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Method for monitoring SF6 density relay in real time and pre-judging gas leakage

A density relay and real-time monitoring technology, which is applied in the direction of measuring the increase and deceleration rate of the fluid, using the liquid/vacuum degree to measure the liquid tightness, instruments, etc., can solve the problem that the air leakage cannot be predicted, and the gas density relay cannot be monitored in real time, etc. problems, to achieve the effects of convenient monitoring and early warning, accurate compensation, and guaranteed accuracy and safety

Pending Publication Date: 2021-12-07
HENAN PINGGAO ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For existing SF 6 The problem that the gas density relay cannot be monitored in real time and the gas leakage cannot be predicted, the present invention provides a 6 A method for real-time monitoring and prediction of air leakage by density relay

Method used

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  • Method for monitoring SF6 density relay in real time and pre-judging gas leakage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for real-time monitoring and pre-judging air leakage of SF6 density relays, comprising the following steps:

[0043] S1: Pressure and temperature integrated sensor 4 pairs of SF 6 SF inside a density relay 6 Gas real-time detection pressure value; SF 6 Density relays are used to monitor SF in closed containers 6 The density value of the gas, in order to facilitate the unification of inflation and monitoring standards, the industry often uses P 20 The value is the pressure value at 20°C to characterize; the pressure and temperature integrated sensor 4 real-time SF 6 The gas in the density relay is detected, and its specific model can be TE's 89BSD-012BA-8. The sensor has high measurement accuracy, small compensation error, accuracy ±0.3%, and wide operating temperature range -40 ° C ~ +85 ° C; preferred In this implementation, the pressure and temperature integrated sensor 4 is directly connected to the SF 6 SF inside a density relay 6 Gas contact and dete...

Embodiment 2

[0056] Basically the same as embodiment 1, such as figure 1 As shown, in this implementation SF 6 The density relay includes a housing 1, which plays the role of overall sealing and support; the housing 1 is connected to the external pressure vessel through the joint 5, and the external pressure vessel is loaded with SF 6 gas container, the SF inside the container 6 The gas enters the housing 1 through the connection 5 . The housing 1 is provided with a spring tube 2 and a transmitter 3. One end of the spring tube 2 is connected to the joint 5. The spring tube 2 is a pressure-sensitive element. Because the spring tube 2 is hollow inside, SF 6 The gas enters the spring tube 2 directly through the connection 5, SF 6 The gas rushes into the spring tube 2 to elastically deform it. The spring tube 2 is equipped with a pressure and temperature integrated sensor 4, which is electrically connected to the transmitter 3, and the transmitter 3 is embedded with a chip to calculate the...

Embodiment 3

[0060] Basically the same as embodiment 2, in order to further improve the overall work efficiency, the steps S3 and S4 can be replaced by the following steps:

[0061] S5: put T 1 ~T 2 Several equivalent pressure values ​​within the time period are compared with the threshold value one by one, if the threshold value is exceeded, it will be recorded once, and when the recording times exceed the preset value, the SF will be judged 6 Density relay leaks, the threshold value is -0.035Mpa, the preset value here can be set according to the specific situation, while ensuring T 1 ~T 2 The time period goes through three stages of temperature rise, constant temperature and temperature drop to ensure the comprehensiveness of data collection, avoid large errors in short-term measurement, and improve the accuracy of the entire judgment process; by recording the number of times exceeding the threshold and setting the value Compare and judge SF 6 The density relay leaks air, the judgmen...

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Abstract

The invention discloses a method for monitoring an SF6 density relay in real time and pre-judging gas leakage and belongs to the field of SF6 gas monitoring. Aiming at problems that the existing SF6 density relay cannot monitor in real time and gas leakage is not predictable, the invention provides a method for monitoring the SF6 density relay in real time and pre-judging the gas leakage. The method comprises the following steps of detecting a pressure value of gas in the SF6 density relay in real time by a pressure and temperature integrated sensor; converting the real-time pressure value into a pressure value at 20 DEG C, wherein the converted pressure value is called as an equivalent pressure value; comparing the equivalent pressure value with a standard pressure value to obtain an equivalent pressure change curve; and when the equivalent pressure change curve is greater than the set point and is continuously increased, judging that the SF6 density relay leaks gas. According to the method, real-time monitoring can be realized, the gas condition in the SF6 density relay can be mastered at any time, and monitoring and early warning are facilitated; and meanwhile, a standard is established to judge whether the SF6 density relay leaks gas so that judgment accuracy is ensured, and monitoring stability is improved.

Description

technical field [0001] The invention belongs to SF 6 The technical field of gas monitoring, more specifically, relates to a method for real-time monitoring and pre-judging gas leakage of SF6 density relays. Background technique [0002] SF 6 The gas has good insulation and arc extinguishing properties, its breakdown voltage is 2.5 times that of air, and its arc extinguishing ability is 100 times that of air, so SF 6 Gas is widely used in the power industry and has promoted the rapid development of the power industry. But SF 6 The gas is also colorless, odorless, non-flammable, and its density is 5.1 times that of air. Its electrolyte is poisonous. The greenhouse effect of a single molecule is 22,000 times that of carbon dioxide, and its lifespan is about 3400 years. One, so it is very important to monitor the SF6 gas in the equipment. In the past, the condition maintenance of substation equipment needed to arrange regular inspections by full-time personnel, which took u...

Claims

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Application Information

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IPC IPC(8): G01M3/26G01L19/00
CPCG01M3/26G01L19/00G01L2019/0053
Inventor 韩项峰王庆利王志伟杜刚吴超李泽元陈金钟何涛霍思宏颜晓雯张彦飞李晓峰王雪洋胡煜
Owner HENAN PINGGAO ELECTRIC
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