CN212136344U - 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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- CN212136344U CN212136344U CN202020687231.5U CN202020687231U CN212136344U CN 212136344 U CN212136344 U CN 212136344U CN 202020687231 U CN202020687231 U CN 202020687231U CN 212136344 U CN212136344 U CN 212136344U
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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, first pressure sensor, temperature sensor, force cell sensor, order about contact actuating mechanism and intelligence accuse unit. Order about contact actuating mechanism and be configured as directly or indirectly order about the signal actuating mechanism of gas density relay body takes place the displacement, makes the gas density relay body takes place the contact signal action, and the density value when the unit is controlled according to the contact action to the intelligence detects out the warning of gas density relay body and/or shutting contact signal action value and/or return value, need not the maintainer to the check-up work that just can accomplish gas density relay on-the-spot, has improved the reliability of electric wire netting, has improved efficiency, has reduced the operation maintenance cost, can realize the non-maintaining of gas density relay.
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 digitization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring of the gas density and micro-water content states of electrical equipment such as SF6 and the like has important practical significance. 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 gas density relay comprises a gas density relay body, a first pressure sensor, a temperature sensor, a force measuring sensor, a driving contact action mechanism and an intelligent control unit;
the gas density relay body includes: the temperature compensation device comprises a shell, a pressure detection element, a temperature compensation element, a signal generator and a signal action mechanism, wherein the pressure detection element, the temperature compensation element, the signal generator and the signal action mechanism are arranged in the shell;
the first pressure sensor is communicated with the pressure detection element of the gas density relay body;
the driving contact actuating mechanism is arranged in the shell or outside the shell and comprises a force application mechanism and a movement mechanism, the force application mechanism comprises a driving part and a force transmission part driven by the driving part, the movement mechanism comprises a push rod, the push rod moves under the driving of the force application mechanism, and the signal actuating mechanism is directly or indirectly displaced to trigger the signal generator to generate a contact signal to act;
the force measuring sensor is arranged on the actuating contact actuating mechanism or in the shell and is configured to detect the force applied by the actuating contact actuating mechanism to the gas density relay body;
the intelligent control unit is respectively connected with the driving contact action mechanism, the first pressure sensor, the temperature sensor and the force measuring sensor and is configured to complete control of the driving contact action mechanism, pressure value collection, temperature value collection and/or gas density value collection, or/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 first pressure sensor, a temperature sensor, a force measuring sensor, a driving contact action mechanism and an intelligent control unit;
the gas density relay body includes: the temperature compensation device comprises a shell, a pressure detection element, a temperature compensation element, a signal generator and a signal action mechanism, wherein the pressure detection element, the temperature compensation element, the signal generator and the signal action mechanism are arranged in the shell;
the first pressure sensor is communicated with the pressure detection element of the gas density relay body;
the driving contact actuating mechanism is arranged in the shell or outside the shell and comprises a force application mechanism and a movement mechanism, the force application mechanism comprises a driving part and a force transmission part driven by the driving part, the movement mechanism comprises a push rod, the push rod moves under the driving of the force application mechanism, and the signal actuating mechanism is directly or indirectly displaced to trigger the signal generator to generate a contact signal to act;
the force measuring sensor is arranged on the actuating contact actuating mechanism or in the shell and is configured to detect the force applied by the actuating contact actuating mechanism to the gas density relay body;
the intelligent control unit is respectively connected with the driving contact action mechanism, the first pressure sensor, the temperature sensor and the force measuring sensor and is configured to complete control of the driving contact action mechanism, pressure value collection, temperature value collection and/or gas density value collection, or/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 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 temperature compensation element adopts a temperature compensation sheet or gas enclosed in the shell.
Preferably, the pressure detecting element comprises a bourdon tube or a bellows.
Preferably, the load cell comprises one of a gravity sensor, a pressure sensor, a magnetic sensor, a displacement sensor, a deformation sensor, a photoelectric sensor, an angle sensor, and a camera.
Preferably, the driving part comprises one of a magnetic force, gravity, a motor, a reciprocating mechanism, a carnot cycle mechanism, an air compressor, a vent valve, a pressurizing pump, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust generation mechanism, an electric heating thrust generation mechanism and a chemical reaction thrust generation mechanism.
Preferably, the force transfer member comprises one of a cam, a connecting rod, a spring, a metallic member, a non-metallic member, a telescoping member, and a non-telescoping member.
Preferably, the force measuring sensor is arranged on a push rod driving the contact actuating mechanism; or,
the force sensor is arranged on the pressure detection element; or,
the force sensor is arranged on the temperature compensation element; or,
the force sensor is arranged on the signal action mechanism.
Preferably, the gas density relay body further comprises a base, an end seat and a movement which are arranged in the shell; the movement is fixed on the base; the pressure detection element is a bourdon tube filled with sealed gas, one end of the pressure detection element is fixed on the base and communicated with the base, the other end of the pressure detection element is connected with one end of the temperature compensation element through the end seat, and the other end of the temperature compensation element is provided with a signal action mechanism; the signal action mechanism is provided with an adjusting screw or a trigger piece which pushes the signal generator and enables the contact of the signal generator to be connected or disconnected, and the gas density relay body outputs a contact signal through the signal generator; the driving contact actuating mechanism is arranged outside the shell of the gas density relay body and also comprises an outer cover provided with an opening, the outer cover is fixedly connected to the shell, the opening faces the shell, and the driving part, the force transmission part and the push rod are arranged in the outer cover; or the driving contact actuating mechanism is arranged in the shell of the gas density relay body.
More preferably, a fixing piece is arranged at one end of the push rod facing the force application mechanism, the fixing piece is fixed in the outer cover, the other end of the push rod penetrates through a fixing frame fixed at an opening of the outer cover, and the end part of the push rod penetrating through the fixing frame extends into the shell from an air hole in the shell of the gas density relay body; the end seat in the shell is provided with an end seat contact plate, and the end part of the push rod extending into the shell is opposite to the end seat contact plate.
Further, the load cell is connected with the push rod through a contact member, or the load cell is directly connected with the push rod.
Furthermore, a return spring is sleeved on the push rod between the fixing piece and the fixing frame.
Furthermore, the force transmission piece is a cam, the end surface of the cam, which is opposite to the convex part of the cam, is in contact with one end of the push rod, which faces the cam, and the return spring is in a natural extension state; the driving part drives the cam to rotate, the protruding part of the cam strikes the push rod to drive the push rod to move along the axial direction of the push rod, and when the protruding part of the cam leaves the push rod, the push rod resets under the elastic force action of the reset spring.
More preferably, one end of the push rod facing the force application mechanism penetrates through a fixing frame, the fixing frame is fixedly arranged on a shell of the gas density relay body, and one end of the push rod far away from the force application mechanism extends out of an opening of the outer cover and then extends into the shell through an air hole in the shell of the gas density relay body; the end part of the push rod extending into the shell is opposite to the pressure detection element in the shell.
