A 10kV distribution line fault location method

Abstract

A 10 kV distribution line fault location method, the steps are as follows: (1) Determine whether the fault type is a two-phase short circuit or a three-phase short circuit; (2) If it is a three-phase short circuit fault, calculate the fault state voltage lagging behind the normal operating state (3) If it is a phase-to-phase short-circuit fault, calculate the current-voltage phase angle difference under the fault state; (4) According to the sampling information of the fault current, obtain the effective value of the three-phase short-circuit fault current or the two-phase short-circuit RMS value of fault current; (5) Comprehensive distribution line information to calculate the distance between the three-phase or two-phase short-circuit fault point and the beginning of the line. The method of the invention fully utilizes the fault information of the power distribution line, and can provide relatively accurate fault distance measurement results without increasing equipment, improves the operation and maintenance efficiency of the power distribution line, and reduces the operation and maintenance cost.

Description

technical field [0001] The invention relates to a fault location method for a 10kV power distribution line, which belongs to the technical field of power distribution networks. Background technique [0002] At present, power system fault location technology is widely used in the protection of 110kV and above voltage lines. For 10kV distribution lines, fault location and location need to use additional switches, fault indicators or other special detection devices installed on the line. The complexity of the line increases, and the cost of fault location is increased. Moreover, these methods are still limited to determining the fault interval, and the fault distance cannot be given more accurately, so that the search for the permanent fault point of the distribution line still requires a lot of manual inspection. Thus, the fault handling and fault recovery speed of distribution lines are limited. At the same time, the fault information of distribution lines has not been paid ...

AI Technical Summary

Problems solved by technology

[0002] At present, power system fault location technology is widely used in the protection of 110kV and above voltage lines. For 10kV distribution lines, fault location and location need to use additional switches, fault indicators or other special detection devices installed on the line. The complexity of the line increases, and the cost of fault location is increased. Moreover, these methods are still limited to determining the fault interval, and the fault distance cannot be given more accurately, so that the search for the permanent fault point of the distribution line still requires a lot of manual inspection. Thus limiting the fault handling and fault recovery speed of distribution lines

At the same time, the fault information of distribution lines has not been paid enough attention in the practice of operation and maintenance, so that the fault characteristics contained in the fault information itself are not fully utilized

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