Fault analysis and pretreatment method based on transient and wave recording type fault indicator

Abstract

The invention discloses a fault analysis and pretreatment method based on a transient and wave recording type fault indicator. The method comprises steps of: obtaining a wave recording file of the transient and wave recording type fault indicator; performing phase analysis on the first 3 power frequency periods of a wave recording waveform W1, while performing inverse phase process on the wave recording waveform, which does not meet the phase requirement, and re-forming a wave recording waveform W2; calculating values of phase difference, namely Pha, Phb, and Phc, between the three-phase voltage and the current of A, B, and C in W2; judging whether the sizes of Pha, Phb, and Phc belong to the [0 degree, 25 degrees] interval. if so, turning to step 4; and if not, inverting the current waveform, which does not meet the phase requirement, synchronously updating the wave recording waveform W2, and judging whether the sizes of Pha, Phb, Phc belong to the [0 degree, 25 degrees] interval again; if so, turning to step 4; recalculating and updating a zero-sequence current of the updated wave recording waveform W2, based on the three-phase current in the updated wave recording waveform W2.

Description

technical field [0001] The invention relates to a fault analysis and preprocessing method based on a transient wave recording type fault indicator, which belongs to the technical field of electric power system distribution automation. Background technique [0002] Transient wave recording type fault indicator is installed on the distribution line, used to monitor the field strength and current of the line, and record the wave at the time of the fault. Distribution automation selectively receives the wave recording files of fault indicators, and performs fault analysis on the wave recording files under the same substation, providing decision support for power grid operation and maintenance personnel. [0003] The fault indicator of transient state recording type is composed of three acquisition units and one collection unit. The three acquisition units are respectively installed on the A, B, and C three-phase lines. Through wireless communication, the collection unit communi...

AI Technical Summary

Problems solved by technology

The installation direction of the acquisition unit is reversed, which will cause the recording to be reversed and affect the normal analysis

[0004] The existing fault analysis technology based on the fault indicator of transient recording type directly analyzes the waveform of the received fault indicator without pre-judging or pre-processing the correctness of the waveform direction, which affects the accuracy and reliability of the analysis

Therefore, how to preprocess the recorded waveform of the fault indicator and avoid the waveform disorder caused by the on-site construction personnel installing the fault indicator acquisition unit in reverse phase is of great significance to improve the application and operation and maintenance management level of the distribution automation system

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