Further, the load cell is in contact with the pressure detection element through a contact member, or the load cell is in direct contact with the pressure detection element.
Furthermore, a return spring is sleeved on the push rod between the fixing frame and the air hole.
Furthermore, the force transmission piece is a cam, the end surface of the cam, which is opposite to the convex part of the cam, is in contact with one end of the push rod, which faces the cam, and the return spring is in a natural extension state; the driving part drives the cam to rotate, the protruding part of the cam strikes the push rod to drive the push rod to move along the axial direction of the push rod, and when the protruding part of the cam leaves the push rod, the push rod resets under the elastic force action of the reset spring.
More preferably, the movement comprises a sector gear and a central gear, a first end of the sector gear is meshed with the central gear, and a second end of the sector gear is connected with the other end of the temperature compensation element through a connecting rod or directly; the second end part of the sector gear is fixedly connected with one end of a sector gear contact piece, and the other end of the sector gear contact piece extends out of the shell from an air hole of the shell of the gas density relay body and is opposite to one end, far away from the force application mechanism, of a push rod of the driving contact action mechanism.
Furthermore, the force application mechanism applies acting force to the sector gear contact piece through the push rod, the second end portion of the sector gear generates displacement, the first end portion of the sector gear meshed with the central gear drives the central gear to rotate, the central gear and the pointer are both installed on the driving rod, the driving rod is driven by the rotation of the central gear to rotate, and the pointer is enabled to move and indicate on the dial.
Furthermore, a trigger is arranged on the pointer and used for enabling the contact of the signal generator to be connected or disconnected.
Further, the force measuring sensor is arranged on the force application mechanism of the driving contact actuating mechanism.
Preferably, the gas density relay body comprises a first corrugated pipe arranged in the housing and used as a pressure detection element, and further comprises a second corrugated pipe, a first opening end of the first corrugated pipe is fixed on the inner wall of the housing, a second opening end of the first corrugated pipe is connected with a first sealing element in a sealing manner, the inner wall of the first corrugated pipe, the first sealing element and the inner wall of the housing jointly enclose a 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, a second sealing air chamber is defined by 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 together, and standard compensation gas is filled in the second sealing air chamber to form a temperature compensation element; the inner wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly enclose a third air chamber, the signal generator and the signal action mechanism are arranged in the third air chamber, the signal action mechanism is connected with the first sealing element, and the signal generator is arranged corresponding to the signal action mechanism; the driving contact actuating mechanism is arranged in the shell of the gas density relay body, a fixing piece is arranged at one end, close to the force transmission piece, of the push rod, one end, far away from the force transmission piece, of the push rod penetrates through a fixing frame fixed on the inner wall of the shell, and extends to the position, below the fixing frame, opposite to the signal actuating mechanism.
More preferably, the outer diameter of the first bellows is larger than the outer diameter of the second bellows.
More preferably, the signal actuating 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 an adjusting fixing piece, the adjusting fixing piece 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.
More preferably, a return spring is sleeved on the push rod between the fixing member and the fixing frame.
More preferably, the load cell is connected to the push rod through a contact member, or the load cell is directly connected to the push rod.
Furthermore, the force measuring sensor is arranged at one end of the push rod, which faces the force transmission piece, or the force measuring sensor is arranged at one end of the push rod, which faces away from the force transmission piece.
Preferably, the intelligent control unit acquires gas density values acquired by the first pressure sensor and the temperature sensor; or, the intelligent control unit acquires the pressure value acquired by the first pressure sensor and the temperature value acquired by the temperature sensor, and is used for completing the online monitoring of the gas density of the electrical equipment by the gas density relay.
Preferably, 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 force F acquired by the load cell when the contact signal of the gas density relay body is actuated or switched, calculates or converts the pressure value P1 and the temperature value T into a corresponding pressure value P2 according to the force F, and calculates an equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; 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 the force F collected by the force sensor is combined with the temperature value T collected by the temperature sensor and is calculated or converted into a corresponding gas density value P220And according to the gas density value P120And a gas density value P220Calculating to obtain 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 pressure value P1 and the temperature value T that temperature sensor gathered of first pressure sensor, and the power F that load cell gathered to calculate according to pressure value P1, T and F and obtain corresponding gas density value P20And completing the online verification of the gas density relay.
More preferably, when the contact signal action or switching occurs in the gas density relay body, the equivalent gas pressure value P is P1-P2; 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 generates contact signal action or switching, the equivalent gas pressure value P is P1-P2K; wherein K is a preset coefficient; in accordance withConverting into pressure value of 20 deg.C according to the equivalent gas pressure value P, temperature value T and gas pressure-temperature characteristic, i.e. gas density value P20And completing the online verification of the gas density relay.
More preferably, the gas density value P of the gas density relay body is the value of the gas density when the contact signal is activated or switched20And a gas density value P120、P220The corresponding relation between the gas density values is designed into a data table in advance and is according to the gas density value P120And a gas density value P220Inquiring 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 generates contact signal action or switching, its gas density value P20The corresponding relations between the gas pressure values P1, P2 and the temperature value T are designed into a data table in advance, and the data table is inquired according to the gas pressure values P1, P2 and the temperature value T to obtain the corresponding gas density value P20Completing the online calibration of the gas density relay body; or,
when the gas density relay body generates contact signal action or switching, its gas density value P20The corresponding relation among the gas pressure value P1, the force F acquired by the force transducer and the temperature value T is designed into a data table in advance, and the data table is inquired according to the gas pressure value P1, the force F acquired by the force transducer and the temperature value T to obtain a corresponding gas density value P20And completing the online verification of the gas density relay body.
Preferably, the gas density relay or the gas density monitoring device further comprises an online check contact signal sampling unit, wherein the online check contact signal sampling unit is respectively connected with the signal generator and the intelligent control unit of the gas density relay body and is configured to sample the contact signal of the gas density relay body.
More 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, or an actuating contact actuating 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.
Furthermore, the online checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay body and the contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay body and the intelligent control unit; in a non-verification state, the second connection circuit is opened, and the first connection circuit is closed; under the check-up state, online check-up contact signal sampling unit cuts off first connecting circuit, intercommunication second connecting circuit will the contact of gas density relay body with the intelligence is controlled the unit and is connected.
More preferably, the gas density relay or gas density monitoring apparatus further comprises: the multi-way connector is characterized in that the multi-way connector is provided with one or more gas density relay bodies, the first pressure sensor, the driving contact action mechanism, the online checking contact signal sampling unit, the intelligent control unit and the temperature sensor.
Preferably, the control of the intelligent control unit is controlled through a field control and/or a background control.
