Phase windowing parameter adjustment method of diagnostic atlas based on partial discharge signal characteristics

Abstract

The invention discloses a diagnosis graph phase windowing parameter adjusting method based on partial discharge signal characteristics, and the method includes, firstly, acquiring a discharge pulse sequence of the partial discharge signal, and calculating the pulse width and the pulse interval of the discharge pulse sequence; adjusting the phase windowing parameters converted from the partial discharge signals into the diagnosis graph according to the pulse width and the pulse interval, containing all the discharge pulses in each phase window; and converting the partial discharge signals intoa diagnosis graph according to the phase windowing parameters. According to the method, the extraction precision of the partial discharge pulse information is improved, and the problems that when a current discharge pulse signal is converted into a diagnosis spectrum, the partial discharge pulse phase windowing number is not enough, the corresponding phase precision and the time precision are toolow, and the pulse signals are not distinguished to be lost, the signal key information is lost and the diagnosis result is affected are solved, and the diagnosis efficiency and accuracy are improved.

Description

technical field [0001] The invention belongs to the field of partial discharge detection, and in particular relates to a method for adjusting phase windowing parameters of diagnostic atlases based on the characteristics of partial discharge signals. Background technique [0002] Phase windowing number: the phase windowing number is required when converting the partial discharge pulse time domain signal into the partial discharge pulse sequence phase distribution (Phase Resolved Pulse Sequence, PRPS) or partial discharge phase distribution (Phase Resolved Partial Discharge, PRPD) spectrum processing. It is generally believed that the frequency of the power grid, that is, the power frequency is 50Hz, and a power frequency cycle is 20 milliseconds. All alternating currents are sine waves, so a sine wave with a frequency of 50Hz can be regarded as a power frequency cycle. At the same time, the starting point of the sine wave is set at 0°, and the end point is 360°, which is con...

AI Technical Summary

Problems solved by technology

At present, the number of phase windows is fixed in the application, and each manufacturer is different. They have not started from the characteristics of the partial discharge pulse time domain signal to study the pulse width and pulse interval of the partial discharge pulse time domain signal of different fault sources. The differences in the above have different requirements for the number of phase windows. When the partial discharge pulse is converted into a diagnostic map, the number of phase windows is insufficient, the phase accuracy and the corresponding time accuracy are too low, resulting in the loss of the pulse signal. The lack of key information affects the results of diagnostic analysis