Method for locating single-phase grounding fault in distribution network

Abstract

A method for locating a single-phase ground fault in a distribution network relates to the technical field of distribution networks and solves the technical problem of reducing the cost of identifying and locating a single-phase ground fault. This method divides each outgoing line of the distribution network bus equidistantly into multiple outgoing line sections, and then simulates single-phase ground faults one by one for each outgoing line section under non-fault conditions, and calculates the In the case of a phase-to-ground fault, the simulated value of the negative-sequence current fault on the bus-side and the zero-sequence current fault on the bus-side of the outgoing line at the bus outlet; when a single-phase-to-ground fault occurs in the distribution network, the simulated Values ​​are used to judge all outgoing lines of the distribution network bus one by one to realize the identification and location of single-phase ground faults. The method provided by the invention is suitable for locating single-phase grounding faults in distribution networks.

Description

technical field [0001] The invention relates to distribution network technology, in particular to a technology for locating a single-phase ground fault in a distribution network. Background technique [0002] Most distribution networks operate in non-effective grounding mode. When a single-phase ground fault occurs in the distribution network, since the short-circuit current is grounded through the arc suppression coil, the grounding current is very small, and the distribution network is three-phase in normal operation. Phase asymmetric operation, there is a negative sequence current, so the single-phase ground fault of the distribution network is often difficult to identify, even if it is identified, it is difficult to locate the fault area. It is often necessary to configure special detection equipment to assist identification and positioning, thereby increasing cost of the distribution network. Contents of the invention [0003] In view of the above-mentioned defects i...

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Problems solved by technology

[0002] Most distribution networks operate in non-effective grounding mode. When a single-phase ground fault occurs in the distribution network, since the short-circuit current is grounded through the arc suppression coil, the grounding current is very small, and the distribution network is three-phase in normal operation. Phase asymmetric operation, there is a negative sequence current, so the single-phase ground fault of the distribution network is often difficult to identify, even if it is identified, it is difficult to locate the fault area, and it is often necessary to configure special detection equipment to assist identification and positioning, thereby increasing cost of the distribution network

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