Discrimination and treatment of long-span phase-to-phase short-circuit ground faults

Abstract

The invention discloses a method for judging and processing a large-span interphase short circuit grounding fault. A fault type and a fault region are comprehensively judged according to information of fault current which flows through each feed line switch by combining a zero sequence voltage criterion under an acquisition fault; and fault recovery is performed by adopting corresponding steps, so that the processing problem of the large-span interphase short circuit grounding fault can be solved well. The method is simple and practical, and complicated operation is not needed.

Description

technical field [0001] The invention relates to the field of fault processing of distribution networks, in particular to a method for distinguishing and processing long-span phase-to-phase short-circuit ground faults. Background technique [0002] The rapid and scientific treatment of distribution network faults is of great significance for improving the reliability of power supply of distribution network and realizing the economical and reliable operation of distribution network. Existing research on fault discrimination and fault handling in distribution network mainly focuses on phase-to-phase short-circuit faults and single-phase-to-ground short-circuit faults. [0003] In reality, the fault types of the distribution network are quite changeable. There are not only the possibility of single-phase ground short-circuit fault, two-phase ground short-circuit fault and phase-to-phase short-circuit fault, but also the possibility of large-span phase-to-phase short-circuit grou...

AI Technical Summary

Problems solved by technology

Existing fault diagnosis and treatment methods for phase-to-phase short-circuit and single-phase-to-ground short-circuit have different degrees of problems when applied to the identification and treatment of large-span phase-to-phase short-circuit faults: Fault diagnosis for two-phase-to-ground short-circuit and phase-to-phase short-circuit Generally, the difference between the short-circuit current and the processing method is not distinguished. As long as one phase of a feeder switch collects the fault current, it is considered that the feeder switch has passed the fault current. Therefore, it is impossible to distinguish two-phase grounding short-circuit faults in principle. , phase-to-phase short-circuit faults and large-span phase-to-phase short-circuit ground faults, which are likely to cause misplaced fault location results; the fault diagnosis and treatment methods for single-phase-to-ground short-circuits are generally complicated in principle and difficult to implement, and in fact When a short-circuit ground fault occurs, its fault current is much more obvious than that of a single-phase ground short circuit. At this time, it is economical and practical to use the fault diagnosis and treatment method for a single-phase ground short circuit to distinguish a large-span phase-to-phase short-circuit ground fault. sex is a matter of consideration

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