CN211719506U - Gas density relay with online self-checking function and monitoring device - Google Patents
Gas density relay with online self-checking function and monitoring device Download PDFInfo
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Abstract
The application provides a gas density relay and monitoring devices with online self-checking function, including gas density relay body, first pressure sensor, third pressure sensor, temperature sensor, pressure adjustment mechanism, online check-up contact signal sampling unit and intelligent control unit. The gas density relay body comprises a first sealed gas chamber filled with compensation gas, a second sealed gas chamber communicated with the insulating gas of the electrical equipment, and a third sealed gas chamber communicated with a gas path of the pressure adjusting mechanism; the first pressure sensor is communicated with the second sealed air chamber, and the third pressure sensor is communicated with the third sealed air chamber; the intelligent control unit controls the pressure regulating mechanism to regulate the pressure of the third sealed air chamber to rise and fall, so that the gas density relay body is subjected to contact action, the checking work of the gas density relay is completed, no maintainer needs to check on site, the working efficiency is improved, and the sealing requirement of a power grid is reduced.
Description
Technical Field
The utility model relates to an electric power tech field, concretely relates to use on high pressure, middling pressure electrical equipment, have on line from gas density relay and monitoring devices of check-up function.
Background
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.
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, and no maintenance personnel is needed to arrive at the site, so as to improve the working efficiency and reduce the operation and maintenance cost.
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 intelligent control system comprises a gas density relay body, a first pressure sensor, a third pressure sensor, a temperature sensor, a pressure adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;
the gas density relay body includes: the air conditioner comprises a shell, a first sealed air chamber, a second sealed air chamber and a third air chamber, wherein the first sealed air chamber, the second sealed air chamber and the third air chamber are communicated with an insulating air chamber of electrical equipment;
the first pressure sensor is communicated with the first sealed air chamber;
the third pressure sensor is communicated with a third sealed air chamber of the gas density relay body;
the pressure adjusting mechanism is arranged outside the gas density relay body, and a gas path of the pressure adjusting mechanism is communicated with the third sealed gas chamber and is configured to adjust the gas pressure of the third sealed gas chamber to rise and fall so as to enable the gas density relay body to generate contact signal action;
the online check contact signal sampling unit is connected with the signal generator of the gas density relay body and is configured to sample a contact signal of the gas density relay body, which generates a contact signal action;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the first pressure sensor, the third pressure sensor, the temperature sensor and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detect 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 intelligent control system comprises a gas density relay body, a first pressure sensor, a third pressure sensor, a temperature sensor, a pressure adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;
the gas density relay body includes: the air conditioner comprises a shell, a first sealed air chamber, a second sealed air chamber and a third air chamber, wherein the first sealed air chamber, the second sealed air chamber and the third air chamber are communicated with an insulating air chamber of electrical equipment;
the first pressure sensor is communicated with the first sealed air chamber;
the third pressure sensor is communicated with a third sealed air chamber of the gas density relay body;
the pressure adjusting mechanism is arranged outside the gas density relay body, and a gas path of the pressure adjusting mechanism is communicated with the third sealed gas chamber and is configured to adjust the gas pressure of the third sealed gas chamber to rise and fall so as to enable the gas density relay body to generate contact signal action;
the online check contact signal sampling unit is connected with the signal generator of the gas density relay body and is configured to sample a contact signal of the gas density relay body, which generates a contact signal action;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the first pressure sensor, the third pressure sensor, the temperature sensor and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detect 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 relay body includes: the device comprises a shell, a first corrugated pipe, a second corrugated pipe, a signal generator and a signal adjusting mechanism; the first opening end of the first corrugated pipe is fixed on the inner wall of the shell, the second opening end of the first corrugated pipe is connected with the first sealing element in a sealing mode, the inner wall of the first corrugated pipe, the first sealing element and the inner wall of the shell jointly enclose the first sealed air chamber, and the first sealed air chamber is provided with an interface communicated with insulating gas of electrical equipment; a first opening end of the second corrugated pipe is connected with the first sealing element in a sealing mode, a second opening port of the second corrugated pipe is connected with the inner wall of the shell through a second sealing element, and the outer wall of the first corrugated pipe, the first sealing element, the outer wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly enclose the second sealed air chamber; the inner wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly enclose a third sealed air chamber, the signal generator and the signal adjusting mechanism are arranged in the third sealed air chamber, the signal adjusting mechanism is connected with the first sealing element, and the signal generator is arranged corresponding to the signal adjusting mechanism.
The positions of the first sealed air chamber and the second sealed air chamber can be interchanged; for example, the inner wall of the first bellows, the first seal, and the inner wall of the housing together enclose the second sealed gas chamber; the outer wall of the first corrugated pipe, the outer wall of the first sealing element, the outer wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly enclose the first sealed air chamber, and the first sealed air chamber is provided with an interface communicated with insulating gas of electrical equipment.
More preferably, the outer diameter of the first bellows is larger than the outer diameter of the second bellows.
More preferably, the signal adjusting mechanism comprises a moving rod, one end of the moving rod extends into the second bellows, is connected with the first sealing element and generates displacement along with the deformation of the first bellows; the other end of the moving rod extends out of the second corrugated pipe and is fixedly connected with a cross rod, the cross rod is provided with an adjusting screw, and the adjusting screw is used for triggering the signal generator under the driving force of the moving rod.
Preferably, the third pressure sensor is disposed within the third sealed air chamber; or the third pressure sensor is arranged on the third sealed air chamber and communicated with the air path of the third sealed air chamber.
Preferably, the signal generator comprises a microswitch or a magnetic auxiliary electric contact, and the gas density relay body outputs a contact signal through the signal generator.
