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A low-current grounding fault line selection system and method with backup function

A technology of small current grounding and fault line selection, which is applied in the direction of fault location, fault detection according to conductor type, and protection in response to fault current. Problems such as manual switching of faulty lines, to achieve the effect of improving the correct action rate, high reliability, and high sensitivity

Inactive Publication Date: 2019-07-09
李晓明
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  • Abstract
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Problems solved by technology

Due to the low correct action rate of the existing small current grounding fault line selection method and its devices, it often causes manual switching of non-fault lines and power outages, which reduces the power supply reliability of the power system

Method used

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  • A low-current grounding fault line selection system and method with backup function
  • A low-current grounding fault line selection system and method with backup function
  • A low-current grounding fault line selection system and method with backup function

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. 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 invention belongs.

[0034] It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. 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 combinations thereof.

[0035] As...

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Abstract

Disclosed in the present invention are a small-current grounding fault line selection system and method having a backup function; when a main protection malfunctions and circuit breakers of non-fault lines trip, a backup protection system calculates the integrals of absolute values of changes in failure quantity before and after the tripping of the circuit breakers of lines; and a backup protection tripping line is determined in accordance with the characteristics of the integrals, achieving rapid response of backup protection. In the present invention, the backup protection can trip a fault line quickly, improving the reliability of protection.

Description

technical field [0001] The invention relates to a small current grounding fault line selection system and method with backup function. Background technique [0002] When a single-phase ground fault occurs in a small-current grounding power system, the grounding current is relatively small, and the line selection device for small-current grounding faults may malfunction. The highest correct action rate of the existing small current grounding fault line selection device is only 99%. The common disadvantage of the existing small current ground fault line selection devices is that they have no backup function. Once a wrong line selection occurs in the small current grounding fault line selection device, the faulty line can only be found by manually switching off the power one by one. Due to the low correct action rate of the existing small current grounding fault line selection method and its device, manual switching of non-fault lines and power failures are often caused, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
CPCG01R31/52G01R31/086H02H3/16
Inventor 李晓明
Owner 李晓明
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