Short circuit fault location method of branch line based on time domain inversion

Abstract

The branch line short-circuit fault location method based on time domain inversion provided by the present invention includes the steps of: selecting an end point of the circuit network, and measuring the transient signal generated by the fault f(t) ; for the transient signal f(t) Inject the circuit network after performing time domain inversion operation; split the branched lines in the circuit network into one-dimensional lines, and set short-circuit branches along each one-dimensional line as guessing fault points, and the short-circuit current energy The method is a function that takes the fault position of the guessed fault point as a variable; and solves an optimization problem of the maximum value of the short-circuit current energy to locate the fault point. The fault location method provided by the invention is applicable to any complex network with branches, the location process does not need to exhaustively enumerate the positions of short-circuit branches, the physical background is clear, and the calculation speed is faster and the accuracy 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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