechanism is sealed within a chamber or housing.
Preferably, during verification, the pressure adjusting mechanism is a closed air chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased.
More preferably, the heating element, and/or the cooling element is a semiconductor.
More preferably, the pressure adjusting mechanism further comprises a heat insulating member, and the heat insulating member is arranged outside the closed air chamber.
Preferably, during checking, 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.
Preferably, during verification, the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force.
Preferably, 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.
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.
Preferably, the pressure regulating mechanism is a purge valve.
More preferably, the pressure regulating mechanism further comprises a flow valve controlling the gas release flow rate.
More preferably, the air release valve is an electromagnetic valve or an electric valve, or other air release valves realized by electric or pneumatic means.
Preferably, the pressure regulating mechanism is a compressor.
Preferably, the pressure regulating mechanism is a pump.
More preferably, the pump includes, but is not limited to, one of a pressurizing pump, an electric air pump, and an electromagnetic air pump.
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 content of the first and second substances,
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 the gas density monitoring device) supports the input of basic information of the gas density relay, wherein the basic information comprises one or more of, but is not limited to, a factory number, a precision requirement, a rated parameter, a manufacturing plant and an operation position.
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; alternatively, the first and second electrodes may be,
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 third interface of the multi-way joint further comprises an open valve, or further comprises an equipment-side self-sealing valve, or further comprises an equipment-side valve.
Preferably, the gas density relay body includes: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators 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.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
the application provides a gas density relay with online self-checking function for high pressure, middling pressure electrical equipment, including gas density relay body, gas density detection sensor, many logical joints, valve, pressure adjustment mechanism, online check-up contact signal sampling unit and intelligent control unit. Through the lift of pressure adjustment mechanism regulated pressure, make the gas density relay body take place the contact action, the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, the density value when the intelligence is controlled the unit and is acted 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 the maintainer to the check-up work that just can accomplish gas density relay on the spot, the reliability of electric wire netting has been improved, the efficiency is improved, the cost is reduced, can realize the non-maintaining of gas density relay. Meanwhile, the whole checking process realizes zero emission of SF6 gas and meets 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 diagram of a multi-way joint and a valve of a gas density relay with an online self-checking function according to the first embodiment;
fig. 3 is a schematic structural view of a gas density relay body according to a first preferred embodiment of the present application;
fig. 4 is a schematic structural diagram of a gas density relay with an online self-checking function according to a second 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, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9 and tonifying qi interface 10. The gas density relay body 1, the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the air supply interface 10 are arranged on the multi-way joint 9. Specifically, referring to fig. 2, the multi-way connector is provided with a third interface 91, a connecting portion for butting with the electrical device 8 is provided at the third interface 91, and the valve 4 is partially or completely embedded in the multi-way connector 9, that is, the valve 4 and the multi-way connector 9 are integrally designed. The multi-way joint 9 comprises a multi-way joint body, a valve 4, interfaces 91, 92, 93 and 95, an equipment air channel 901, an air channel (checking air channel) 905 which internally comprises a pressure adjusting mechanism and a plurality of sensor instrument air channels (not shown in the figure) which are mutually communicated; the multi-way joint 9 is communicated with the electrical equipment through an equipment air duct 901 and arranged on the electrical equipment 8 through a connector 91, the pressure adjusting mechanism 5 is communicated with the multi-way joint 9 through a pressure adjusting mechanism air duct (checking air duct) 905, and the sensor instrument air ducts (not shown in the figure) are provided with a pressure sensor 2 and a temperature sensor 3. The gas density relay body 1 is arranged on the interface 92, the air supply interface 10 is arranged on the interface 93 of the multi-way joint 9, and the pressure adjusting mechanism 5 is arranged on the interface 95 of the multi-way joint 9. The facility air duct 901 is provided opposite to the valve 4, and the facility air duct 901 is provided corresponding to the shutoff block 4031 of the valve 4. The valve 4 is configured to close or open the device air passage 901 after being instructed to close or open the device air passage 901, so that the device air passage 901 is closed or opened. The valve opening member 9101 is disposed at a position corresponding to the air passage 901 of the device and corresponding to the interface 91, and the valve opening member 9101 is used to open a self-sealing valve on the electrical device 8.
The pressure sensor 2 is communicated with the gas density relay body 1 on a gas path through a multi-way joint 9; the pressure adjusting mechanism 5 is communicated with the gas density relay body 1 through a multi-way joint 9; 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 valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure 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.
