Low-current grounding fault positioning and alarming method based on fault indicator

A fault indicator, small current grounding technology, applied in fault location, short circuit test, etc., can solve problems that need to be improved, achieve the effect of reducing daily maintenance workload, shortening power failure maintenance time, 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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  • Abstract
  • Description
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Problems solved by technology

But at present, when the small current grounding system fails, the technology to find the fault line in time and correctly needs to be improved

Method used

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Embodiment Construction

[0020] 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.

[0021] The method for locating and alarming a small current grounding fault based on a fault indicator comprises the following steps:

[0022] Step 1, time-synchronizing the acquisition units of the fault indicators of each phase, and at the same time, the acquisition units of each phase synchronize the positions of the current sampling points and the positions of the voltage sampling points;

[0023] Step 2, the acquisition units of each phase are triggered synchronously, and the current data and voltage data of each phase during t...

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Abstract

The invention relates to a low-current grounding fault positioning and alarming method based on a fault indicator. The method comprises the following steps: synchronously acquiring current data and voltage data of each phase of a low-current grounding system line in a fault period in real time; when it is determined that the small-current grounding fault occurs, injecting a capacitive load into abus-side non-fault phase of the transformer substation with the fault, and exiting the capacitive load after a certain period of time; determining a specific fault area of the fault by analyzing the current variation within a certain delay time before and after the capacitive load injection; and sending the fault information to a line patrol personnel mobile terminal. 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 method for locating a small current grounding fault, in particular to a method for locating and alarming a small current grounding fault based on a fault indicator. Background technique [0002] The distribution network is composed of overhead lines, cables, towers, distribution transformers, isolating switches, reactive power compensators and some auxiliary facilities, etc. It is a network that distributes electric energy in the power network. The distribution network is huge and complex, with many branches and a large number of equipment, so the fault location is highly complex. [0003] Ungrounded or small current grounding methods are widely used in the neutral point of distribution network, and the main fault form in distribution network is single-phase ground fault, accounting for more than 80% of the total faults, which seriously affects the normal life of users. After a fault occurs in the distribution network, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/08G01R31/52
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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