Preferably, a display mechanism for displaying the density of the insulating gas is further arranged on the shell of the gas density relay body.
More preferably, the display mechanism comprises a connecting mechanism, a movement, a pointer and a dial, the movement is connected with the signal action mechanism through the connecting mechanism, the pointer is mounted on the movement and arranged in front of the dial, and the pointer is combined with the dial to display the gas density value; alternatively, the display mechanism comprises a liquid crystal or/and a digital tube.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
the application provides a gas density relay and monitoring devices with online self-checking function for high pressure, middling pressure electrical equipment, including gas density relay body, first pressure sensor, temperature sensor, force cell sensor, order about contact actuating mechanism and intelligence accuse unit. Order about contact actuating mechanism and be configured as directly, or indirectly order about the signal actuating mechanism of gas density relay body takes place the displacement, makes the gas density relay body takes place the contact signal action, and the density value when the unit is controlled according to the contact action to the intelligence detects out the warning of gas density relay body and/or shutting contact signal action value and/or return value, need not the maintainer to the on-the-spot check-up work that just can accomplish gas density relay, has improved the reliability of electric wire netting, has improved efficiency, and the cost is reduced can realize gas density relay's non-maintaining. Meanwhile, the whole checking process realizes zero emission of SF6 gas and meets the requirements of environmental protection regulations. Most importantly, because the utility model discloses the technique has carried out technological innovation: the driving contact actuating mechanism is not communicated with the gas density relay body or the main gas path of SF6 of the electrical equipment, so that the reliability of the power grid can be greatly improved, the sealing requirement of the power grid can be reduced, the manufacturing cost can be reduced, and the convenience and the flexibility of field installation can be improved. This application has realized online check-up to gas density relay, and then realizes the intelligent management of the full life cycle of gas density relay: the repair is carried out when the problem exists, and the operation and maintenance service is not needed when the problem does not exist.
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;
fig. 4 is a schematic structural diagram of a gas density relay with an online self-checking function according to a fourth 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:
fig. 1 is a schematic structural diagram of a gas density relay according to a first embodiment of the present application. As shown in fig. 1, a gas density relay includes: the gas density relay comprises a gas density relay body 1, a first pressure sensor 2, a temperature sensor 3, a force measuring sensor 16, an actuating contact actuating mechanism 15, an online checking contact signal sampling unit 6 and an intelligent control unit 7.
The gas density relay body 1 comprises a housing 101, and a base 102, an end seat 108, a pressure detection element 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, a connecting rod 112 and a dial 107 which are arranged in the housing 101. The movement 105 is fixed on the base 102; one end of the pressure detection element 103 (barton tube) is fixed on the base 102 and is communicated with the base, the pressure detection element 103 (barton tube) is filled with sealing gas, the other end of the pressure detection element 103 (barton tube) is connected with one end of the temperature compensation element 104 through the end seat 108, the temperature compensation element 104 adopts a temperature compensation sheet, and the other end of the temperature compensation element 104 is provided with a signal action mechanism 111; the signal operating mechanism 111 is provided with an adjusting member (for example, an adjusting screw) for pushing the signal generator 109 to make or break a contact of the signal generator 109, the signal generator 109 includes a micro switch or a magnetic auxiliary electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109. End block 108 has end block contact plate 108A. The other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod 112 or directly connected with the movement 105; the pointer 106 is mounted on the movement 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 gas density relay body 1 of the present embodiment may 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. First pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6 and intelligent control unit 7 set up on connecting 110. The load cell 16 and the actuating contact point mechanism 15 are disposed outside the housing 101. The first pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6, the force sensor 16 and the intelligent control unit 7 are connected; the online verification contact signal sampling unit 6 is connected to the signal generator 109.
The driving contact actuating mechanism 15 is arranged outside the housing 101 and is arranged corresponding to the end seat contact plate 108A on the end seat 108 of the gas density relay body 1; the contact actuating mechanism 15 is configured to indirectly displace the signal actuating mechanism 111 of the gas density relay body 1, and thereby the contact signal of the gas density relay body 1 is actuated. Specifically, the contact actuating mechanism 15 includes a housing 158 having an opening, and a driving member 151, a force transmitting member 152 and a push rod 153 disposed in the housing 158, wherein the push rod 153 is disposed corresponding to the end seat contact plate 108A, and the opening of the housing 158 faces the housing 101 of the gas density relay body 1. The force transmission member 152 is driven to rotate by the driving member 151; the end, close to the force transmission piece 152, of the push rod 153 is provided with a fixing piece 156, the fixing piece 156 is fixedly arranged on the inner wall of the outer cover 158, one end, far away from the force transmission piece 152, of the push rod 153 penetrates through a fixing frame 155 fixed at the opening of the outer cover 158, the fixing frame 155 is provided with a through guide hole for the push rod 153 to penetrate through, the inner diameter of the guide hole is larger than the outer diameter of the push rod 153, after one end, far away from the force transmission piece 152, of the push rod 153 penetrates through the guide hole in the fixing frame 155, the push rod 153 extends into the shell 101 through an air hole in the shell 101 of the gas density relay body 1, and the end part of the push rod.
In this embodiment, the driving member 151 is a motor, and the force-transmitting member 152 is a cam, and the cam is driven by the motor to rotate. The motor-driven cam rotating specific modes are numerous, for example, a rotating shaft is connected between two supporting plates through a bearing, the cam is arranged between the two supporting plates through the rotating shaft, the output shaft of the motor is fixedly connected with one end of the rotating shaft, and when the motor rotates, the rotating shaft is driven to rotate, so that the cam fixedly installed on the rotating shaft is driven to rotate. For example, a rotatable rotating shaft is arranged above the push rod, the cam and a gearwheel are coaxially and fixedly arranged on the rotating shaft, a pinion is fixedly arranged on an output shaft of the motor and meshed with the gearwheel, and when the motor rotates, the pinion is driven to rotate, and the gearwheel rotates along with the pinion to drive the rotating shaft for mounting the gearwheel to rotate, so that the cam fixedly arranged on the rotating shaft is driven to rotate.
A return spring 154 is sleeved on the push rod 153 between the fixing member 156 and the fixing frame 155, one end of the return spring 154 is fixedly connected with the fixing member 156, and the other end is fixedly connected with the fixing frame 155. When the push rod 153 is in an unstressed state, the end face of the cam opposite to the convex part of the cam is in contact with one end of the push rod 153 provided with the fixing part 156, the return spring 154 is in a natural extension state, and the part of the push rod 153 extending out of the fixing frame 155 is positioned on one side of the end seat contact plate 108A of the gas density relay body 1 and is not in contact with the end seat contact plate 108A. When the motor drives the cam to rotate, the convex part of the cam strikes the push rod 153, the push rod 153 is driven to move along the axial direction of the cam, and when the convex part of the cam leaves the end, provided with the fixing piece 156, of the push rod 153, the push rod 153 is reset under the elastic force of the reset spring 154.
