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Method and device for evaluating capacitive closing performance of phase-selection closing switch equipment

A switchgear, phase selection and closing technology, used in measuring devices, instruments, measuring electricity, etc.

Active Publication Date: 2020-10-23
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]In view of this, the present invention proposes a method and device for evaluating the capacitive closing performance of phase-selection closing switchgear, aiming at solving the problem of phase-selection closing switchgear The problem of accurate evaluation of the capacitive making performance of the

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  • Method and device for evaluating capacitive closing performance of phase-selection closing switch equipment
  • Method and device for evaluating capacitive closing performance of phase-selection closing switch equipment
  • Method and device for evaluating capacitive closing performance of phase-selection closing switch equipment

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Embodiment 1

[0058] In one embodiment, the filter group circuit breaker used in a certain converter station is a phase-selection closing switchgear, and when the phase-selection closing device is not used, its closing inrush current is the maximum value I CM 20kA. The closing time point t of the phase selection closing device equipped with the switchgear 1 Selected as 1.2ms, constant α selected as 1.8. The first test is a standard C2 level capacitive current closing test, and the phase selection closing switchgear is closed for 120 times in the first test; the second test is a capacitive current closing margin test, and the phase selection closing switchgear is in the second test The number of reliable closing times is 480.

[0059] The method for evaluating the capacitive closing performance of the phase selection closing switchgear provided in this embodiment includes:

[0060] Step S201: Obtain the result of the first test of the phase selection closing switchgear;

[0061] Step S20...

Embodiment 2

[0094] In one embodiment, the filter group circuit breaker used in a certain converter station is a phase-selection closing switchgear, and when the phase-selection closing device is not used, its closing inrush current is the maximum value I CM 20kA. The closing time point t of the phase selection closing device equipped with the switchgear 1 Selected as 1.2ms, constant α selected as 1.8. The first test is a standard C2 level capacitive current closing test, and the phase selection closing switchgear is closed for 120 times in the first test; the second test is a capacitive current closing margin test, and the phase selection closing switchgear is in the second test The number of reliable closing times is 480.

[0095] The evaluation device for the capacitive closing performance of the phase selection closing switchgear provided in this embodiment includes:

[0096] The first data acquisition unit 301 is configured to acquire the result of the first test of the phase selec...

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Abstract

The invention discloses a method and a device for evaluating capacitive closing performance of phase-selection closing switch equipment. The method comprises the following steps of: according to accumulated arc energy Qs1 in a closing pre-breakdown process in a first test, arc energy Qs2 in a primary closing pre-breakdown process in a second test of the phase-selection closing switch equipment, areliable closing frequency A in the second test and average arc energy Qa of single closing of the phase-selection closing switch equipment in an actual operation condition, calculating to obtain a first ratio M=Qs1 / Qa and a second ratio N=Qs2 / Qa; and calculating to obtain a reliable closing frequency X=M+A*N in the actual operation condition of the phase-selection closing switch equipment based on the reliable closing frequency A, the first ratio M and the second ratio N in the second test. Through adopting the method and the device provided by the embodiment of the invention, the capacitiveclosing performance of the phase-selection closing switch equipment can be accurately evaluated.

Description

technical field [0001] The invention relates to the field of electrical equipment testing, in particular to a method and device for evaluating the capacitive closing performance of a phase selection closing switchgear. Background technique [0002] The UHV power grid has a large power adjustment range, and the AC filter bank or reactive power compensation capacitor bank has a large capacity and frequent switching, which requires high capacitive closing performance of the switchgear. When the switchgear closes the AC filter bank or capacitor bank, a high-frequency inrush current will be generated. The amplitude of the inrush current is several to dozens of times larger than the normal operating current, and the frequency can reach several thousand Hz, which may easily cause contact welding and burning. , parts damage and insulation damage, etc. [0003] In order to suppress the closing inrush current, some switchgear adopts the phase selection control scheme, and selects the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/3271Y02E40/30
Inventor 刘泽洪吴昱怡崔博源王承玉王绍武陈允张进刘焱
Owner CHINA ELECTRIC POWER RES INST
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