Power distribution network fault section accurate positioning method based on wide-area zero-sequence current distribution information

Abstract

The invention discloses a power distribution network fault section accurate positioning method based on wide-area zero-sequence current distribution information. Wave recording type fault indicators are arranged on each power distribution line every a certain distance; the distance between every two fault indicators is a section; when a single-phase earth fault occurs on the line, the fault indicators arranged along the line are started and record zero-sequence current amplitudes; and according to the difference of along-line distribution of the zero-sequence current amplitudes of the fault line and the non fault line, and based on given rules, the fault section is judged. The power distribution network fault section accurate positioning method based on the wide-area zero-sequence currentdistribution information is not affected by the transition resistance and a fault initial angle; for whether a neutral non-grounding system or a resonant grounding system, the fault section can be determined by utilizing the measured value of the fault indicator rapidly and reliably; and in addition, effective judgment also can be carried out when a bus fault occurs, so that the method has relatively high practical application values.

Description

technical field [0001] The invention relates to the design field of power line fault location in a power system, in particular to a method for accurately locating a distribution network fault section based on wide-area zero-sequence current distribution information. Background technique [0002] Single-phase ground faults have the highest probability of occurrence in small current grounding systems. Although the system is allowed to operate with the fault for a period of time after a single-phase ground fault occurs, if the fault is not quickly and accurately checked and eliminated, it is easy to develop into a serious short-circuit fault, affecting the safe and reliable operation of the system and causing huge losses. At present, the common fault section location method can usually only judge a section of the line where the fault point is located. The fault location range is relatively wide, and maintenance personnel still need to patrol the line for a long distance to find...

AI Technical Summary

Problems solved by technology

Although the system is allowed to operate with a fault for a period of time after a single-phase ground fault occurs, if the fault is not quickly and accurately checked and eliminated, it is easy to develop into a serious short-circuit fault, affecting the safe and reliable operation of the system and causing huge losses

At present, the common fault section location method can usually only judge a section of the line where the fault point is located. The fault location range is relatively wide, and maintenance personnel still need to patrol the line for a long distance to find the fault point.

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