A divisional fault handling method for distribution network neutral point resistance grounding mode

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

Active Publication Date: 2019-03-26
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 U N 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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  • A divisional fault handling method for distribution network neutral point resistance grounding mode

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Embodiment Construction

[0011] When a single-phase ground fault occurs in the distribution network, according to the distribution network neutral point displacement voltage U N 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; when the distribution network neutral point displacement voltage U N Greater than the fault start voltage U Q , it is determined that a single-phase ground fault has occurred in the distribution network, when U Q ≤ U N ≤ U GL When U GL N ≤ U ZL , it is a medium-resistance grounding fault, and the faulty line is selected by the grounding line selection method, and after a delay of ΔT, the neutral point displacement voltage U of the distribution network is tracked and checked N size if: U N Q , indicating that the fault is a transient fault, and the fault has been recovered, if: U N ≥U Q , indicating that the fault has not been recovered, and the fa...

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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 Patents(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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