Preferably, the gas density relay or the gas density detection device further comprises a second pressure sensor, and the second pressure sensor is communicated with a second sealed gas chamber filled with standard compensation gas.
Preferably, the intelligent control unit acquires gas density values acquired by the first pressure sensor and the temperature sensor; or, the intelligence accuse unit acquires the pressure value that first pressure sensor gathered and the temperature value that temperature sensor gathered accomplish the on-line monitoring of gas density relay to the gas density of the electrical equipment who monitors.
Preferably, the gas density relay or the gas density monitoring device further comprises a valve, one end of the valve is provided with a connecting port communicated with the atmosphere, and the other end of the valve is communicated with the pressure adjusting mechanism or the third sealed air chamber.
More preferably, the valve is further connected with the intelligent control unit and is closed or opened under the control of the intelligent control unit.
More preferably, the valve is an electric valve and/or an electromagnetic valve, or a piezoelectric valve, or a temperature-controlled valve, or a novel valve which is made of an intelligent memory material and is opened or closed by electric heating.
More preferably, upon verification, the valve is in an open state; when not verified, the valve is in a closed state.
Preferably, the pressure regulating mechanism is sealed within a chamber or housing.
Preferably, 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 third closed air chamber is increased or decreased; or,
the pressure adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with the third sealed air chamber; a piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod to further drive the piston to move in the cavity; or,
the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber and is in sealed contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the third sealed air chamber; or,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the third sealed air chamber, and the other end of the corrugated pipe stretches under the driving of the driving part; or,
the pressure adjusting mechanism is a deflation valve, and the deflation valve is an electromagnetic valve or an electric valve or a deflation valve realized in an electric or gas mode; or,
the pressure regulating mechanism is a compressor; or,
the pressure adjusting mechanism is a pump, and the pump comprises one of a pressurizing pump, an electric air pump and an electromagnetic air pump; or,
the pressure adjusting mechanism is a pressure increasing valve;
the driving part comprises one of a magnetic force, a motor, a reciprocating mechanism, a Carnot cycle mechanism, a magnetic coupling thrust mechanism, a heating thrust generation mechanism, an electric heating thrust generation mechanism, a chemical reaction thrust generation mechanism and a pneumatic element.
More preferably, when the pressure adjusting mechanism is a closed air chamber, the pressure adjusting mechanism further comprises a heat insulating member, and the heat insulating member is arranged outside the closed air chamber.
Preferably, the gas density relay body and the first pressure sensor are of an integrated structure; or the gas density relay body, the first pressure sensor and the temperature sensor are of a remote transmission type gas density relay with an integrated structure.
Preferably, the first pressure sensor and the temperature sensor are of an integrated structure; or the first pressure sensor and the temperature sensor are integrated gas density transmitters; or the first pressure sensor and the temperature sensor form a density detection sensor of quartz tuning fork technology; 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; preferably, the online check joint signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
Preferably, the first pressure sensor comprises at least one pressure sensor; or the first pressure sensor adopts a gas density transmitter consisting of a pressure sensor and a temperature sensor; or, the first pressure sensor adopts a density detection sensor of quartz tuning fork technology.
Preferably, the first pressure sensor is mounted on a 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.
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 online verification contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a gas density relay body, a pressure regulating mechanism or an intelligent control unit; in a non-checking state, the online checking contact signal sampling unit is relatively isolated from the contact signal of the gas density relay body on a circuit; in a checking state, the online checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay body, and connects the contact of the gas density relay body with the intelligent control unit; the isolation sampling element comprises one of a travel switch, a microswitch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler and a silicon controlled rectifier.
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 contact signal sampling unit is provided with at least two groups of independent sampling contacts, can automatically check at least two contacts simultaneously, and continuously measures without replacing the contacts or reselecting the contacts; wherein, the contact includes, but is not limited to one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure 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 gas density relay or the gas density monitoring device further comprises a multi-way joint, and the gas density relay body and the first pressure sensor are arranged on the multi-way joint; or,
the pressure adjusting mechanism is fixed on the multi-way joint; or,
the gas density relay body, the first pressure sensor and the pressure adjusting mechanism are arranged on the multi-way joint; or,
the online checking contact signal sampling unit, the intelligent control unit and the temperature sensor are arranged on the multi-way connector.
Preferably, the gas density relay or the gas density monitoring device further comprises a micro-water sensor connected with the intelligent control unit and/or a decomposition substance sensor connected with the intelligent control unit and/or the gas density relay.
Preferably, the online verification of the gas density relay is completed by at least two gas density relay bodies, at least two first pressure sensors, at least two third pressure sensors, at least two pressure adjusting mechanisms, at least two online verification contact signal sampling units, an intelligent control unit and a temperature sensor; or,
at least two gas density relay bodies, at least two first pressure sensors, at least two third pressure sensors, at least two pressure regulating mechanisms, at least two temperature sensors, at least two online check contact signal sampling units and an intelligent control unit are used for completing the online check of the gas density relay.
Preferably, the first pressure sensor or the third 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 pressure sensor or a digital pressure sensor.
Preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple.
Preferably, the 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 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.
Preferably, the gas density relay (or monitoring device) supports basic information input of the gas density relay (or monitoring device), and the basic information comprises one or more of 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 comprises one or more of an RS232 BUS, an RS422 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a PLC power carrier and a cable.
Furthermore, the wireless communication mode comprises 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 or the gas density monitoring device completes the online verification of the gas density relay according to the setting or the instruction of the background; or,
and completing the online verification of the gas density relay according to the set verification time of the gas density relay.
Preferably, the gas density relay or the gas density monitoring device further includes: 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 or the gas density monitoring device further includes: and the camera is used for monitoring.
