Distribution automation master station system single-phase earth fault location method based on transient state recording data

Abstract

The present invention discloses a distribution automation master station system single-phase earth fault location method based on transient state recording data. When single-phase earth fault starting criteria is satisfied, a master station system fault location program is started; a received fault recording file is subjected to analysis according to the recording file data format standard; the signal processing technology is employed to calculate and obtain fault characteristic quantities comprising three-phase current catastrophe characteristics before and after fault points, waveform correlation coefficients between each two three-phase catastrophe current and zero-sequence current intrinsic mode energy behind the fault points; the floating-point type fault characteristic quantities obtained through calculation are converted to integrated group numbers, and a group number with the most obvious characteristic quantity is converted to motion signals of a fault indicator; and the interphase short-circuit fault processing mechanism of the distribution automation master station system is employed to complete single-phase earth fault location. The method provided by the invention is not influenced by the system earth mode and the single-phase earth fault condition so as to allow a location effect to be ideal.

Description

technical field [0001] The invention relates to a method for locating a single-phase ground fault of a power distribution automation master station system based on transient wave recording data, and belongs to the technical field of single-phase ground fault positioning of a power distribution automation system. Background technique [0002] Single-phase ground fault is the most common fault in the small current grounding system of distribution network, accounting for more than 80%. After a single-phase ground fault occurs, the voltage of the fault relative to ground decreases, and the phase voltage of the non-fault phase increases, but the line voltage remains symmetrical. , and the fault current is small, so it does not affect the continuous power supply to users, and the system can continue to run for 1 to 2 hours. However, after the fault occurs, the voltage of the non-fault phase increases (the maximum can reach the times), if it runs with a fault for a long time, it c...

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Problems solved by technology

However, since the distribution network adopts a radial network with many branches and complex structure, it is difficult to accurately find the fault point even if the fault line is found.

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