Ground fault detection method for power distribution network power transmission line

A ground fault and transmission line technology, which is applied in the field of detection of ground faults in distribution network transmission lines, can solve the problems of heavy workload of inspection personnel, achieve the effects of reducing daily maintenance workload, shortening maintenance time during power outages, and improving work efficiency

Inactive Publication Date: 2021-03-12
TIELING POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER COMPANY +1
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Problems solved by technology

[0003] In view of the ground fault phenomenon that often occurs in transmission lines, if the existing method is to manually pull the load switch and then close it to find the ground point, it will bring a lot of workload to the inspection personnel and require the inspection Inspection personnel need to have relevant experience in judging the location of the fault and how to deal with it

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Embodiment Construction

[0014] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0015] A method for detecting a ground fault of a transmission line in a distribution network, comprising the following steps:

[0016] Step 1, collect the three-phase current value in the transmission line in real time;

[0017] Step 2, detect the ground fault according to the sampled three-phase current, and obtain the time point t corresponding to the moment when the ground fault has just been detected;

[0018] Step 3. Determine whether it is a single-phase ground fault or a two-phase ground fault according to the three phase c...

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Abstract

The invention relates to a ground fault detection method for a a power distribution network power transmission line. The method comprises the following steps: acquiring a three-phase current value inthe power transmission line in real time; detecting a ground fault according to the sampled three-phase current, and obtaining a time point t corresponding to the moment when the ground fault is justdetected; determining whether the fault is a single-phase ground fault or a two-phase ground fault according to the three phase current break variables and the current amplitudes at the moment t; andafter the ground fault is determined, generating a fault alarm signal and sending the fault alarm signal to an intelligent terminal corresponding to the branch line through a wireless communication device. According to the invention, the fault occurrence area and the fault occurrence time can be timely, rapidly and accurately determined, and the fault occurrence rate is reduced.

Description

technical field [0001] The invention relates to a ground fault detection method, in particular to a ground fault detection method of a power transmission line of a distribution network. Background technique [0002] The transmission line is responsible for the transmission and distribution of electric energy and is an important part of the power grid. Whether its safe and reliable operation is of great significance to the safety and stability of the entire power grid. Through the real-time monitoring of the ground fault point at the ground fault point of the transmission line, it is beneficial to grasp the influence of the ground fault on the thermal stability and dynamic stability of the transmission line in time, and provide a reliable decision-making basis for ensuring line safety and grid stability. [0003] In view of the ground fault phenomenon that often occurs in transmission lines, if the existing method is to manually pull the load switch and then close it to find ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52
CPCG01R31/52
Inventor 张永谦朱艳红高源赵月胡鑫
Owner TIELING POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER COMPANY
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