Intelligent grounding fault handling method for neutral point connected to ground via resistor in power distribution network

A ground fault and resistance grounding technology, which is applied to the fault location, detects faults according to conductor types, electrical components, etc., to achieve the effects of improving power supply reliability, increasing fault loop current, and solving personal safety problems

Active Publication Date: 2018-07-24
李景禄
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Problems solved by technology

[0004] Aiming at the problems existing in the current distribution network neutral point small resistance grounding mode, the present invention invents a grounding fault intelligent processing method in the distribution network neutral point resistance grounding mode

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  • Intelligent grounding fault handling method for neutral point connected to ground via resistor in power distribution network

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Embodiment Construction

[0011] When the distribution network is in normal operation, the resistance short-circuit switch works in the disconnected state, and the neutral point passes through R 1 and R 2 The middle resistance connected in series is grounded, which is used to limit the overvoltage in the distribution network. Measure the zero-sequence current of each feeder through the zero-sequence current transformer installed on each feeder, and measure the neutral point displacement voltage u through the neutral point voltage transformer N . Neutral point displacement voltage u N rises to the fault start voltage u Q when, that is: u N ≥u Q When it is judged that a single-phase grounding occurs in the distribution network, the zero-sequence current value of each feeder is detected by the zero-sequence current transformer of each feeder, and the single-phase grounding fault line is selected, and different zero-sequence currents are carried out according to the magnitude of the zero-sequence curr...

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Abstract

The invention discloses an intelligent grounding fault handling method for a neutral point connected to the ground via a resistor in the power distribution network, and aims at solving problems in grounding via low resistors of the neutral point in the power distribution network at present. Zero-sequence current transformers of different feed lines detect zero-sequence current values of the feed lines respectively, a line with a single-phase grounding fault is selected, the fault line is delayed according to the zero-sequence current value therein, the offset voltage uN of the neutral point isdetected again after delay time deltaT, and a fault property is determined; If uN>=uQ after deltaT, the fault is determined to be a permanent grounding fault; and if uN<uQ, the fault is determined tobe an instant grounding fault, and the fault is recovered within the time period deltaT. If Imax0 is greater than a limit blowout value, the fault line is cut off immediately without delay.

Description

technical field [0001] The invention mainly relates to the field of neutral point grounding of distribution networks, in particular to intelligent processing of single-phase grounding faults of distribution networks, and is suitable for single-phase grounding fault processing of 6-66kv distribution networks. Background technique [0002] Different neutral point grounding methods of distribution network have a significant impact on power supply reliability, internal overvoltage level and personal safety. The neutral point grounding methods of distribution network are: (1) neutral point is insulated from ground; (2) neutral point is grounded through arc suppressing coil; (3) neutral point is grounded through resistance, each grounding mode has different advantages and defects, as well as suitability. [0003] The distribution network neutral point small resistance grounding method is used in the distribution network with zero-sequence protection. During normal operation, the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/086H02H7/262Y04S10/52
Inventor 李政洋李景禄
Owner 李景禄
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