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CN-114974998-B - Double-pressure-measurement gas density relay

CN114974998BCN 114974998 BCN114974998 BCN 114974998BCN-114974998-B

Abstract

The embodiment of the invention relates to a double-pressure-measurement gas density relay which comprises a first sensing module, a second sensing module, a temperature compensation module, an indication module, an action module and a signal generator. According to the technical scheme provided by the invention, the two sensing modules respectively connected to the indication module and the action module are arranged, so that the display and action double-way pressure measurement is realized, the accuracy of gas density monitoring of gas-insulated or arc-extinguishing electrical equipment is improved through the adjustable action module, the improvement of the electrical performance of the gas density relay and the accuracy of contact points is ensured, meanwhile, stable long-distance signal transmission can be realized, the reliable operation of a system is more comprehensively ensured, and the gas density relay can be well applied to various SF 6 electrical equipment.

Inventors

  • BAI ZHILU
  • WU HAIBIAO
  • GENG LEI
  • AI CHENGUANG
  • LI BOTAO
  • LU JIE
  • CAO ZILONG
  • WANG SHUWEI
  • CHENG ZHANFENG
  • XIA BO
  • REN DAJIANG
  • ZHANG GUANGHUI
  • ZHU GUANGYU
  • LU HAIHUI
  • XIA QIUPING
  • WANG HAIDONG
  • HUANG XIAOBENG
  • JIN HAIYONG
  • TIAN WENCHAO
  • WEI YABIN
  • PANG LELE
  • ZHAO YAJIE
  • LI PENGFEI
  • GAO ZHAO
  • LI HUAILI

Assignees

  • 国网冀北电力有限公司张家口供电公司
  • 国家电网有限公司
  • 上海乐研电气有限公司

Dates

Publication Date
20260505
Application Date
20220407

Claims (8)

  1. 1. A double-pressure-measurement gas density relay is characterized by comprising a first sensing module, a second sensing module, a temperature compensation module, an indication module, an action module and a signal generator (126), wherein, The first sensing module and the second sensing module are respectively arranged in the shell of the gas density relay, and output a first elastic deformation value and a second elastic deformation value which are related to the detected gas density change value when the gas pressure changes; The temperature compensation module is respectively connected with the first sensing module and the second sensing module, and converts the first elastic deformation value and the second elastic deformation value into a first displacement value and a second displacement value respectively and outputs the first displacement value and the second displacement value; The indication module is connected with the temperature compensation module, receives a first displacement value output by the temperature compensation module, and indicates a gas density change value corresponding to the first displacement value; The action module is connected with the temperature compensation module, receives a second displacement value output by the temperature compensation module, and outputs a switch action signal to the signal generator (126) according to the second displacement value; The action module comprises an output action adjusting unit (125), wherein the output action adjusting unit (125) receives the second displacement value and adjusts the magnitude of an output switch action signal according to the magnitude of the second displacement value, and the action module further comprises a control movement unit (124), wherein the control movement unit (124) comprises a movement main body (1241), a movement shaft (1242) and a crank surface (1243); the movement shaft (1242) is fixedly connected with the movement main body (1241) and vertically protrudes to one side far away from the temperature compensation module; one or more crankshaft surfaces (1243) are arranged on the shaft of the protruding part of the mandrel (1242) in parallel, and each crankshaft surface (1243) is perpendicular to the shaft and moves along with the mandrel (1242); The machine core main body (1241) is connected with the temperature compensation module to receive the second displacement value and transmit the second displacement value to the crank surface (1243) through the machine core shaft (1242), one end of the temperature compensation module is connected with the moving end of the second pressure detector (121) through the second end seat (122), the other end of the temperature compensation module is connected with the machine core main body (1241) of the control machine core unit (124), the machine core main body (1241) transmits linear arc motion of the second displacement value to the machine core shaft (1242) through the mechanical crank mechanism to be converted into rotary motion of the machine core shaft (1242), and drives the crank surface (1243) to move in an involute track according to the machine core shaft (1242) serving as a central axis, and the increase or decrease of the displacement of the crank surface (1243) on a point location is realized under the motion track.
  2. 2. The gas density relay according to claim 1, wherein the output action adjusting unit (125) is one or more, respectively corresponding to one or more crank surfaces (1243), and is fixedly mounted on the base (110) through a fixing frame (1254); The output action adjusting unit (125) includes a housing (1251), a trigger lever (1252), and a spring (1253).
  3. 3. The gas density relay of claim 2, wherein the trigger lever (1252) and spring (1253) are disposed inside a housing (1251), secured between a crank surface (1243) and a signal generator (126) by the housing (1251); The trigger rod (1252) is matched and assembled with the crank surface (1243), and moves up and down according to the action of the crank surface (1243) so as to output a switch action signal to the signal generator (126).
  4. 4. A gas density relay according to claim 3, characterized in that the spring (1253) is configured such that the output action adjusting unit (125) is in seamless engagement with the crankshaft face (1243).
  5. 5. The gas density relay of claim 4, wherein the trigger lever (1252) comprises a trigger drive lever (12521), a trigger adjuster (12522), and a lock nut (12523); the trigger adjusting piece (12522) is connected to the upper part of the trigger driving rod (12521) through threads and is fixed through a locking nut (12523); The length of the trigger adjusting piece (12522) is adjustable so as to adjust the size of the output switch action signal of the trigger rod (1252).
  6. 6. The gas density relay according to claim 1, wherein the first sensing module comprises a first pressure detector (111), one end of the first pressure detector (111) is connected to the base (110) of the relay in a sealing manner, and the other end is connected to one end of the temperature compensation module through a first end seat (112); The second sensing module comprises a second pressure detector (121), one end of the second pressure detector (121) is connected to the base (110) of the relay in a sealing mode, and the other end of the second pressure detector is connected with one end of the temperature compensation module through a second end seat (122).
  7. 7. The gas density relay according to claim 1, wherein the indication module comprises a display movement (114), a pointer (115) and a dial (116); one end of the display movement (114) is connected with the temperature compensation module, and the other end is connected with the pointer (115) and the dial (116).
  8. 8. The gas density relay according to claim 1, characterized in that the temperature compensation module comprises a temperature compensation element (113, 123); The temperature compensation elements (113, 123) comprise bimetallic strips made of bimetallic materials, and the two metals of the bimetallic strips have different thermal expansion coefficients.

