Method for positioning and ranging inter-phase short-circuit fault section of power distribution network

Abstract

The invention discloses a power distribution network phase-to-phase short circuit fault section positioning and distance measuring method. Relates to the technical field of power distribution network fault detection, in particular to a power distribution network phase-to-phase short circuit fault section positioning and distance measuring method based on line voltage distribution characteristics. The method comprises the following steps: acquiring real-time power frequency line voltage amplitude information of a fault line when an inter-phase short-circuit fault occurs in a distribution line by using a power distribution terminal of a power distribution network automation system, and selecting the minimum one of three line voltage amplitudes acquired by each terminal as the minimum line voltage of the terminal; according to the direction from the bus to the tail end of the line, the minimum line voltages of the two adjacent terminals are sequentially subtracted, the absolute value is obtained, and line voltage drop of each section with the two adjacent terminals as the section is obtained; the power frequency line voltage distribution curve is based on a prepared straight line, is less affected by a line structure, is obtained based on fault mechanism analysis, and has higher positioning credibility.

Description

technical field [0001] The invention relates to the technical field of distribution network fault detection, in particular to a method for locating and measuring a distance of a phase-to-phase short-circuit fault section of a distribution network using distribution characteristics of line voltages. Background technique [0002] In distribution network faults, phase-to-phase short-circuit faults have a greater impact on system stability and line insulation due to large fault currents and harsh fault conditions. Phase-to-phase short-circuit faults are often removed quickly to reduce their impact on the system. After the fault is removed, it is necessary to find the location of the fault point in time and repair it, so as to restore the power supply as soon as possible and reduce the power outage time. The phase-to-phase short-circuit fault location technology of distribution network is the key to improve the speed of fault point search, reduce operation and maintenance time, ...

AI Technical Summary

Problems solved by technology

The realization of the artificial intelligence method requires a large amount of historical data, and it is not universal for different lines, so it is difficult to popularize and apply; because the artificial intelligence method is separated from the fault principle analysis, there are random deviations in the ranging results, which reduces the reliability of the ranging ; At present, the artificial intelligence method mainly stays at the level of theoretical research, and there are few practical application reports

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