Preferably, 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 body is isolated from a control loop of the gas density relay body, and when the contact signal 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 body.
Preferably, the gas density relay body or the gas density monitoring device further comprises 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 gas 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 utility model provides a pressure adjustment mechanism does not communicate with the main pneumatic circuit of SF6 of gas density relay body or electrical equipment mutually, but be linked together with the sealed air chamber of third of gas density relay body, effect through pressure adjustment mechanism, make the gas density relay body take place the contact action, the contact action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, the intelligence is controlled the unit and can be detected out the gas density relay body and take place the contact action, accomplish the check-up work of the contact signal action value of gas density relay body, need not maintainer to on-the-spot check-up, the whole life cycle intelligent management to gas density relay has been realized: the repair is carried out when the problem exists, and the operation and maintenance service is not needed when the problem does not exist. This application has improved the reliability of electric wire netting, and its sealed requirement of greatly reduced has improved efficiency, has reduced the operation maintenance cost, has improved the convenience and the flexibility of field installation, can realize the non-maintaining of gas density relay, and whole check-up process realizes the gaseous zero release of SF6 simultaneously, accords with the requirement of environmental protection regulation.
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 gas density relay with an online self-checking function according to a second embodiment;
fig. 3 is a schematic structural diagram of a gas density relay with an online self-checking function according to a third 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 gas density relay or gas density monitoring device with an online self-calibration function provided in this embodiment includes: gas density relay body 1, first pressure sensor 2, second pressure sensor 4, third pressure sensor 14, temperature sensor 3, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, many-way joint 9 and valve 12. Gas density relay body 1, pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6 and intelligent control unit 7 set up on many logical joint 9.
The gas density relay body 1 mainly includes: a housing, a first bellows 104, a second bellows 103, a signal generator (in this embodiment, a microswitch) 102, and a signal adjusting mechanism 101. A first open end of the first bellows 104 is fixed on the inner wall of the housing, a second open end of the first bellows 104 is connected with the first sealing element 108 in a sealing manner, the inner wall of the first bellows 104, the first sealing element 108 and the inner wall of the housing together enclose a first sealed air chamber G1, and the first sealed air chamber G1 is filled with a material having a density value P20BCI.e., the first sealed gas cell G1 in this embodiment is a temperature compensated standard gas cell. The second pressure sensor 4 is in communication with the first sealed gas cell G1 for collecting the gas pressure within the first sealed gas cell G1. A first opening end of the second bellows 103 is connected with the first sealing element 108 in a sealing manner, a second opening port of the second bellows 103 is fixedly connected with an inner wall of the housing through a second sealing element 109, an outer wall of the first bellows 104, the first sealing element 108, an outer wall of the second bellows 103, the second sealing element 109 and the inner wall of the housing jointly enclose a second sealing air chamber G2, and the second sealing air chamber G2 is communicated with the electrical equipment connector 13 through the multi-way connector 9, that is, the second sealing air chamber G2 is communicated with the insulating gas of the electrical equipment. The inner wall of the second bellows 103, the second sealing member 109 and the inner wall of the housing together enclose a third sealed air chamber G3, and the third pressure sensor 14 is disposed in the third sealed air chamber G3. The signal conditioning mechanism 101 and the signal generator 102 are disposed in the third sealed air chamber G3, the signal conditioning mechanism 101 is connected to the first sealing member 108, the signal generator 102 is disposed corresponding to the signal conditioning mechanism 101, and the gas is supplied to the third sealed air chamber G3The bulk density relay body 1 outputs a contact signal through the signal generator 102. In this embodiment, the signal adjusting mechanism 101 includes a movable rod, one end of the movable rod extends into the second bellows 103, is connected to the first sealing element 108, and is displaced along with the deformation of the first bellows 104; the other end of the moving rod extends out of the second corrugated pipe 103 and is fixedly connected with a cross rod (or a plate), and the cross rod (or the plate) is provided with a plurality of adjusting screws 10101. When the gas pressure in the third sealed gas chamber G3 changes, the balance of the forces acting on the upper end surface of the first bellows 104 by the first sealed gas chamber G1 and the third sealed gas chamber G3 is broken, so that the first bellows 104 is deformed along with the pressure change to generate a certain displacement, the moving rod 101 is driven to move, the moving rod 101 drives the adjusting screw 10101 to trigger the button of the signal generator 102, and the signal generator 102 sends out an alarm and locking signal.
In the present embodiment, the first pressure sensor 2 is in communication with the second airtight gas chamber G2 of the gas density relay body 1; the second pressure sensor 4 is communicated with the first sealed air chamber G1 of the gas density relay body 1; the third pressure sensor 14 communicates with a third airtight chamber G3 of the gas density relay body 1. The pressure adjusting mechanism 5 is disposed outside the gas density relay body 1, and an air passage of the pressure adjusting mechanism 5 communicates with the third sealed air chamber G3, and is configured to adjust the gas pressure of the third sealed air chamber G3, so that the gas density relay body 1 generates a contact signal operation. The online check contact signal sampling unit 6 is directly or indirectly connected with the signal generator 102 of the gas density relay body 1, and is configured to sample a contact signal of the gas density relay body 1, which generates a contact signal action, where the contact signal includes an alarm and/or a lock. The intelligence accuse unit 7 is connected with pressure adjustment mechanism 5, first pressure sensor 2, second pressure sensor 4, third pressure sensor 14, temperature sensor 3 and online check-up contact signal sampling unit 6 respectively, is configured to the completion pressure adjustment mechanism 5's control, pressure value collection and temperature value collection and/or gas density value collection, and detect gas density relay body 1's contact signal action value and/or contact signal return value. The third pressure sensor 14 may be disposed on the third sealed air chamber G3, or the third pressure sensor 14 may be disposed on the pressure adjusting mechanism 5 or on the air path connected to the third sealed air chamber G3. In summary, the third pressure sensor 14 is in communication with the third plenum G3 on the pneumatic circuit.
The pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 51, a piston 52, a seal ring 53, a connecting rod 54, and a drive member 55. The airbag 51 communicates with the third airtight gas chamber G3 of the gas density relay body 1. The pressure adjusting mechanism 5, under the control of the intelligent control unit 7, enables the driving member 55 to push the connecting rod 54, further push the piston 52, further push the air bag 51 to change in volume, and complete the lifting of the gas pressure of the third sealing air chamber G3. The driving member 55 includes, but is not limited to, one of a magnetic force, a motor, a reciprocating mechanism, a carnot cycle mechanism, a magnetic coupling thrust mechanism, a heating thrust mechanism, an electric heating thrust mechanism, a chemical reaction thrust mechanism, and a pneumatic element.
A valve 12 is arranged on an air path connecting the pressure regulating mechanism 5 and the third sealed air chamber G3 of the gas density relay body 1, specifically, one end of the valve 12 is communicated with the third sealed air chamber G3 and the air bag 51 of the pressure regulating mechanism 5, and the other end is provided with a protective cover 1201. The valve 12 is an electric valve and/or an electromagnetic valve, or a piezoelectric valve, or a temperature-controlled valve, or a novel valve which is made of an intelligent memory material and is opened or closed by electric heating. In the non-verification state, the valve 12 is in the closed state; during verification, the valve 12 is open.
Of course, the positions of the first and second plenums in this embodiment may be interchanged. For example, the inner wall of the first bellows 104, the first sealing member 108, and the inner wall of the housing together define the second sealed air chamber, and the second sealed air chamber is filled with a material having a density of P20BCThe standard compensation gas of (4); the outer wall of the first bellows 104, the first seal 108, and the outer wall of the second bellows 103The second sealing element 109 and the inner wall of the housing together enclose the first sealed air chamber, and the first sealed air chamber is provided with an interface communicated with the insulating gas of the electrical equipment. Specifically, the positions of the first and second airtight chambers can be flexibly designed as required.
The working principle is as follows:
the intelligent control unit 7 monitors the gas pressure and the temperature of the electrical equipment according to the first pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P20The gas density values (namely, the gas density values) can be remotely transmitted and monitored on line, namely, the intelligent control unit 7 acquires the gas density values acquired by the first pressure sensor 2 and the temperature sensor 3; or, intelligence accuse unit 7 acquires the pressure value and the temperature value that first pressure sensor 2, temperature sensor 3 gathered accomplish the on-line monitoring of gas density relay to the gas density of the electrical equipment who monitors. Meanwhile, the intelligent control unit 7 acquires the gas density values acquired by the third pressure sensor 14 and the temperature sensor 3; or, the intelligent control unit 7 acquires the pressure value collected by the third pressure sensor 14 and the temperature value collected by the temperature sensor 3, and completes the online monitoring of the gas density value of the third sealing gas chamber G3. At this time, the gas density value of the first sealed gas chamber G1 is greater than the gas density value of the third sealed gas chamber G3, that is, the difference between the gas density value of the first sealed gas chamber G1 and the gas density value of the third sealed gas chamber G3 is greater than a certain set value, as can be seen from fig. 1, there is a corresponding distance between the adjusting screw 10101 of the signal adjusting mechanism 101 and the signal generator 102, and at this time, the adjusting screw 10101 does not contact the signal generator 102, that is, the trigger signal generator 102 is not activated, the signal generator 102 is not activated, and the contact point signal is not output.
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 sends an instruction, 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 when the gas density relay body is checked, orThe control loop is locked. Because the gas density value P of the gas density relay is already carried out before the calibration is started20Not less than set safety check density value PSThe gas of the electrical equipment is in a safe operation range, and the gas leakage is a slow process and is safe during verification. Meanwhile, the intelligent control unit 7 is communicated with a contact sampling circuit of the gas density relay body 1.
