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A small current grounding line selection method and system

A technology of small current grounding and line selection method, applied in the direction of measuring electricity, measuring electrical variables, detecting faults by conductor type, etc., can solve problems such as errors, achieve high reliability, simple method, and improve the effect of correct action rate

Inactive Publication Date: 2020-08-25
李晓明
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] There is no screening process for the reliability of the zero-mode current input to the small-current grounding line selection device. If the zero-mode current input to the small-current grounding line selection device has been disturbed, no matter how good the criterion is, there will be errors

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  • A small current grounding line selection method and system

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] 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.

[0043] The fault quantity may be a zero-sequence component of power frequency, a high-order harmonic component, a zero-mode component containing high frequency, a zero-mode component of a certain spectrum section, or other fault characteristic quantities.

[0044]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 othe...

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Abstract

The invention discloses a small current grounding line selection method and system. The arc suppression coil current is obtained; the types and the practical fault state of a small current grounding system are judged; the matched line selection strategies and criteria are selected; the fault occurring points and fault lines are judged according to the line selection strategies and the criteria; acircuit breaker of a corresponding line is broken; if the fault disappears, the current fault line selection is completed; otherwise, the backup protection is performed. The features of the arc suppression coil current are used for judging the types of the practical operation system and the practical fault state; the proper line selection criteria are selected according to the judging result; thefault line election correct action rate is greatly improved; the automatic adaption to the arc suppression coil grounding system and the arc suppression coil midway quitting condition can be realized.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a small current grounding line selection method and system. Background technique [0002] The small current grounding system mainly includes the neutral point ungrounded system and the arc suppression coil grounding system. The neutral point high resistance grounding system is also a small current grounding system, but the neutral point high resistance grounding system has only theoretical significance and has no practical application. [0003] When a single-phase ground fault occurs in a small-current grounding system, the grounding current is relatively small. It is very difficult to select the fault line based on the weak fault quantity, and the correct action rate of the small-current grounding line selection device has not been high. The research on low-current grounding line selection methods with better performance and higher reliability has not be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 李晓明
Owner 李晓明
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