Description

Double-pressure-measurement gas density relay Technical Field The embodiment of the invention relates to the technical field of power equipment monitoring, in particular to a double-pressure-measurement gas density relay. Background At present, sulfur hexafluoride (hereinafter referred to as SF 6) electrical products are widely applied to the electric power departments and industrial and mining enterprises, and the rapid development of the electric power industry is promoted. In the electric equipment in the electric power industry, the operation and normal operation of high-voltage electric equipment are not separated from sulfur hexafluoride gas media for arc extinction and insulation, so that in sulfur hexafluoride electric products provided with sealed sulfur hexafluoride gas chambers, it is an important basic requirement to ensure that the gas chambers do not leak gas, if gas leaks, the reduction of gas density will seriously affect the electric performance of the equipment, and serious hidden danger will be formed for the safe operation of the equipment. Meanwhile, with the development of the unattended transformer station to the networking and digitalization directions, on-line monitoring of the gas density state of SF 6 electrical equipment has been widely applied. The current gas density monitoring system (gas density relay) widely adopts a mode of collecting density, pressure and temperature and uploading data by using a remote SF 6 gas density relay to realize on-line monitoring of gas density. It is important to select a reliable remote density relay. In the conventional remote SF 6 gas density relay, the contact point of the remote SF 6 gas density relay adopts a magnetic-assisted electric contact, so that the problems of unreliable contact and short service life of the magnetic-assisted electric contact exist, and the remote SF 6 gas density relay has the advantages of reliable contact and long service life although the contact point of the remote SF 6 gas density relay adopts a micro switch. Disclosure of Invention The invention aims to provide a double-pressure-measurement gas density relay which realizes double-path pressure measurement of display and action, and improves the accuracy of gas density monitoring of gas-insulated or arc-extinguishing electrical equipment through an adjustable action module. In order to achieve the above object, according to one aspect of the present invention, there is provided a dual-pressure gas density relay comprising a first sensing module, a second sensing module, a temperature compensation module, an indication module, an action module and a signal generator, wherein, The first sensing module and the second sensing module are respectively arranged in the shell of the gas density relay, and output a first elastic deformation value and a second elastic deformation value which are related to the detected gas density change value when the gas pressure changes; The temperature compensation module is respectively connected with the first sensing module and the second sensing module, and converts the first elastic deformation value and the second elastic deformation value into a first displacement value and a second displacement output value respectively; The indication module is connected with the temperature compensation module, receives a first displacement value output by the temperature compensation module, and indicates a gas density change value corresponding to the first displacement value; the action module is connected with the temperature compensation module, receives a second displacement value output by the temperature compensation module, and outputs a switch action signal to the signal generator according to the second displacement value; The action module comprises an output action adjusting unit, and the output action adjusting unit receives the second displacement value and adjusts the magnitude of an output switch action signal according to the magnitude of the second displacement value. The action module further comprises a control movement unit, wherein the control movement unit comprises a movement main body, a movement shaft and a crankshaft surface, and the movement shaft is fixedly connected with the movement main body and vertically protrudes to one side far away from the temperature compensation module; The crankshaft faces are one or more and are arranged on the shaft of the protruding part of the machine shaft in parallel, and each crankshaft face is perpendicular to the shaft and moves along with the machine shaft. The temperature compensation module is connected with the movement main body of the control movement unit, the movement main body is connected with the temperature compensation module to receive the second displacement value and transmit the second displacement value to the crank surface through the movement shaft, one end of the temperature compensation module is connected with the moving end of the second pressure det