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A method of loop resistance measurement under the condition of single string and multiple switches connected in series in gis

A technology of loop resistance and measurement method, which is applied in the direction of measuring device, measuring electrical variable, measuring resistance/reactance/impedance, etc., which can solve the problem that the safe operation of the power system is not allowed, and achieve the effect of accurate measurement

Active Publication Date: 2019-09-24
CHINA YANGTZE POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the entire GIS system adopts a fully enclosed structure, if the SF6 circuit breaker is measured according to the traditional method, all switches in the GIS within a single string must be powered off. In some stations, the entire station may need to be powered off to meet the safety conditions of the test. But this is not allowed for the safe operation of the power system
Therefore, there is currently no reliable method to measure SF6 circuit breakers in GIS alone

Method used

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  • A method of loop resistance measurement under the condition of single string and multiple switches connected in series in gis

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Embodiment Construction

[0012] A loop resistance measurement method under the condition of single string and multiple switches connected in series in GIS, using the timing of GIS power outage maintenance, by switching different grounding knife switch lead-out terminals, and applying current and voltage on the lead-out terminals, using the switch in the string to separate In the event of a power outage, the contact resistance of the switch and the grounding knife switch circuit is measured in stages, and through simple algebraic calculations, the influence of the contact resistance error caused by the grounding knife switch contact is eliminated.

[0013] figure 1 It is a typical 3 / 2 wiring diagram, the main equipment and components are:

[0014] (1): Two busbar units: busbar unit 1M and busbar unit 2M; their grounding switches are grounding switch 117 and grounding switch 217 respectively.

[0015] (2): Three SF6 circuit breaker units: 1# SF6 circuit breaker unit, 2# SF6 circuit breaker unit, 3# SF6...

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Abstract

The invention discloses a loop resistance measuring method under a serial connection condition of a single string and multiple switches in a GIS. The loop resistance measuring method utilizes a power-off overhauling opportunity of the GIS, switches different grounding knife switch leading-out terminals, applies current and voltage to the leading-out terminals, utilizes an opportunity that in-string switches are power off in times, performs grading measurement on contact resistance of the switches and a grounding knife switch loop, and eliminates the influence on contact resistance errors caused by grounding knife switch contacts through simple algebraic calculation. The loop resistance measuring method can make up for the deficiency that resistance of a GIS circuit breaker loop cannot be measured under a fully-enclosed structure.

Description

technical field [0001] The invention relates to a loop resistance measuring method under the condition of a single string and multiple switches connected in series in a GIS, and relates to the technical field of power system safety. Background technique [0002] With the continuous improvement of substation capacity and voltage level, gas insulated switch system (GIS) has been widely used in power system. In order to evaluate whether the contact state of SF6 circuit breaker contacts is good, the loop resistance test of the switch is an essential test item. However, since the entire GIS system adopts a fully enclosed structure, if the SF6 circuit breaker is measured according to the traditional method, all switches in the GIS within a single string must be powered off. In some stations, the entire station may need to be powered off to meet the safety conditions of the test. But this is not allowed for the safe operation of the power system. Therefore, there is currently no ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01R31/12
Inventor 李广余维坤覃国茂罗小鹏
Owner CHINA YANGTZE POWER