Then, the valve 12 is opened by the intelligent control unit 7, so that the third sealing air chamber G3 of the gas density relay body 1 is communicated with the air passage of the pressure adjusting mechanism 5 on the air passage. Then, the intelligent control unit 7 controls the driving part 55 of the pressure adjusting mechanism 5 (which can be implemented mainly by using a motor and a gear, and is various and flexible in manner), and then adjusts the piston 52 of the pressure adjusting mechanism 5, so that the sealed cavity formed by the piston 52, the air bag 51, and the third sealed air chamber G3 of the gas density relay body 1 changes in volume (reduces in volume), the pressure of the gas in the third sealed air chamber G3 of the gas density relay body 1 gradually rises, the pressure acting on the upper end surface of the first bellows 104 increases, so that the upper end surface of the first bellows 104 and the moving rod driving the adjusting screw 10101 displace downward, the distance between the adjusting screw 10101 and the signal generator 102 decreases, when the distance is smaller than a corresponding value, the adjusting screw 10101 of the signal adjusting mechanism 101 contacts the signal generator 102, i.e. the trigger signal generator 102, the contacts of the signal generator 102 are activated (switched on) and a corresponding contact signal is emitted (alarm or latch). The contact action is uploaded to an intelligent control unit 7 through an online checking contact signal sampling unit 6, the intelligent control unit 7 obtains a pressure value P1 acquired by a first pressure sensor 2 and a temperature value T acquired by a temperature sensor 3 when the contact signal action or switching occurs on the gas density relay body 1, and a pressure value P3 acquired by a third pressure sensor 14, and an equivalent gas pressure value P is calculated according to the pressure value P1 and the pressure value P3; according to the equivalent gas pressure value P and the gas pressure-temperature characteristic, the equivalent gas pressure value P is converted into a pressure value corresponding to 20 ℃, namely a gas density value P20And completing the online verification of the gas density relay. Or, the intelligent control sheetThe element 7 acquires a gas density value P1 acquired by the first pressure sensor 2 and the temperature sensor 3 when the gas density relay body 1 generates contact signal action or switching20And a gas density value P3 acquired by the third pressure sensor 14 and the temperature sensor 320And according to the gas density value P120And a gas density value P320Calculating to obtain a gas density value P20And completing the online verification of the gas density relay. Further, when the gas density relay body 1 generates contact signal operation or switching, the equivalent gas pressure value P is P1-P3; according to the equivalent gas pressure value P and the gas pressure-temperature characteristic, the equivalent gas pressure value P is converted into a pressure value corresponding to 20 ℃, namely a gas density value P20Completing the online calibration of the gas density relay; or when the gas density relay body 1 generates contact signal action or switching, the equivalent gas pressure value P is P1-P3K, wherein K is a preset coefficient and is obtained according to the characteristics of the density relay body; converting into pressure value of 20 deg.C, i.e. gas density value P, according to the equivalent gas pressure value P, temperature value T and gas pressure-temperature characteristic20And completing the online verification of the gas density relay. Alternatively, the gas density value P of the gas density relay body 1 may be set when the contact signal is activated or switched20And a gas density value P120、P320The corresponding relation between the gas density values is designed into a data table and is according to the gas density value P120And a gas density value P320Inquiring the data table to obtain the corresponding gas density value P20Completing the online calibration of the gas density relay; or, when the gas density relay body 1 generates contact signal action or switching, its gas density value P20The corresponding relations between the gas pressure values P1, P3 and the temperature value T are designed into a data table, and the data table is inquired according to the gas pressure values P1, P3 and the temperature value T to obtain the corresponding gas density value P20And completing the online verification of the gas density relay. For example, with the calibrated SF6 gas density relay parameters: rated pressure value of 0.7MPa, alarm pressure value of 0.65MPa, and lock-out pressure value of 0.60MPa (abs.) as examplesAnd (4) adding the active ingredients. Assuming that the temperature T of the verification is 10 ℃, when the verification is initiated, the intelligent control unit 7 detects the gas pressure value P of the first sealed gas chamber G1 (i.e., the temperature compensation standard gas chamber)BCCS0.6186MPa (abs.) corresponding to a gas density value of P20BCCS0.645MPa (abs.). Assuming that when the checking alarm contact signal acts, the pressure value P1 acquired by the first pressure sensor 2 and the temperature sensor 3 is 0.6756MPa, the temperature value T is 10 ℃, and the pressure value P3 acquired by the third pressure sensor 14 is 0.11MPa, the preset coefficient K is 0.5 according to the characteristics of the density relay body; then the equivalent gas pressure value P-P1-P3K-0.6756-0.11 0.5-0.6206 MPa (abs.); the equivalent gas pressure value P is 0.6206MPa (abs.) and is converted into a pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely, the action value P of the alarm contactBJD200.6471MPa (abs.), and the error is 0.6471-0.65-0.0029 MPa, thus conveniently completing the online verification of the alarm contact of the gas density relay; assuming that, when the verification lock contact signal is activated, the pressure value P1 ═ 0.6756MPa and the temperature value T ═ 10 ℃ collected by the first pressure sensor 2 and the temperature sensor 3, and the pressure value P3 ═ 0.182MPa collected by the third pressure sensor 14, and the equivalent gas pressure value P ═ P1-P3 ═ K ═ 0.6756-0.182 ═ 0.5 ═ 0.5846MPa (abs.); converting the equivalent gas pressure value P to 0.5846MPa (abs) and SF6 gas pressure-temperature characteristic to a pressure value corresponding to 20 ℃, namely, an action value P of the alarm point is reportedBSD20The error is 0.6093MPa (abs.), and the error is 0.6093-0.60 ═ 0.0093MPa, so the online verification of the latching contact of the gas density relay is conveniently completed. 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 driving part 55 of the pressure adjusting mechanism 5 is controlled by the intelligent control unit 7, and then the piston 52 of the pressure adjusting mechanism 5 is adjusted, so that the volume of the sealed cavity formed by the third sealed air chamber G3 of the piston 52, the air bag 51 and the gas density relay body 1 is changed (increased), the pressure of the gas in the third sealed air chamber G3 of the gas density relay body 1 is gradually reduced, and the pressure acting on the upper end surface of the first corrugated pipe 104 is reduced. After the gas density value of the third sealed gas chamber G3 is adjusted to a predetermined set value, the gas pressure in the first sealed gas chamber G1 is greater than the gas pressure in the third sealed gas chamber G3, which pushes the upper end surface of the first bellows 104 and the moving rod provided with the adjusting screw 10101 to move upward, so that a corresponding distance exists between the adjusting screw 10101 and the signal generator 102, the adjusting screw 10101 does not contact the signal generator 102, and at the same time, the intelligent control unit 7 immediately closes the valve 12, so that the third sealed gas chamber G3 of the gas density relay body 1 is not communicated with the pressure adjusting mechanism 5 on the 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 short, after the gas density relay completes the online verification work, if an abnormality occurs, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the gas density relay completes the calibration work, if there is an abnormality, 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, etc.), 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 types of the first pressure sensor 2 and the third pressure sensor 14 are as follows: 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 (such as a pressure measurement sensor with induction coil of a Badon tube), a resistance pressure sensor (such as a pressure measurement sensor with slide wire resistance of a Badon tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).
The temperature sensor 3 may be: a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.