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 thermal resistance and thermocouple; can be digital type and analog type, such as DS18B20, pt 100. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.
The valve 4 can be controlled by various transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic hydraulic, electrohydraulic, pneumatic hydraulic, spur gear and bevel gear drive; the valve can be operated according to the preset requirement under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can make the opening and closing piece perform lifting, sliding, swinging or rotating motion by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve can be changed to realize the control function of the valve. The valve 4 can be driven by automatic valves, power-driven valves and manual valves. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric motor (motor) drive. The valve may be automatic or manual, semi-automatic. The verification process can be automatically completed or semi-automatically completed through manual cooperation. The valves are connected, either directly or indirectly, integrally or separately, to the electrical equipment through self-sealing valves, manual valves, or non-removable valves. The valve may be normally open or normally closed, unidirectional or bidirectional, as desired. In short, the air passage is opened or closed through the electric control valve. The electric control valve can adopt the following modes: electromagnetic valve, electric control ball valve, electric control proportional valve, etc.
The pressure adjustment mechanism 5 of this embodiment is one end open-ended cavity, there is piston 51 in the cavity, piston 51 is equipped with sealing washer 510, piston 51's one end is connected with an regulation pole, drive unit 52 is connected to the outer end of adjusting the pole, piston 51's the other end stretches into in the opening, and with the inner wall of cavity contacts, drive unit 52 drive adjust the pole and then drive piston 51 is in the intracavity removes. The driving member 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or step motor), a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.
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 control of the valve 4, the control of the pressure regulating mechanism 5 and the signal acquisition are completed through the intelligent control unit 7. 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(gas 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 detectedD20To complete the gas density relayAnd (5) verifying the body 1.
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, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7 and the multi-pass 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. In short, the arrangement between them can be flexibly arranged and combined.
Fig. 3 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. 3, 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; 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 needs to be checked, if the gas density value P is detected at the moment20Not less than set safety check density value PS(ii) a The gas density relay issues a command, i.e. the valve 4 is closed by the intelligent control unit 7, so that the gas density relay body 1 is isolated from the electrical equipment on the gas path. Then, the intelligent control unit 7 disconnects the control loop of the gas density relay body 1, so that the safe operation of the electrical equipment cannot be influenced when the gas density relay body 1 is checked on line, and an alarm signal cannot be sent by mistake or the control loop cannot be locked when the gas density relay body is checked. 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 slowSlow process, it is safe to check. Simultaneously, unit 7 communicates the contact sampling circuit of gas density relay body 1 is controlled to the intelligence, then, unit 7 control pressure adjustment mechanism 5's drive component 52 is controlled to the intelligence (can mainly adopt motor and gear to realize, its mode is various, it is nimble), and then adjust pressure adjustment mechanism 5's piston 51, make by piston 51, gas density relay body 1, the seal chamber that valve 4 etc. is constituteed takes place the volume change, the gaseous pressure of gas density relay body 1 progressively descends, make density relay 1 take place the contact action, its contact action passes to intelligence control unit 7 through on-line check-up contact signal sampling unit 6, the pressure value and the temperature value that record when intelligence control unit 7 moves according to the contact, according to gas characteristic conversion become corresponding 20 ℃ pressure value P when pressure value P20(density value), the contact point action value P of the gas density relay body 1 can be detectedD20After the contact action values of the alarm and/or locking signals of the gas density relay body 1 are detected, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure adjusting mechanism 5 to adjust the piston 51 of the pressure adjusting mechanism 5, so that the pressure of the gas density relay body 1 is gradually increased, and the return value of the alarm and/or locking contact signals of the gas density relay body 1 is tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay body 1 is completed. Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and at this time, the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. Meanwhile, the valve 4 is opened through the intelligent control unit 7, so that the gas density relay body 1 is communicated with the electrical equipment on a gas path. Through the control circuit of unit 7 intercommunication gas density relay body 1 is controlled to the intelligence, the normal work of density monitoring circuit of gas density relay body 1, and gas density of 1 safety monitoring electrical equipment of gas density relay body makes electrical equipment work safe and reliable. Therefore, the online checking work of the gas density relay body 1 can be conveniently completed, and the safe operation of the electrical equipment can not be influenced when the gas density relay body 1 is checked online.
