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Power distribution network neutral point resistance earthing mode partition fault processing method

A fault handling method, resistance grounding technology, applied to the fault location, detecting faults according to conductor types, electrical components, etc., to achieve the effect of improving the reliability of power supply

Active Publication Date: 2017-10-20
李景禄
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Problems solved by technology

[0003] Aiming at the problems existing in the current distribution network neutral point small resistance grounding mode, the invention invents a distribution network neutral point resistance grounding mode divisional fault processing method, and the distribution network adopts the medium resistance grounding mode for single-phase grounding When processing the fault, according to the grid neutral point displacement voltage The size of the distribution network single-phase ground fault is divided into different ground fault areas and different processing methods are used to meet different needs

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  • Power distribution network neutral point resistance earthing mode partition fault processing method

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Embodiment Construction

[0011] When the neutral point of the distribution network adopts the medium resistance grounding method to deal with the single-phase ground fault, according to the displacement voltage of the neutral point of the power grid The size of the single-phase ground fault in the distribution network is divided into different ground fault areas and different processing methods are used to meet different needs. When the neutral point displacement voltage of the distribution network Greater than fault start voltage When , it is determined that a single-phase ground fault has occurred in the distribution network, when , it is a high-resistance grounding fault area, and the faulty line is selected and quickly cut off through grounding line selection to prevent personal safety accidents; When , it is a medium-resistance grounding fault area, and the faulty line is selected through the grounding line selection, and the time delay Then track and check the grid neutral point displac...

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Abstract

When a power distribution network employs a resistance earthing mode to perform processing of single-phase earth fault, the power distribution network single-phase earth faults are divided into different earthing fault areas according to the size of a power grid network neutral displacement voltage UN and employ different processing modes to satisfy different requirements. A fault circuit can be accurately selected and cut off when the power distribution network generates high-resistance faults such as single-phase earth faults or personal electric shock so as to ensure the device and personal safety; and when the power distribution network employs time delay when the generation of the single-phase earth faults to recover the part of faults and improve the power supply reliability. When the power distribution network generates low-resistance earth faults so as to accurately select and cut off fault circuits and avoid fault enlargement.

Description

technical field [0001] The invention mainly relates to the field of neutral point grounding of a distribution network, and particularly refers to a partitioned fault processing method of a neutral point resistance grounding mode of a distribution network, which is suitable for single-phase grounding fault processing of a 6-66kv distribution network. Background technique [0002] The distribution network neutral point small resistance grounding method is used in the distribution network with zero-sequence protection. During normal operation, the overvoltage level is low. When a single-phase ground fault occurs, the faulty line is cut off through zero-sequence protection. The grounding method has a simple structure and has been widely used in urban power grids. However, the biggest defect of this grounding method is that once a high-impedance grounding such as single-phase disconnection or personal electric shock occurs in the distribution network, the zero-sequence protection ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/086H02H7/26
Inventor 李政洋李景禄林俊超
Owner 李景禄
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