Single-phase ground fault section positioning method for 10kV distribution network

Abstract

Provided is a single-phase ground fault section positioning method for a 10kV distribution network. The inherent characteristics of the distribution network and the characteristics of fault location conditions and result characteristics in historical fault records are acquired from a power grid electrical information data source; the intrinsic characteristics of power grids are clustered as the input of self-organizing map neural network SOM, and the power grids with similar characteristics are grouped together; the fault location characteristics and the result characteristics of each type ofthe power grids are trained as input of generalized regression neural network GRNN to obtain fault location models of each type of the power grids; when a single-phase ground fault occurs during the operation of the power grids, based on the cluster type to which the power grids in which the fault occurs belongs, the fault location characteristics of each power grid supply section are input into the power grid fault location model corresponding to the type, and the fault section positioning result is obtained. The method has wide data source and high fault tolerance, and can quickly and accurately locate the faulty section.

Description

technical field [0001] The invention relates to the field of power grid operation management, in particular to a method for locating a single-phase ground fault section of a 10kV distribution network. Background technique [0002] The most prone fault in distribution network is single-phase-to-ground short-circuit fault (hereinafter referred to as single-phase-to-ground fault). Most of the 10kV distribution network in my country adopts the low-current grounding method. After a single-phase ground fault occurs, the line voltage is still symmetrical and the fault current is small. Although it does not affect the continuous power supply to the load temporarily, long-term operation may cause the fault to expand or damage electrical equipment. , so finding the fault location quickly and accurately is of great significance to the safe and stable operation of the distribution network. However, due to the large number of branch lines of the 10kV distribution network, it is difficult...

AI Technical Summary

Problems solved by technology

Most of the matrix algorithms are based on the monitoring devices installed in the distribution network, and need to use the signals monitored by fault indicators and feeder terminal units (FTU) for positioning, which largely depends on the distribution network FTU configuration, and due to The outdoor environment is harsh and misreporting is prone to occur. In addition, because only a single indicator is used and the fault tolerance is not high, positioning errors often occur

There are many branch lines in the 10kV distribution network, and the traveling wave method is easily affected by the transition resistance and the operation mode of the power grid, and because the wave velocity of the traveling wave in the hybrid line of the cable and the overhead line is inconsistent, and the traveling wave will frequently reflect at many line branch points , these will have a great impact on the accuracy of fault location

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