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 may be annunciated locally, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or the gas density relay 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 a word, after the gas density relay completes the online checking work of the gas density relay, if the gas density relay is abnormal, 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 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 announcement 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 may be checked on line according to a set time, or may be checked on line according to a set temperature (for example, a limit high temperature, a limit low temperature, a normal temperature, 20 degrees, etc.). 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.
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. 4, 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, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9, tonifying qi interface 10. The multi-way connector is provided with a third interface, the third interface is provided with a connecting part butted with the electrical equipment 8, part (or all) of the valve 4 is embedded on the multi-way connector 9, namely, the valve 4 and the multi-way connector 9 are integrally designed. The gas density relay body 1 is arranged on the multi-way joint 9; pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6 and intelligent control unit 7 set up on gas density relay body 1. The pressure sensor 2 is communicated with the gas density relay body 1 on a gas path; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with the gas density relay body 1; the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together; the temperature sensor 3 is provided near the temperature compensation element inside the housing of the gas density relay body 1. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7. The air supply interface 10 is communicated with the multi-way joint 9.
In a clear difference from the first embodiment, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air chamber 57, a heating element 58, a heat insulating member 59, and a pressure adjustment mechanism housing 511. The air chamber 57 is externally (or internally) provided with a heating element 58, and the temperature is changed by heating, so that the pressure is increased or decreased. Through this pressure adjustment mechanism 5 regulated pressure for gas density relay body 1 takes place the contact action, and the contact action transmits intelligent accuse unit 7 through online check-up contact signal sampling unit 6, and unit 7 is controlled to the intelligence according to pressure value and temperature value when the contact of gas density relay body 1 moves, converts into corresponding density value, detects gas density relay's warning and/or shutting contact action value and/or return value, accomplishes the check-up work to gas density relay.
The working principle of the embodiment is as follows: when the density relay needs to be checked, the intelligent control unit 7 controls the heating element 58 of the pressure adjusting mechanism 5 to heat, and when the temperature difference between the temperature value (T510) in the pressure adjusting mechanism 5 and the temperature value T of the temperature sensor 3 reaches a set value, the intelligent control unit 7 can be used for closing the valve 4, so that the gas density relay is isolated from the electrical equipment on a gas path; and then immediately turning off the heating element 58 of the adjusting mechanism 5, stopping heating the heating element 58, gradually reducing the pressure of the gas in the sealed gas chamber 57 of the pressure adjusting mechanism 5, so that the gas density relay body 1 generates alarm and/or locking contact actions, respectively, the contact actions are transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, and the intelligent control unit 7 detects the alarm and/or locking contact action values and/or return values of the gas density relay according to the density values of the alarm and/or locking contact actions, thereby completing the checking work of the gas density relay. In the embodiment, a trace water sensor is arranged on a main gas passage connected with the pressure regulating mechanism 5 and the electrical equipment (a detection probe of the trace water sensor is arranged on the main gas passage connected with the pressure regulating mechanism 5 and the electrical equipment) to accurately monitor the trace water content of the gas; and connecting a decomposition sensor to monitor the content of the gaseous decomposition.
In the technical scheme of the product, the number of the pressure sensors can be two, namely a first pressure sensor and a second pressure sensor; the temperature sensors can be two, namely a first temperature sensor and a second temperature sensor. The safety protection function is realized, and the method specifically comprises the following steps: 1) when the density value obtained by monitoring the first pressure sensor and the first temperature sensor or the second pressure sensor and the second temperature sensor is lower than the set value, the gas density relay automatically stops the gas supplyThe density relay body 1 performs a verification and sends 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 contact point alarms and has a status 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 and the second temperature sensor is lower than the set value, the gas density relay does not automatically 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. Comparing the pressure values obtained by monitoring the first pressure sensor and the second pressure sensor, and checking each other; comparing the temperature values obtained by monitoring the first temperature sensor and the second temperature sensor, and checking each other; the density value P1 obtained by monitoring the first pressure sensor and the first temperature sensor20A density value P2 monitored with the second pressure sensor and the second temperature sensor20Comparing 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.
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, pressure regulation part, signal measurement control part etc. and the primary 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 and measure to the corresponding pressure value when automatic conversion becomes 20 ℃, the performance testing to the contact (warning and shutting) value of gas density relay is realized on line. The installation positions of the gas density relay, the pressure sensor, the temperature sensor, the pressure regulating 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.
