Method for detecting cable early fault of low-current grounding system

A technology of small current grounding and early faults, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as early fault detection of cables

Active Publication Date: 2020-12-01
HOHHOT POWER SUPPLY BUREAU OF INNER MONGOLIA POWER GRP CO LTD
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  • Abstract
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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, a method for detecting early faults of cables in small current grounding systems provided by the present invention solves the problem of early fault detection of cables in small current grounding systems

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  • Method for detecting cable early fault of low-current grounding system
  • Method for detecting cable early fault of low-current grounding system
  • Method for detecting cable early fault of low-current grounding system

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[0039] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0040] Early fault refers to an intermittent and transient fault that occurs before the permanent fault of the equipment. It has the characteristics of short duration or low current amplitude. In this fault disturbance mode, it will not cause the action of the relay protection device. These types of failures recur over time and eventually lead to permanent failures.

[0041] Such as figure 1 As shown, a method for detectin...

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Abstract

The invention discloses a method for detecting a cable early fault of a low-current grounding system. The method comprises the steps: analyzing the characteristics of the zero-sequence voltage waveform signal sampled due to the early fault of the cable through wavelet transform, extracting a zero-sequence voltage fundamental frequency band signal, judging the early fault of the cable from the dimensions of the root-mean-square value and the duration of the zero-sequence voltage fundamental frequency band, and taking the duration of the zero-sequence voltage exceeding a threshold value as the duration of the early fault, thereby determining the early fault of the cable.

Description

technical field [0001] The invention relates to the field of power line control, in particular to a method for detecting early faults of cables in a small current grounding system. Background technique [0002] The existing early fault detection methods generally select the fault phase current as the feature quantity, and then use signal processing or deep learning methods to identify it. However, these methods are aimed at large-current grounding systems (neutral point is directly grounded), while my country's medium-voltage distribution network mainly adopts small-current grounding methods. Most of the early cable faults are single-phase ground faults. When a fault occurs in a large-current grounding system, the magnitude of the fault current changes significantly, and the characteristics of the fault phase current are easier to extract. However, for small current grounding systems, the single-phase ground fault current is small, which brings challenges to early fault de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/58
CPCG01R31/58Y04S10/52
Inventor 胡婧周洋何志强刘兵卢凯
Owner HOHHOT POWER SUPPLY BUREAU OF INNER MONGOLIA POWER GRP CO LTD
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