The contact actuating mechanism 15 further includes a load cell 16, and the load cell 16 is connected to the push rod 153 through a contact member 1501. In this embodiment, the load cell 16 is a displacement sensor or a deformation sensor, and is disposed at one end of the push rod 153 where the fixing member 156 is disposed. The load cell 16 is connected to the intelligent control unit 7, and is configured to detect a force F applied by the actuating mechanism 15 to the end seat 108.
When the driving member 151 is not energized, the push rod 153 is away from the head base contact plate 108A by the spring 154, and the push rod 153 does not apply an energizing force to the head base contact plate 108A. The load cell 16 is connected to the push rod 153 through the contact member 1501, the push rod 153 is acted by the force application member 151 and the force transmission member 152, and the acting force F on the spring 154 can be obtained by detecting the deformation amount of the spring 154 through the load cell 16 (F ═ L × N, where L is the deformation amount, mm, and N is the elastic coefficient, kg/mm). During the verification, the force applying member 151 rotates the force transmitting member 152, and then the push rod 153 is pushed to move rightward, so as to apply an acting force F to the spring 154 and the end seat contact plate 108A (i.e., the end seat 108), that is, the force applying member 151 applies an acting force to the end seat 108 through the force transmitting member 152, so that the gas density relay body 1 generates a contact signal action.
The driving part 151 includes, but is not limited to, one of a magnetic force, a gravity, a motor, a reciprocating mechanism, a carnot cycle mechanism, an air compressor, a purge valve, a pressurizing pump, a pressurizing valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust mechanism, an electric heating thrust mechanism, and a chemical reaction thrust mechanism; the force-transmitting member 152 includes, but is not limited to, one of a cam, a connecting rod, a spring, a metal member, a non-metal member, a telescoping member, and a non-telescoping member; the load cell 16 includes, but is not limited to, one of a gravity sensor, a pressure sensor, a magnetic sensor, a displacement sensor, a deformation sensor, a photoelectric sensor, an angle sensor, a deformation sensor, a force sensor, and a camera, and the displacement sensor includes, but is not limited to, one of a laser displacement sensor, an infrared displacement sensor, a contact displacement sensor, and a non-contact displacement sensor.
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 P20(i.e., gas density value). When the gas 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 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 or a locking control loop cannot be sent by mistake during checking. 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.
The intelligent control unit 7 drives the contact actuating mechanism 15 to displace the end seat 108 of the gas density relay body 1, the temperature compensation element 104 displaces the signal actuating mechanism 111, and an adjusting piece (e.g., an adjusting screw) on the signal actuating mechanism 111 pushes the signal generator 109 (e.g., a microswitch), so that the contact of the signal generator 109 is switched on and a corresponding contact signal (alarm or lock) is sent out.
Then, the push rod 153 is reset by the elastic force of the return spring 154, no force is applied to the end seat contact plate 108A, the temperature compensation element 104 is reset, the adjusting member is away from the signal generator 109, the contact of the signal generator 109 is opened, and the contact signal (alarm or latch) is released.
Unit 7 is controlled to intelligence acquires when gas density relay body 1 takes place contact signal action or switches pressure value P1 and the temperature value T that temperature sensor 3 gathered that first pressure sensor 2 gathered, and force F that force sensor 16 gathered calculates or converts into corresponding pressure according to force FA force value P2, and calculating an equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; 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 unit 7 obtains the gas density value P1 collected by the first pressure sensor 2 and the temperature sensor 3 when the gas density relay body 1 generates contact signal action or switching20And the force F collected by the load cell 16, combined with the temperature value T collected by the temperature sensor 3, is calculated or converted into a corresponding gas density value P220And according to the gas density value P120And a gas density value P220Calculating 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-P2; 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-P2K; k is a preset coefficient and is obtained according to the characteristics of the gas 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、P220The 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 P220Inquiring 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 P20And gas pressure values P1,The corresponding relation between P2 and temperature value T is designed into a data table, and the data table is inquired according to the gas pressure values P1, P2 and temperature value T to obtain the corresponding gas density value P20And completing the online verification of the gas density relay. 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 intelligent control unit 7 is restored to drive the contact actuating mechanism 15. 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) in-place annunciations, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or uploading is implemented through an online remote transmission communication mode, for example, the information 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 online verification work of the gas density relay is completed, 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 calibration of the gas density relay is completed, if there is an abnormality, the intelligent control unit 7 may 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 may display a notification 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 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.
The 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.
The type of the first pressure sensor 2 described above: 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 described above 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 online check contact signal sampling unit 6 is used for completing 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 above-mentioned intelligent control unit 7 are: 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. At the same time can pass through the gasAnd the test of the rated pressure value of the body density relay body 1 is completed, the self-checking work among the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 is completed, and the maintenance-free operation is realized.
The electrical equipment includes SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environment-friendly gas electrical equipment, or other insulating 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, drive and order about contact actuating mechanism 15, online check-up contact signal sampling unit 6 and intelligent control unit 7 and can carry out nimble setting 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.
The force application mechanism and the movement mechanism can also be designed integrally; alternatively, the drive part of the force application mechanism and the force transmission piece driven by the drive part can also be designed integrally; the push rod of the movement mechanism is generally referred to as a pushing piece, and the push rod (pushing piece) moves under the driving of the force application mechanism to directly or indirectly displace the signal action mechanism. The force transfer member broadly refers to a force transfer component including, but not limited to, one of a cam, a connecting rod, a spring, a metallic member, a non-metallic member, a telescoping member, and a non-telescoping member. The actuating contact actuating mechanism may be disposed in a housing of the gas density relay body. The end part of the push rod penetrating out of the fixing frame extends into the shell from an air hole in the shell of the gas density relay body, and the push rod can be in sealing contact with the inner wall of the shell or can not be in contact with the inner wall of the shell; the push rod is arranged opposite to the pressure detection element, the temperature compensation element, the signal generator or the signal action mechanism, or the push rod is directly or indirectly connected with or contacted with the pressure detection element, the temperature compensation element, the signal generator or the signal action mechanism. The load cell can also be connected to the pressure detection element, or the temperature compensation element, or the signal generator, or the signal actuator via a contact or directly. The gas density relay comprises a signal generator (specifically, a magnetic-assisted electric contact), a gas density relay body and a signal action mechanism, wherein the signal action mechanism is provided with a trigger piece for pushing the signal generator and enabling a contact of the signal generator to be connected or disconnected, specifically, the trigger piece completes the connection or disconnection of the contact of the signal generator (specifically, the magnetic-assisted electric contact) according to a gas density value, and the gas density relay body outputs a contact signal through the signal generator (specifically, the magnetic-assisted electric contact).