The valve 12 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 12 may be driven in an automatic, power actuated, or manual manner. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric motor (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 online check contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification. When the contact signal of the gas density relay body 1 acts during the calibration, the safe operation of the electrical equipment cannot be influenced; 2) the contact signal control loop of the gas density relay body 1 does not influence the performance of the gas density relay, particularly does not influence the performance of the intelligent control unit 7, and does not cause the gas density relay to be damaged or influence the test work.
The basic requirements or functions of the intelligent control unit 7 are as follows: the intelligent control unit 7 is used for controlling the valve 12, controlling the pressure regulating mechanism 5 and acquiring signals. The realization is as follows: can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 acts, and convert the pressure value and temperature value into the corresponding pressure value P at 20 DEG C20(density value), that is, the contact operating value P of the gas density relay body 1 can be detectedD20And the calibration work of the gas density relay body 1 is completed. Alternatively, the density value P at the time of the contact signal operation of the gas density relay body 1 can be directly detectedD20And the calibration work of the gas density relay body 1 is completed.
Of course, the intelligent control unit 7 can also realize: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 7 further comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value output signal of gas density relay body 1, the density value at that time is gathered simultaneously to intelligence accuse unit 7, accomplishes the rated pressure value check-up of gas density relay body 1. Meanwhile, the self-checking work among the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay body 1, and the maintenance-free operation is realized.
Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas insulated cabinets, ring main units, and the like.
Gas density relay body 1, first pressure sensor 2, temperature sensor 3, valve 12, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7 and the multi-pass joint 9 between can set up in a flexible way as required. For example, the gas density relay body 1, the first pressure sensor 2, and the temperature sensor 3 may be provided together; or the valve 12 and the pressure regulating mechanism 5 may be provided together. In short, the arrangement between them can be flexibly arranged and combined.
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. 2, the second embodiment of the present invention provides a gas density relay or gas density monitoring device with an online self-calibration function, including: the gas density relay comprises a gas density relay body 1, a first pressure sensor 2, a third pressure sensor 14, a temperature sensor 3, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9 and a valve 12. The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the multi-way connector 9; the third pressure sensor 14 is disposed within the third sealed gas chamber G3, or the third pressure sensor 14 is disposed above the third sealed gas chamber G3 in communication with the third sealed gas chamber G3.
The difference from the first embodiment is that:
1) the first sealed air chamber G1 in this embodiment communicates with the electrical equipment connector 13 through the multi-way connector 9, that is, the first sealed air chamber G1 communicates with the insulating gas of the electrical equipment. The second air-tight chamber G2 in this embodiment is filled with a density value P20BCI.e., the second sealed gas cell G2, is a temperature compensated standard gas cell.
2) The pressure adjusting mechanism 5 of this embodiment is a cavity 51 with an opening at one end, a piston 52 is arranged in the cavity 51, the piston 52 is provided with a sealing ring 53, one end of the piston 52 is connected with an adjusting rod 54, the outer end of the adjusting rod 54 is connected with a driving part 55, the other end of the piston 52 extends into the opening and contacts with the inner wall of the cavity 51, and the driving part 55 drives the adjusting rod 54 to further drive the piston 52 to move in the cavity 51. The driving member 55 includes, but is not limited to, one of a magnetic force, a motor, a reciprocating mechanism, a carnot cycle mechanism, a magnetic coupling thrust mechanism, a heating thrust mechanism, an electric heating thrust mechanism, a chemical reaction thrust mechanism, and a pneumatic element. In a preferred embodiment, the pressure adjustment mechanism 5 further comprises a sealing member coupling 58, wherein the sealing member coupling 58 is arranged between the chamber 51 and the driving member 55, such that the adjustment rod 54 is connected to the driving member 55 through the sealing member coupling 58, ensuring a good sealing performance of the entire pressure adjustment mechanism 5. The seal coupling 58 includes, but is not limited to, one of a bellows, a bladder, and a seal ring.
Example three:
as shown in fig. 3, the third embodiment of the present invention provides a gas density relay or gas density monitoring device with an online self-calibration function, including: the gas density relay comprises a gas density relay body 1, a first pressure sensor 2, a third pressure sensor 14, a temperature sensor 3, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9 and a valve 12. The gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 are arranged on the multi-way joint 9; the third pressure sensor 14 is disposed within the third sealed gas chamber G3, or the third pressure sensor 14 is disposed above the third sealed gas chamber G3 in communication with the third sealed gas chamber G3.
The difference from the second embodiment is that:
1) the valve 12 and the pressure adjustment mechanism 5 are independently communicated with the third airtight chamber G3.
2) The pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 51 and a drive member 55. The pressure adjusting mechanism 5 makes the driving member 55 push the air bag 51 to change the volume according to the control of the intelligent control unit 7, thereby completing the lifting of the gas pressure of the third sealed air chamber G3. Wherein, online check-up contact signal sampling unit 6, intelligent control unit 7 and pressure adjustment mechanism 5 set up together.
In another preferred embodiment, the pressure regulating mechanism 5 may also be a solenoid valve sealed inside a housing. The pressure adjusting mechanism 5 opens the electromagnetic valve to generate pressure change according to the control of the intelligent processor 7, and then the lifting of the gas pressure of the third sealed gas chamber G3 is completed.
In another preferred embodiment, the pressure adjusting mechanism 5 may also be composed of a bellows and a driving component, and the bellows is connected with the third sealed gas chamber G3 of the gas density relay body 1 in a sealing manner to form a reliable sealed cavity. The pressure adjusting mechanism 5 drives the bellows to change the volume according to the control of the intelligent processor 7, so that the sealed cavity changes the volume, and the lifting of the gas pressure of the third sealed gas chamber G3 is completed.
