Branch line short circuit fault positioning method based on time domain inversion

Abstract

The invention provides a branch line short circuit fault positioning method based on time domain inversion, and the method comprises the steps: selecting an end point of a circuit network, and measuring a transient signal f(t) generated by a fault; performing time domain inversion operation on the transient signal f(t), and injecting the transient signal f(t) into the circuit network; splitting lines with branches in the circuit network into one-dimensional lines, arranging a short-circuit branch along each one-dimensional line to serve as a guess fault point, wherein short-circuit current energy is a function with the fault position of the guess fault point as a variable; and solving the optimization problem of the maximum value of the short circuit current energy so as to position a fault point. The fault positioning method provided by the invention is suitable for any complex network with branches, the position of a short-circuit branch does not need to be exhausted in the positioning process, the physical background is clear, the calculation speed is higher, and the precision is higher.

Description

technical field [0001] The invention belongs to the field of electric power, in particular to a branch line short-circuit fault location method based on time-domain inversion. Background technique [0002] The bare conductors of the existing overhead transmission lines are exposed to the air for a long time. When encountering severe weather conditions such as low temperature, rain and snow, the transmission line may be covered with ice or lightning strikes, wet flashover of insulators, pollution flashover, etc., which may cause line damage. Fault. To ensure the safe operation of the transmission line, it is necessary to quickly locate the location of the line fault, so as to shorten the power outage time as much as possible, and avoid further expansion of the impact and loss caused by the fault. [0003] At present, the common short-circuit fault location methods of transmission lines mainly include impedance method, traveling wave method, artificial intelligence algorithm ...

AI Technical Summary

Problems solved by technology

In the current research process, when calculating the energy of the short-circuit current, it is necessary to exhaustively set up different short-circuit branches along the transmission line and perform multiple simulations, especially for distribution networks with complex structures and many branches. Large room for improvement

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