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.
The difference from the first embodiment is that:
1) the actuating contact actuating mechanism 15 is arranged outside the shell 101 and corresponds to the pressure detection element 103 (bourdon tube) of the gas density relay body 1; the contact actuating mechanism 15 is configured to indirectly displace the signal actuating mechanism 111 of the gas density relay body 1, so as to generate a contact signal action for the gas density relay body 1.
The actuating contact actuating mechanism 15 includes a housing 158 with an opening at one end, and a driving member 151, a force-transmitting member 152 (cam), a push rod 153, a spring 154, and a fixing frame 155 disposed in the housing 158; wherein the opening of the outer cover 158 faces the housing 101 of the gas density relay body 1, and the push rod 153 is disposed opposite to the pressure detection element 103 (bourdon tube) inside the housing 101. The load cell 16 (in this case, a pressure sensor, or a displacement sensor, or a deformation amount sensor, or a photoelectric sensor, or a strain gauge sensor) is disposed opposite to the pressure detecting element 103 (the bourdon tube), wherein the force contact member 16A of the load cell 16 is in contact with the pressure detecting element 103 (the bourdon tube), and the force F applied to the pressure detecting element 103 (the bourdon tube) by the push rod 153 can be detected by the load cell 16.
The force transmission member 152 is driven to rotate by the driving member 151; the fixing bracket 155 is fixedly arranged on the shell 101 of the gas density relay body 1; one end of the push rod 153 close to the force transmission piece 152 penetrates through the fixing frame 155, one end of the push rod 153 far away from the force transmission piece 152 extends out of the opening of the outer cover 158, then extends into the shell 101 through an air hole in the shell 101 of the gas density relay body 1 and is in sealing contact with the inner wall of the shell 101, and the end part of the push rod 153 extending into the shell 101 is opposite to the pressure detection element 103 (Barton pipe) in the shell 101. A return spring 154 is sleeved on the push rod 153 between the fixing frame 155 and the air hole of the casing 101, one end of the return spring 154 is fixedly connected with the fixing frame 155, and the other end is fixedly connected with the casing 101. When the push rod 153 is in an unstressed state, the end face of the force transmission member 152 (cam) opposite to the convex part of the force transmission member 152 (cam) is in contact with one end of the push rod 153 penetrating through the fixing frame 155, the return spring 154 is in a natural extension state, and the part of the push rod 153 extending into the housing 101 is positioned on one side of the pressure detection element 103 (barton tube) of the gas density relay body 1 and is not in contact with the pressure detection element 103 (barton tube), namely, the push rod 153 does not apply force to the pressure detection element 103 (barton tube).
During verification, the driving part 151 (motor) drives the force transmission piece 152 (cam) to rotate, the convex part of the force transmission piece 152 (cam) strikes the push rod 153, the push rod 153 is driven to move along the axial direction of the push rod 153, the push rod 153 applies force F to the pressure detection element 103 (Barton pipe), the end seat 108 at the tail end of the pressure detection element 103 (Barton pipe) is forced to displace, the signal action mechanism 111 is displaced by means of the temperature compensation element 104, the adjusting piece (for example, an adjusting screw) on the signal action mechanism 111 pushes the signal generator 109 (for example, a microswitch), the contact of the signal generator 109 is connected, and a corresponding contact signal (alarm or lock) is sent out. Then, when the convex portion of the force-transmitting member 152 (cam) is separated from the end of the push rod 153 penetrating the fixing frame 155, the push rod 153 is reset by the elastic force of the reset spring 154, no force is applied to the pressure detecting element 103 (bourdon tube), the temperature compensating element 104 is reset, the adjusting member is far away from the signal generator 109, the contact of the signal generator 109 is opened, and the contact signal (alarm or lock) is released.
Intelligent control unit 7 acquires when contact signal action or switching occurs in gas density relay body 1, pressure value P1 and temperature that first pressure sensor 2 gathered are passedCalculating or converting the temperature value T acquired by the sensor 3 and the force F acquired by the force sensor 16 into a corresponding pressure value P2 according to the force F, and calculating an equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; 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.
2) In this embodiment, the first pressure sensor 2, the online calibration contact signal sampling unit 6, and the intelligent control unit 7 are disposed on the connector 110. The temperature sensor 3 is disposed within the housing 101 and adjacent to the temperature compensation element 104, or the temperature sensor 3 is disposed directly on the temperature compensation element 104. The first pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the force sensor 16 are respectively connected with the intelligent control unit 7; the online verification contact signal sampling unit 6 is also connected to the signal generator 109.
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.
The difference from the first embodiment is that:
1) the actuating contact actuating mechanism 15 is arranged outside the housing 101, and includes a housing 158 with an opening at one end, and a driving member 151, a force-transmitting member 152 (cam) and a push rod 153 arranged in the housing 158; the cover 158 is sealingly (mainly against water ingress) connected to the housing 101 of the gas density relay body 1, and the opening of the cover 158 faces said housing 101. The contact actuating mechanism 15 is configured to indirectly displace the signal actuating mechanism 111 of the gas density relay body 1, and thereby the contact signal of the gas density relay body 1 is actuated.
The movement 105 of the gas density relay body 1 comprises a sector gear 1051 and a central gear, wherein a first end part of the sector gear 1051 is meshed with the central gear, and a second end part of the sector gear 1051 is connected with the other end of the temperature compensation element 104 through a connecting rod 112 or directly; the second end of the sector gear 1051 is fixedly connected to one end of a sector gear contact 1051A, and the other end of the sector gear contact 1051A extends out of the housing 101 of the gas density relay body 1 through an air hole of the housing 101 and is opposite to one end of the push rod 153 of the actuating contact actuating mechanism 15 away from the force application mechanism. The driving part 151 and the force transmission part 152 apply acting force to the sector gear contact piece 1051A through the push rod 153, the second end part of the sector gear 1051 generates displacement, the first end part of the sector gear 1051 meshed with the central gear drives the central gear to rotate, the central gear and the pointer 106 are both installed on the driving rod, and the driving rod is driven to rotate by the rotation of the central gear, so that the pointer 106 moves and indicates on a certain scale of the dial 107.
The load cell 16 (in this case, a pressure sensor, a displacement sensor, a deformation sensor, a photoelectric sensor, or a strain gauge sensor) is provided in the actuating contact actuating mechanism 15, and is capable of detecting the force F applied by the push rod 153 to the sector gear contact 1051A.