In another preferred embodiment, the pressure adjusting mechanism 5 may further comprise a gas chamber, a heating element, and a thermal insulation member, the gas chamber is hermetically connected to the third sealed gas chamber G3 of the gas density relay body 1, and the heating element is provided outside (or inside) the gas chamber, and the heating element causes a temperature change by heating, thereby completing the rise and fall of the gas pressure of the third sealed gas chamber G3.
Of course, the pressure adjusting mechanism 5 may have various other forms, which are not limited to the above-mentioned forms, and other mechanisms capable of realizing the pressure lifting function are also covered in the protection scope of the present application.
To sum up, pressure adjustment mechanism 5 of this application is not the SF6 main gas circuit with gas density relay body 1 or electrical equipment and communicates mutually, but be linked together with the third sealed air chamber G3 of gas density relay body 1, effect through pressure adjustment mechanism 5, make gas density relay body 1 take place the contact action, the contact action transmits intelligence through online check-up contact signal sampling unit 6 and controls unit 7, intelligence is controlled unit 7 and can be detected out gas density relay body 1 and takes place the contact action, accomplish the check-up work of the contact signal action value of gas density relay body, need not maintainer to on-the-spot check-up, the whole life cycle intelligent management to gas density relay has been realized: the repair is carried out when the problem exists, and the operation and maintenance service is not needed when the problem does not exist. The application improves the reliability of the power grid, greatly reduces the sealing requirement, improves the efficiency, reduces the cost, improves the convenience and the flexibility of field installation, can realize the maintenance-free performance of the gas density relay, and simultaneously, the whole check is carried outImplementation of the procedure SF6Zero emission of gas and meeting the requirements of environmental protection regulations.
The application carries out technical innovation: the pressure regulating mechanism is not communicated with the gas density relay body or the SF6 main gas circuit of the electrical equipment, so that the reliability of the power grid is greatly improved, the sealing requirement of the power grid is reduced, the manufacturing cost can be greatly reduced, and the convenience and the flexibility of field installation are improved.
It should be noted that, a gas density relay with an online self-checking function generally means that its constituent elements are designed into an integral structure; the gas density monitoring device generally refers to that the components of the gas density monitoring device are designed into a split structure and flexibly formed. The gas density relay can be technically improved by utilizing the original gas density relay of the transformer substation.
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 (21)
1. A gas density relay with an online self-checking function is characterized by comprising: the intelligent control system comprises a gas density relay body, a first pressure sensor, a third pressure sensor, a temperature sensor, a pressure adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;
the gas density relay body includes: the air conditioner comprises a shell, a first sealed air chamber, a second sealed air chamber and a third air chamber, wherein the first sealed air chamber, the second sealed air chamber and the third air chamber are communicated with an insulating air chamber of electrical equipment;
the first pressure sensor is communicated with the first sealed air chamber;
the third pressure sensor is communicated with a third sealed air chamber of the gas density relay body;
the pressure adjusting mechanism is arranged outside the gas density relay body, and a gas path of the pressure adjusting mechanism is communicated with the third sealed gas chamber and is configured to adjust the gas pressure of the third sealed gas chamber to rise and fall so as to enable the gas density relay body to generate contact signal action;
the online check contact signal sampling unit is connected with the signal generator of the gas density relay body and is configured to sample a contact signal of the gas density relay body, which generates a contact signal action;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the first pressure sensor, the third pressure sensor, the temperature sensor and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detect 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, wherein the gas density relay body comprises: the device comprises a shell, a first corrugated pipe, a second corrugated pipe, a signal generator and a signal adjusting mechanism; the first opening end of the first corrugated pipe is fixed on the inner wall of the shell, the second opening end of the first corrugated pipe is connected with the first sealing element in a sealing mode, the inner wall of the first corrugated pipe, the first sealing element and the inner wall of the shell jointly enclose the first sealed air chamber, and the first sealed air chamber is provided with an interface communicated with insulating gas of electrical equipment; a first opening end of the second corrugated pipe is connected with the first sealing element in a sealing mode, a second opening port of the second corrugated pipe is connected with the inner wall of the shell through a second sealing element, and the outer wall of the first corrugated pipe, the first sealing element, the outer wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly enclose the second sealed air chamber; the inner wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly enclose a third sealed air chamber, the signal generator and the signal adjusting mechanism are arranged in the third sealed air chamber, the signal adjusting mechanism is connected with the first sealing element, and the signal generator is arranged corresponding to the signal adjusting mechanism.
3. A gas density relay with an on-line self-checking function according to claim 2, characterized in that: the outer diameter of the first bellows is larger than the outer diameter of the second bellows.
4. A gas density relay with an on-line self-checking function according to claim 2, characterized in that: the signal adjusting mechanism comprises a moving rod, one end of the moving rod extends into the second corrugated pipe, is connected with the first sealing element and generates displacement along with the deformation of the first corrugated pipe; the other end of the moving rod extends out of the second corrugated pipe and is fixedly connected with a cross rod, the cross rod is provided with an adjusting screw, and the adjusting screw is used for triggering the signal generator under the driving force of the moving rod.
5. The gas density relay with the online self-checking function according to claim 1, characterized in that: the third pressure sensor is arranged in the third sealed air chamber; or the third pressure sensor is arranged on the third sealed air chamber and communicated with the air path of the third sealed air chamber.
6. The gas density relay with the online self-checking function according to claim 1, characterized in that: the signal generator comprises a microswitch or a magnetic auxiliary electric contact, and the gas density relay body outputs a contact signal through the signal generator.
7. The gas density relay with the online self-checking function according to claim 1, characterized in that: and the second pressure sensor is communicated with the first sealed gas chamber or the second sealed gas chamber filled with standard compensation gas.
8. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit acquires gas density values acquired by the first pressure sensor and the temperature sensor; or, the intelligence accuse unit acquires the pressure value that first pressure sensor gathered and the temperature value that temperature sensor gathered accomplish the on-line monitoring of gas density relay to the gas density of the electrical equipment who monitors.
9. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit obtains a pressure value P1 acquired by the first pressure sensor, a temperature value T acquired by the temperature sensor and a pressure value P3 acquired by the third pressure sensor when the contact signal action or switching occurs on the gas density relay body, and calculates an equivalent gas pressure value P according to the pressure value P1 and the pressure value P3; according to the equivalent gas pressure value P and the gas pressure-temperature characteristic, the equivalent gas pressure value P is converted into a pressure value corresponding to 20 ℃, namely a gas density value P20Completing the online calibration of the gas density relay; or,
the intelligence accuse unit acquires when gas density relay body takes place contact signal action or switches gas density value P1 that first pressure sensor and temperature sensor gathered20And a gas density value P3 collected by the third pressure sensor and the temperature sensor20And according to the gas density value P120And a gas density value P320Calculating to obtain a gas density value P20And completing the online verification of the gas density relay.
10. The gas density relay with the online self-checking function according to claim 1, characterized in that: the pressure regulating mechanism is characterized by further comprising a valve, a connecting port communicated with the atmosphere is formed in one end of the valve, and the other end of the valve is communicated with the pressure regulating mechanism or the third sealed air chamber.
11. The gas density relay with the online self-checking function according to claim 1, characterized in that: 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 third closed air chamber is increased or decreased; or,
the pressure adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with the third sealed air chamber; a piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod to further drive the piston to move in the cavity; or,
the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber and is in sealed contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the third sealed air chamber; or,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the third sealed air chamber, and the other end of the corrugated pipe stretches under the driving of the driving part; or,
the pressure adjusting mechanism is a deflation valve which comprises an electromagnetic valve or an electric valve; or,
the pressure regulating mechanism is a compressor; or,
the pressure adjusting mechanism is a pump, and the pump comprises one of a pressurizing pump, an electric air pump and an electromagnetic air pump; or,
the pressure adjusting mechanism is a pressure increasing valve;
the driving part comprises one of a magnetic force, a motor, a reciprocating mechanism, a Carnot cycle mechanism, a magnetic coupling thrust mechanism, a heating thrust generation mechanism, an electric heating thrust generation mechanism, a chemical reaction thrust generation mechanism and a pneumatic element.
12. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body and the first pressure sensor are of an integrated structure; or the gas density relay body, the first pressure sensor and the temperature sensor are of a remote transmission type gas density relay with an integrated structure.
13. The gas density relay with the online self-checking function according to claim 1, characterized in that: the first pressure sensor and the temperature sensor are of an integrated structure; or the first pressure sensor and the temperature sensor are integrated gas density transmitters; or, the first pressure sensor and the temperature sensor form a density detection sensor of quartz tuning fork technology.
14. 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.
15. The gas density relay with the online self-checking function according to claim 1, characterized in that: the first pressure sensor comprises at least one pressure sensor; or the first pressure sensor adopts a gas density transmitter consisting of a pressure sensor and a temperature sensor; or, the first pressure sensor adopts a density detection sensor of quartz tuning fork technology.
16. The gas density relay with the online self-checking function according to claim 1, characterized in that: the first 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.
17. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online check contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a gas density relay body, a pressure regulating mechanism or an intelligent control unit; in a non-checking state, the online checking contact signal sampling unit is relatively isolated from the contact signal of the gas density relay body on a circuit through an isolation sampling element; in a checking state, the online checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay body through an isolation sampling element, and connects the contact of the gas density relay body with the intelligent control unit; the isolation sampling element comprises one of a travel switch, a microswitch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler and a silicon controlled rectifier.
18. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body and the first pressure sensor are arranged on the multi-way joint; or,
the pressure adjusting mechanism is fixed on the multi-way joint; or,
the gas density relay body, the first pressure sensor and the pressure adjusting mechanism are arranged on the multi-way joint; or,
the online checking contact signal sampling unit, the intelligent control unit and the temperature sensor are arranged on the multi-way connector.
19. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online calibration method comprises the following steps that at least two gas density relay bodies, at least two first pressure sensors, at least two third pressure sensors, at least two pressure adjusting mechanisms, at least two online calibration contact signal sampling units, an intelligent control unit and a temperature sensor are used for completing online calibration of the gas density relay; or,
at least two gas density relay bodies, at least two first pressure sensors, at least two third pressure sensors, at least two pressure regulating mechanisms, at least two temperature sensors, at least two online check contact signal sampling units and an intelligent control unit are used for completing the online check of the gas density relay.
20. 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.
21. 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 1-20; or, the gas density monitoring device comprises a gas density relay with an online self-checking function as claimed in any one of claims 1-20.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218290A1 (en) * | 2020-04-29 | 2021-11-04 | 上海乐研电气有限公司 | Gas density relay with online self-checking function, and checking method therefor |
| CN117470711A (en) * | 2023-12-28 | 2024-01-30 | 国网江西省电力有限公司电力科学研究院 | Intelligent gas density monitoring device with self-checking function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218290A1 (en) * | 2020-04-29 | 2021-11-04 | 上海乐研电气有限公司 | Gas density relay with online self-checking function, and checking method therefor |
| CN117470711A (en) * | 2023-12-28 | 2024-01-30 | 国网江西省电力有限公司电力科学研究院 | Intelligent gas density monitoring device with self-checking function |
| CN117470711B (en) * | 2023-12-28 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | Intelligent gas density monitoring device with self-checking function |
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