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Zero-sequence current protection method and system for heavy-current grounding system

A zero-sequence current and grounding system technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of low sensitivity and reliability of starting components, and achieve improved reliability and sensitivity, high sensitivity, and small function setting values Effect

Inactive Publication Date: 2018-04-13
李晓明
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Problems solved by technology

However, when a single-phase ground fault occurs in a large-current grounding system, the zero-sequence voltage of the busbar is small. If the zero-sequence voltage of the busbar is greater than the set value as the starting element for the main criterion of fault line selection, the sensitivity and reliability of the starting element are relatively high. Small

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  • Zero-sequence current protection method and system for heavy-current grounding system

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[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0029] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention discloses a zero-sequence current protection method and system for a heavy-current grounding system. The method and system, by using a main criterion, control the operation of a zero-sequence current protection device, and use a state where neutral grounding zero-sequence current is greater than a setting value as the starting condition of the main criterion, or a state where the neutral grounding zero-sequence current is greater than a first setting value, and the variation of the neutral grounding zero-sequence current variation is greater than a second setting value as the starting condition of the main criterion. The neutral grounding zero-sequence current is taken as the starting component of the main criterion, and zero-sequence current protection has high reliability.

Description

technical field [0001] The invention relates to the field of relay protection of power systems, in particular to a zero-sequence current protection method and system for a large-current grounding system. Background technique [0002] Zero-sequence current protection has the advantages of simple structure and high reliability. However, if the distribution line is grounded with high resistance, the sensitivity of the existing zero-sequence current protection cannot meet the requirements. It is necessary to further improve the sensitivity of zero-sequence current protection. [0003] CN201710796428.5 describes a zero-sequence current protection method for a neutral point resistance grounding system, which uses the active component of the zero-sequence current to eliminate the adverse effects of the capacitive zero-sequence current on the line selection criterion. When a single-phase ground fault occurs in a small-current grounding system, the non-fault line has a large capaci...

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 李晓明
Owner 李晓明
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