The working principle is as follows: when the driving member 151 is not biased, the push rod 153 is away from the sector gear contact 1051A, and the push rod 153 does not bias the sector gear contact 1051A. During verification, the driving part 151 applies a force F to the sector gear contact 1051A through the push rod 153, so that the sector gear 1051 is displaced correspondingly, the signal actuating mechanism 111 is driven to displace by means of the connecting rod 112 and the temperature compensation element 104, and an adjusting part (for example, an adjusting screw) on the signal actuating mechanism 111 pushes the signal generator 109, so that a contact of the signal generator 109 is switched on or off, and the gas density relay body 1 is driven to generate a contact signal action. Meanwhile, the intelligent control unit 7 obtains a pressure value P1 acquired by the first pressure sensor 2, a temperature value T acquired by the temperature sensor 3, and a force F acquired by the force sensor 16 when the contact signal action or switching occurs in the gas density relay body 1, calculates or converts the force F into a corresponding pressure value P2, and calculates an equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; the pressure value P corresponding to the equivalent gas and the pressure-temperature characteristic of the equivalent gas are converted into a pressure corresponding to 20 DEG CForce value, i.e. gas density value P20And completing the online verification of the gas density relay.
2) In this embodiment, the online verification contact signal sampling unit 6 and the intelligent control unit 7 are disposed on the connector 110. The first pressure sensor 2 is disposed on the base 102, and the temperature sensor 3 is disposed inside the housing 101. The first pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the force measuring sensor 16 are respectively connected with the intelligent control unit 7.
Example four:
as shown in fig. 4, a fourth embodiment of the present invention provides a gas density relay or a gas density monitoring device with an online self-calibration function. As shown in fig. 4, a gas density relay includes: the gas density relay comprises a gas density relay body 1, a first pressure sensor 2, a temperature sensor 3, a force measuring sensor 16, an actuating contact actuating mechanism 15, an online checking contact signal sampling unit 6 and an intelligent control unit 7.
The difference from the first embodiment is that:
1) the gas density relay body 1 of the present embodiment employs a bellows type gas density relay. Specifically, the device includes a housing 101, a first bellows 103 (i.e., a pressure detection element), a second bellows 113, a signal generator 109 (a microswitch in this embodiment), and a signal actuation mechanism 111. The first open end of the first bellows 103 is fixed on the inner wall of the housing 101, the second open end of the first bellows 103 is connected with the first sealing member 118 in a sealing manner, the inner wall of the first bellows 103, the first sealing member 118 and the inner wall of the housing 101 together enclose a first sealed air chamber G1, and the first pressure sensor 2 is communicated with the first sealed air chamber G1. The first sealed air chamber G1 is communicated with the insulating gas of the electrical equipment 8 through the multi-way connector 9 and the electrical equipment connector 13. A first opening end of the second bellows 113 is sealingly connected to the first sealing member 118, a second opening port of the second bellows 113 is connected to an inner wall of the housing 101 through a second sealing member 119, and an outer wall of the first bellows 103, the first sealing member 118, an outer wall of the second bellows 113, the second sealing members 119, andthe inner walls of the shells 101 jointly enclose a second sealed air chamber G2, and a density value P is filled in the second sealed air chamber G220BCThe second sealed gas cell G2 is a temperature compensation standard gas cell, and constitutes a temperature compensation element. The inner wall of the second bellows 113, the second sealing element 119 and the inner wall of the housing 101 together define a third air chamber G3, and the third air chamber G3 may be relatively sealed or semi-open. The signal actuator 111 and the signal generator 109 are disposed in the third air cell G3. The signal operating mechanism 111 is connected to the first seal 118, the signal generator 109 is provided corresponding to the signal operating mechanism 111, and the gas density relay body 1 outputs a contact signal through the signal generator 109. In this embodiment, the signal actuating mechanism 111 includes a moving rod, one end of the moving rod extends into the second bellows 113, is fixedly connected to the first sealing member 118, and is displaced along with the deformation of the first bellows 103; the other end of the movable rod extends out of the second corrugated pipe 113 and is fixedly connected with an adjusting fixing piece, a plurality of adjusting screws 10101 are arranged on the outer side of the adjusting fixing piece, and the adjusting screws 10101 are arranged corresponding to the corresponding signal generator 109. The gas density is monitored by the first sealed gas chamber G1 and the second sealed gas chamber G2, and the monitoring of the gas density is realized by combining the signal generator 109, and when the gas density is lower than or/and higher than the set gas density, an alarm or/and a locking joint signal is output by the signal generator 109.
The contact actuating mechanism 15 is disposed in the housing 101 of the gas density relay body 1 above the signal actuating mechanism 111, and is configured to directly apply an acting force to the signal actuating mechanism 111 to push the moving rod to move, so that the balance of forces acting on the upper end surface of the first bellows 103 by the first sealed gas chamber G1 and the third gas chamber G3 is broken, and the first bellows 103 is deformed with the movement of the moving rod to generate a certain displacement. The moving rod drives the adjusting screw 10101 to touch a button of the signal generator 109, and the signal generator 109 sends out an alarm and locking signal.
When the force transmitting member 152 (cam) is not biased, the push rod 153 is moved away from the moving rod of the signal operating mechanism 111 by the return spring 154, and the push rod 153 does not bias the moving rod of the signal operating mechanism 111. When the force-transmitting member 152 (cam) is applied, the push rod 153 is acted by the driving member 151 and the force-transmitting member 152, and the acting force F on the return spring 154 can be obtained by detecting the deformation amount of the return spring 154 by the load cell 16 (where F is L × N, where L is the deformation amount, mm, and N is the elastic coefficient, kg/mm). During verification, the force transmission piece 152 is driven by the driving piece 151 to rotate, the push rod 153 is pushed to move downwards, and then acting force F is applied to the spring 154 and the signal action mechanism 111, namely the driving piece 151 applies acting force to the signal action mechanism 111 through the force transmission piece 152, the adjusting screw 10101 on the signal action mechanism 111 pushes the signal generator 109, the contact of the signal generator 109 is connected, and a corresponding contact signal (alarm or lock) is sent out, namely the contact action mechanism 15 is driven to enable the gas density relay body 1 to generate contact signal action. The load cell 16 is disposed at one end of the push rod 153 facing the force transmission member, or above or below the adjustment fixing member, and is disposed opposite to the adjustment fixing member.
The working principle is as follows:
in a non-checking state, the intelligent control unit 7 monitors the gas pressure and the temperature of the electrical equipment 8 according to the first pressure sensor 2 and the temperature sensor 3 to obtain a corresponding pressure value P at 20 DEG C20The 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 that first pressure sensor 2 gathered and the temperature value that temperature sensor 3 gathered accomplish the on-line monitoring of gas density relay to the gas density of the electrical equipment who monitors. At this time, the gas density value of the first sealed gas chamber G1 is greater than the gas density value of the third gas chamber G3, i.e. the difference between the gas density value of the first sealed gas chamber G1 and the gas density value of the third gas chamber G3 is greater than a certain set value, as can be seen from fig. 3, there is a corresponding distance between the adjusting screw 10101 of the signal actuating mechanism 111 and the signal generator 109, and at this time, the adjusting screw 10101 does not contact the signal generator 109, i.e. there is no trigger signal generator109, the signal generator 109 is not operated, and the contact signal is not outputted.
