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Loop resistance test method for two-terminal-grounding circuit breaker

A technology of loop resistance and testing method, applied in circuit breaker testing, measuring resistance/reactance/impedance, instruments, etc., can solve problems such as no technical solutions, and achieve the effect of simple operation and simple structure

Active Publication Date: 2016-08-17
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although it discloses a variety of test circuits and test methods, it still fails to solve the above problems, and there is no technical solution to solve this problem in the prior art

Method used

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  • Loop resistance test method for two-terminal-grounding circuit breaker
  • Loop resistance test method for two-terminal-grounding circuit breaker
  • Loop resistance test method for two-terminal-grounding circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: A method for testing the loop resistance of a double-terminal grounding circuit breaker:

[0044] 1) Set the access point between the main circuit resistance and the ground wire and the shell resistance;

[0045] 2) An additional resistance module is set inside the access point, and an ammeter is set on the additional resistance module;

[0046] 3) Add an ammeter outside the main circuit resistance, ground wire and shell resistance and the additional resistance module, and set a total ammeter on both sides of the access point;

[0047] 4) The additional resistance module used is an adjustment resistance unit, and a 300A loop resistance tester is set between the access points.

[0048] 5) The resistance R of the main circuit 1 , current I 1 and standard resistor R 2 , current I 2 And ground grid and shell resistance R 3 , current I 3 The relationship between is satisfied, and the main loop resistance R 1 Less than or equal to 100μΩ, the ground and c...

Embodiment 2

[0053] Embodiment 2: The adjusting resistance unit includes a housing 1, a resistance unit 11 arranged inside the housing 1 and a terminal post 12 arranged outside, a conductive adjustment piece 5 is arranged on the upper part of the resistance unit 11, and a conductive adjustment sheet 5 is arranged on the conductive The lead post 10 at the rear of the adjustment sheet 5, the conductive adjustment sheet 5 adjusts the contact position of the conductive adjustment sheet 5 at the resistance unit 11 through a resistance adjustment member.

[0054] The inside of the housing 1 is a vacuum layer.

[0055] The resistance adjustment member includes a drive motor 9 , a lead screw 6 and an insulating support block 4 connected to the conductive adjustment sheet 5 .

[0056] A metal shield 8 is arranged outside the drive motor 9 .

[0057] The conductive adjusting piece 5 is in the shape of "┌", the outer surface of the conductive adjusting piece 5 is provided with an insulating coating ...

Embodiment 3

[0058] Embodiment 3: The adjusting resistance unit includes a housing 1, a resistance unit 11 arranged inside the housing 1 and a terminal post 12 arranged outside, a conductive adjustment piece 5 is arranged on the upper part of the resistance unit 11, and a conductive adjustment sheet 5 is arranged on the conductive The lead post 10 at the rear of the adjustment sheet 5, the conductive adjustment sheet 5 adjusts the contact position of the conductive adjustment sheet 5 at the resistance unit 11 through a resistance adjustment member.

[0059] The inside of the housing 1 is a vacuum layer.

[0060] The resistance adjustment member includes a drive motor 9 , a lead screw 6 and an insulating support block 4 connected to the conductive adjustment sheet 5 .

[0061] A metal shield 8 is arranged outside the drive motor 9 .

[0062] The conductive adjusting piece 5 is in the shape of "┌", the outer surface of the conductive adjusting piece 5 is provided with an insulating coating ...

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Abstract

The invention discloses a loop resistance test method for a two-terminal-grounding circuit breaker. Access points are arranged between a main loop resistor and a ground wire and shell resistor; an additional resistor module is arranged at the internal side of the access points, and an ammeter is arranged on the additional resistor module; and the ammeter is additionally arranged at the external part of the main loop resistor, the ground wire and shell resistor and the additional resistor module, and a total ammeter is arranged at the two sides of the access points, wherein the adopted additional resistor module is an adjusting resistor unit, and a 300A loop resistance tester is arranged between the access points. The circuit breaker of which loop resistance is less than or equal to 100 micro-ohm and the ground wire and shell resistance is 10-12mohm is detected, and the resistance adjusting component is adopted so that arbitrary control of the resistance value can be easily realized and the resistance value of main loop resistance can be accurately acquired; and the structure is simple and operation is easy and convenient so that the method is worthy of popularization and application.

Description

technical field [0001] The invention relates to the technical field of electric equipment testing methods, in particular to a loop resistance testing method of a double-terminal grounding circuit breaker. Background technique [0002] With the rapid development of my country's science and technology and economy, the coverage of the power grid is becoming more and more extensive and dense, the number of substations is increasing, and the equipment in the substations is becoming more diverse. At present, 500kV equipment widely adopts HGIS structure, and there are certain differences in the structure of equipment produced by different manufacturers. In particular, some special circuit breakers use aviation plugs to ground at both ends. This structure brings difficulties to some projects of high-voltage tests. The most obvious impact is the loop resistance test of the circuit breaker. This requires us to develop a test method for accurately measuring the circuit breaker circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327G01R27/02
CPCG01R27/02G01R31/3271
Inventor 郑远潼张倩旭赵胜男杨明丁双洋闫磊叶少坤秦柯鲁永李璐李琦
Owner STATE GRID CORP OF CHINA
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