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Power distribution network single-phase earth fault detection system and method

A single-phase ground fault detection system technology, applied in the radio wave measurement system, satellite radio beacon positioning system, fault location, etc., can solve the problems of difficulty in determining the amplitude detection threshold and misjudgment, and improve the accuracy of fault location Effect

Pending Publication Date: 2020-05-29
戚宇林
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a distribution network single-phase ground fault detection system and method, which can effectively solve the problem that the amplitude detection threshold is difficult to determine and misjudgment often occurs in the existing detection process

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  • Power distribution network single-phase earth fault detection system and method
  • Power distribution network single-phase earth fault detection system and method
  • Power distribution network single-phase earth fault detection system and method

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Embodiment Construction

[0039] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0040] The purpose of the present invention is to synchronously inject voltage AC signals at both ends of the fault phase when a ground fault occurs in the distribution network. The hand-held detector uses the dichotomy method to detect the phase along the line, and the point where the current phase reverses is the fault point.

[0041] The invention includes two parts: a synchronous signal source and a synchronous detector. The signal source voltage at both ends is injected into the signal with the same phase, which is called synchronization. Synchronous signal source technical solutions such as figure 1 shown.

[0042] see figure 1 , the synchronization signal...

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Abstract

The invention provides a power distribution network single-phase earth fault detection system and method. The system comprises two synchronous signal sources which are respectively arranged at two endpoints of a fault line and simultaneously and synchronously inject high-voltage signals with completely consistent voltage waveforms into the fault line at two ends of a fault phase under GNSS time reference control; because the current reference direction is from one signal source to the other signal source, the current phases of the fault lines at the two sides of a fault point are opposite. The system further comprises a synchronous detector which is used for determining a grounding fault point by detecting a current phase inversion point on the fault line under GNSS time reference control. The power distribution network single-phase earth fault detection system and method provided by the invention can effectively solve the problems that the amplitude detection threshold is difficult to determine and misjudgment often occurs in the existing detection process.

Description

technical field [0001] The invention relates to the technical field of distribution network automation, in particular to a single-phase ground fault detection system and method of a distribution network. Background technique [0002] Distribution network single-phase ground fault location separation line detector method and online real-time fault location method. Off-line detector method is divided into AC method and DC method. [0003] The AC method means that after a line fault occurs, the power is cut off, an AC signal is injected into the fault phase, and then the hand-held detector is used to find the fault point along the line with the dichotomy method, and the ground detection does not need to climb the pole. [0004] The DC method means that after a fault occurs on the line, the power is cut off, and a DC signal is injected into the faulty phase, and then the clamp ammeter is used to find the fault point along the line with the dichotomy method. During the detection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01S19/14
CPCG01R31/086G01S19/14Y04S10/52
Inventor 戚宇林
Owner 戚宇林
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