When the density relay body 1 needs to be checked, the intelligent control unit 7 controls the driving part 151 of the driving contact actuating mechanism 15 to drive the force transmission part 152 to rotate, so that the force transmission part 152 rotates to push the push rod 153 to move downwards, and further exerts an acting force F on the spring 154 and the signal actuating mechanism 111, namely, the driving part 151 exerts the acting force F on the moving rod of the signal actuating mechanism 111 through the force transmission part 152, the pressure acting on the upper end surface of the first corrugated pipe 103 is increased, and the first corrugated pipe 103 is driven to move downwards to generate deformation. The moving rod is displaced downwards, so that the distance between the adjusting screw 10101 and the signal generator 109 is reduced, when the distance is smaller than a corresponding value, the adjusting screw 10101 of the signal action mechanism 111 contacts the signal generator 109, namely the signal generator 109 is triggered, the contact of the signal generator 109 is acted (switched on), and a corresponding contact signal (alarm or lock) is sent. 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, a temperature value T acquired by a temperature sensor 3 and a force F acquired by a force sensor 16 when the contact signal action or switching occurs on the gas density relay body 1, calculates or converts the pressure value into a corresponding pressure value P2 according to the force F, and calculates an equivalent gas pressure value P according to the pressure value P1 and the pressure value P2; 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 unit 7 obtains the gas density value P1 collected by the first pressure sensor 2 and the temperature sensor 3 when the gas density relay body 1 generates contact signal action or switching20And the force F collected by the load cell 16, combined with the temperature value T collected by the temperature sensor 3, is calculated or converted into a corresponding gas density value P220And according to the gas density value P120And a gas density value P220Calculating 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-P2; 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-P2M, wherein M is a preset coefficient and is obtained according to the characteristics of the gas density relay; 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、P220The corresponding relation between the gas density values is designed into a data table in advance and is according to the gas density value P120And a gas density value P220Inquiring 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, P2 and the temperature value T are designed into a data table, and the data table is inquired according to the gas pressure values P1, P2 and the temperature value T to obtain the corresponding gas density value P20And completing the online verification of the gas density relay. The verification is repeated for multiple times (for example, 2 to 3 times), and then the average value of the verification is calculated, so that the verification work of the gas density relay is completed.
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. 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 is conveniently finished, and the safe operation of the electrical equipment cannot be influenced when the gas density relay is checked online.
To sum up, the application provides a gas density relay with online self-checking function for high pressure, middling pressure electrical equipment includes gas density relay body, first pressure sensor, temperature sensor, force cell sensor, orders about contact actuating mechanism and intelligence accuse unit. The driving contact actuating mechanism is configured to apply an acting force to at least one main element of the gas density relay body, for example, an end seat, a pressure detection element, a cassette mechanism or the like of the gas density relay body is driven to displace, and then the signal actuating mechanism is displaced, so that the gas density relay body generates a contact signal action; or the contact actuating mechanism is directly actuated to displace the signal actuating mechanism of the gas density relay body, so that the gas density relay body generates contact signal action. The load cell is connected or associated with at least one of the main elements of the actuating contact actuating mechanism or the gas density relay body for detecting the force exerted by the force exerting mechanism on the main element of the body density relay body, where the main elements may include: pressure detection component, end seat, temperature compensation component, signal generator, signal action mechanism, core, pointer. Alternatively, at least one diagnostic sensor can also be provided on the gas density relay body for detecting a corresponding position, and/or a corresponding displacement, and/or a corresponding deformation of at least one of the main elements of the gas density relay body. And judging whether the data monitored by the diagnosis sensor meets the preset requirement according to the gas pressure during monitoring and the force applied by the driving contact action mechanism, so as to diagnose whether the current working state of the gas density relay body is a normal working state. When the contact action takes place, the intelligence accuse unit detects out the warning of gas density relay body and/or shutting contact signal action value and/or return value according to the density value when the contact action, need not have the maintainer to the on-the-spot check-up work that just can accomplish gas density relay, has improved the reliability of electric wire netting, has improved work efficiency, has reduced the operation maintenance cost, can realize gas density relay's non-maintenance. Meanwhile, the whole checking process realizes zero emission of SF6 gas and meets the requirements of environmental protection regulations. Most importantly, because the utility model discloses the technique has carried out technological innovation: the driving contact actuating mechanism is not communicated with the main gas circuit of the SF6 of the gas density relay body or the electrical equipment, so that the reliability of a power grid can be greatly improved, the sealing requirement of the power grid can be reduced, the manufacturing cost can be reduced, and the convenience and the flexibility of field installation can be improved. This application has realized online check-up to gas density relay, and then realizes the intelligent management of the full life cycle of gas density relay: the repair is carried out when the problem exists, and the operation and maintenance service is not needed when the problem does not exist.
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 (25)
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 first pressure sensor, a temperature sensor, a force measuring sensor, a driving contact action mechanism and an intelligent control unit;
the gas density relay body includes: the temperature compensation device comprises a shell, a pressure detection element, a temperature compensation element, a signal generator and a signal action mechanism, wherein the pressure detection element, the temperature compensation element, the signal generator and the signal action mechanism are arranged in the shell;
the first pressure sensor is communicated with the pressure detection element of the gas density relay body;
the driving contact actuating mechanism is arranged in the shell or outside the shell and comprises a force application mechanism and a movement mechanism, the force application mechanism comprises a driving part and a force transmission part driven by the driving part, the movement mechanism comprises a push rod, the push rod moves under the driving of the force application mechanism, and the signal actuating mechanism is directly or indirectly displaced to trigger the signal generator to generate a contact signal to act;
the force measuring sensor is arranged on the actuating contact actuating mechanism or in the shell and is configured to detect the force applied by the actuating contact actuating mechanism to the gas density relay body;
the intelligent control unit is respectively connected with the driving contact action mechanism, the first pressure sensor, the temperature sensor and the force measuring sensor and is configured to complete control of the driving contact action mechanism, pressure value collection, temperature value collection and/or gas density value collection, or/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 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; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell; the pressure detecting element includes a bourdon tube or a bellows tube.
3. The gas density relay with the online self-checking function according to claim 1, characterized in that: the force measuring sensor comprises one of a gravity sensor, a pressure sensor, a magnetic sensor, a displacement sensor, a deformation sensor, a photoelectric sensor, an angle sensor and a camera.
4. The gas density relay with the online self-checking function according to claim 1, characterized in that: the driving part comprises one of a magnetic force mechanism, a gravity mechanism, a motor, a reciprocating mechanism, a Carnot cycle mechanism, an air compressor, a compressor, an air release valve, a pressure generating pump, a booster valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust generating mechanism, an electric heating thrust generating mechanism and a chemical reaction thrust generating mechanism.
