Single-phase earth fault positioning method for power distribution network

Abstract

The invention discloses a single-phase earth fault positioning method for a power distribution network, and relates to the technical field of power distribution networks. The recognizing cost and the positioning cost of a single-phase earth fault can be lowered. According to the method, each outlet line of a power distribution network busbar is divided into a plurality of line outlet sections in an equidistance mode, then, the single-phase earth fault is simulated on all the line outlet sections one by one under the non-fault condition, and the busbar side negative-sequence current fault simulation value and the busbar side zero-sequence current fault simulation value of one outlet line which each line outlet section belongs to at a busbar outlet are calculated when the single-phase earth fault is simulated; when the single-phase earth fault happens to the power distribution network, all the outlet lines of the power distribution network busbar are judged one by one according to the simulation values under the non-fault condition, and thus the single-phase earth fault can be recognized and positioned. The single-phase earth fault positioning method for the power distribution network is suitable for positioning the single-phase earth fault in the power distribution network.

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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