A gas density relay with an online self-checking function generally refers to a structure that the components are designed into a whole; 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 above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.

Claims (29)

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 valve, a pressure 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 gas path of the pressure regulating mechanism is connected with a second interface of the multi-way connector, and the first interface is communicated with the second interface so as to communicate the gas path of the pressure regulating mechanism with the gas path of the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
the multi-way joint is also provided with a third interface, the third interface is provided with a connecting part butted with electrical equipment, and the third interface is communicated with the first interface and the second interface;
the valve is partially or completely embedded in the multi-way joint, or the valve and the multi-way joint are integrally designed; the gas inlet of the valve is provided with an interface communicated with electrical equipment, and the gas outlet of the valve is communicated with the gas path of the gas density relay body and the gas path of the pressure regulating mechanism;
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 of the gas density relay body;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the gas density detection sensor, the valve and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value collection, temperature value collection and/or gas density value collection, control of closing or opening of the valve, 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; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the gas density detection sensor, the pressure adjusting mechanism, the online checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the multi-way joint is arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism and the gas density detection sensor are arranged on the multi-way joint; alternatively, the first and second electrodes may be,
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; or the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
4. 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; or, the gas density detection sensor is a gas density transmitter with an integrated structure.
5. The gas density relay with the online self-checking function according to claim 4, wherein: the online checking contact signal sampling unit is arranged on the gas density transmitter.
6. 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.
7. The gas density relay with the online self-checking function according to claim 6, wherein: the online checking contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
8. 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; alternatively, the first and second electrodes may be,
a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, the first and second electrodes may be,
a density detection sensor adopting quartz tuning fork technology.
9. The gas density relay with the online self-checking function according to claim 8, 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.
10. The gas density relay with the online self-checking function according to claim 8, wherein: the pressure sensor includes a relative pressure sensor, and/or an absolute pressure sensor.
11. 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.
12. The gas density relay with the online self-checking function as claimed in claim 11, wherein the intelligent control unit calculates the gas density value by using an averaging method, the averaging 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; alternatively, the first and second electrodes may be,
setting 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 all temperature ranges to obtain gas density values; alternatively, the first and second electrodes may be,
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.
13. 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; alternatively, the first and second electrodes may be,
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.
14. 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; alternatively, the first and second electrodes may be,
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.
15. The gas density relay with the online self-checking function according to claim 1, characterized in that: the valve is an electric valve and/or an electromagnetic valve, or a piezoelectric valve, or a temperature control valve, or a novel valve which is made of an intelligent memory material and is opened or closed by electric heating.
16. The gas density relay with the online self-checking function according to claim 1, characterized in that: the pressure regulating mechanism is sealed in a cavity or a shell.
17. The gas density relay with the online self-checking function according to claim 1, 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 the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased; alternatively, the first and second electrodes may be,
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; alternatively, the first and second electrodes may be,
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; alternatively, the first and second electrodes may be,
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; alternatively, the first and second electrodes may be,
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; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a deflation valve which is an electromagnetic valve or an electric valve; alternatively, the first and second electrodes may be,
the pressure regulating mechanism is a compressor; alternatively, the first and second electrodes may be,
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.
18. A gas density relay with an on-line self-checking function according to claim 17, wherein: the pressure regulating mechanism further comprises a heat insulation piece, and the heat insulation piece is arranged outside the closed air chamber.
19. 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 content of the first and second substances,
the contact includes one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.
20. 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.
21. 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.
22. 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.
23. 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.
24. 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.
25. 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.
26. 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 a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators 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.
27. A gas density relay with on-line self-checking function according to claim 26, 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.
28. A gas density relay with on-line self-checking function according to claim 26, 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.
29. 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 1-28; or, the gas density monitoring device comprises a gas density relay with an online self-checking function as claimed in any one of claims 1-28.
CN201921457321.9U 2019-09-04 2019-09-04 Gas density relay with online self-checking function and monitoring device Active CN210775758U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112083326A (en) * 2020-08-17 2020-12-15 东风电驱动系统有限公司 Testing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112083326A (en) * 2020-08-17 2020-12-15 东风电驱动系统有限公司 Testing device
CN112083326B (en) * 2020-08-17 2023-06-20 东风电驱动系统有限公司 Test device

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