5. The gas density relay with the online self-checking function according to claim 1, characterized in that: the power transmission piece comprises one of a cam, a connecting rod, a spring, a metal piece, a non-metal piece, a telescopic piece and a non-telescopic piece.
6. The gas density relay with the online self-checking function according to claim 1, characterized in that: the force measuring sensor is arranged on a push rod driving the contact actuating mechanism; or,
the force sensor is arranged on the pressure detection element; or,
the force sensor is arranged on the temperature compensation element; or,
the force sensor is arranged on the signal action mechanism.
7. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body also comprises a base, an end seat and a machine core which are arranged in the shell; the movement is fixed on the base; the pressure detection element is a bourdon tube filled with sealed gas, one end of the pressure detection element is fixed on the base and communicated with the base, the other end of the pressure detection element is connected with one end of the temperature compensation element through the end seat, and the other end of the temperature compensation element is provided with a signal action mechanism; the signal action mechanism is provided with an adjusting screw or a trigger piece which pushes the signal generator and enables the contact of the signal generator to be connected or disconnected, and the gas density relay body outputs a contact signal through the signal generator; the driving contact actuating mechanism is arranged outside the shell of the gas density relay body and also comprises an outer cover provided with an opening, the outer cover is fixedly connected to the shell, the opening faces the shell, and the driving part, the force transmission part and the push rod are arranged in the outer cover; or the driving contact actuating mechanism is arranged in the shell of the gas density relay body.
8. The gas density relay with the online self-checking function according to claim 7, wherein: a fixing piece is arranged at one end of the push rod facing the force application mechanism, the fixing piece is fixed in the outer cover, the other end of the push rod penetrates through a fixing frame fixed at an opening of the outer cover, and the end part of the push rod penetrating out of the fixing frame extends into the shell from an air hole in the shell of the gas density relay body; the end seat in the shell is provided with an end seat contact plate, and the end part of the push rod extending into the shell is opposite to the end seat contact plate.
9. The gas density relay with the online self-checking function according to claim 8, wherein: the force measuring sensor is connected with the push rod through a contact element, or the force measuring sensor is directly connected with the push rod.
10. The gas density relay with the online self-checking function according to claim 8, wherein: and a return spring is sleeved on the push rod between the fixing piece and the fixing frame.
11. A gas density relay with an on-line self-checking function according to claim 10, wherein: the force transmission piece is a cam, the end face of the cam, opposite to the convex part of the cam, is in contact with one end, facing the cam, of the push rod, and the return spring is in a natural extension state; the driving part drives the cam to rotate, the protruding part of the cam strikes the push rod to drive the push rod to move along the axial direction of the push rod, and when the protruding part of the cam leaves the push rod, the push rod resets under the elastic force action of the reset spring.
12. The gas density relay with the online self-checking function according to claim 7, wherein: one end of the push rod, facing the force application mechanism, penetrates through a fixing frame, the fixing frame is fixedly arranged on a shell of the gas density relay body, and one end of the push rod, far away from the force application mechanism, extends out of an opening of the outer cover and then extends into the shell through an air hole in the shell of the gas density relay body; the end part of the push rod extending into the shell is opposite to the pressure detection element in the shell.
13. A gas density relay with an on-line self-checking function according to claim 12, wherein: the load cell is in contact with the pressure detection element through a contact member, or the load cell is in direct contact with the pressure detection element.
14. A gas density relay with an on-line self-checking function according to claim 12, wherein: and a return spring is sleeved on the push rod between the fixed frame and the air hole.
15. The gas density relay with the online self-checking function according to claim 7, wherein: the machine core comprises a sector gear and a central gear, wherein the first end of the sector gear is meshed with the central gear, and the second end of the sector gear is connected with the other end of the temperature compensation element through a connecting rod or directly; the second end part of the sector gear is fixedly connected with one end of a sector gear contact piece, and the other end of the sector gear contact piece extends out of the shell from an air hole of the shell of the gas density relay body and is opposite to one end, far away from the force application mechanism, of a push rod of the driving contact action mechanism.
16. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body comprises a first corrugated pipe and a second corrugated pipe, the first corrugated pipe is arranged in the shell and serves as a pressure detection element, the first corrugated pipe is fixed to the inner wall of the shell, the second corrugated pipe is connected with a 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 a 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, a second sealing air chamber is defined by 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 together, and standard compensation gas is filled in the second sealing air chamber to form a temperature compensation element; the inner wall of the second corrugated pipe, the second sealing element and the inner wall of the shell jointly enclose a third air chamber, the signal generator and the signal action mechanism are arranged in the third air chamber, the signal action mechanism is connected with the first sealing element, and the signal generator is arranged corresponding to the signal action mechanism; the driving contact actuating mechanism is arranged in the shell of the gas density relay body, a fixing piece is arranged at one end, close to the force transmission piece, of the push rod, one end, far away from the force transmission piece, of the push rod penetrates through a fixing frame fixed on the inner wall of the shell, and extends to the position, below the fixing frame, opposite to the signal actuating mechanism.
17. A gas density relay with an on-line self-checking function according to claim 16, wherein: the outer diameter of the first bellows is larger than the outer diameter of the second bellows.
18. A gas density relay with an on-line self-checking function according to claim 16, wherein: the signal action 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 an adjusting fixing piece, the adjusting fixing piece 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.
19. A gas density relay with an on-line self-checking function according to claim 16, wherein: and a return spring is sleeved on the push rod between the fixing piece and the fixing frame.
20. A gas density relay with an on-line self-checking function according to claim 16, wherein: the force measuring sensor is arranged at one end of the push rod, which faces to the force transmission piece, or at one end of the push rod, which is back to the force transmission piece.
21. The gas density relay with the online self-checking function according to claim 1, characterized in that: still include online check-up contact signal sampling unit, online check-up contact signal sampling unit respectively with the signal generator and the intelligent control unit of gas density relay body are connected, are configured as the sampling the contact signal of gas density relay body.
22. A gas density relay with on-line self-checking function according to claim 21, 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, or an actuating contact actuating 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.
23. A gas density relay with on-line self-checking function according to claim 21, characterized in that: still include many logical joints, the gas density relay body first pressure sensor order about contact actuating mechanism on the online check-up contact signal sampling unit intelligence accuse unit one or more among the temperature sensor set up on the many logical joint.
24. The gas density relay with the online self-checking function according to claim 1, characterized in that: and a display mechanism for displaying the density of the insulating gas is also arranged on the shell of the gas density relay body.
25. 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 1-24; or, the gas density monitoring device comprises a gas density relay with an online self-checking function as claimed in any one of claims 1-24.
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