Time domain reconstruction-based local discharging pulse counting method

Abstract

The invention discloses a time domain reconstruction-based local discharging pulse counting method. The method comprises the steps of synchronously acquiring transient earth voltage local discharging pulse signals in a multi-channel way through a data acquisition card by a transient earth voltage sensor; performing time domain reconstruction processing on the acquired transient earth voltage local discharging pulse signals according to a power frequency phase period to obtain a continuous time domain local discharging pulse signal waveform having counting characteristic; selecting windowing length with fixed time frame, performing signal extraction by synchronous time domain windowing, recording a pulse peak in each window, and taking an average value, wherein the acquired pulse peak is larger than a set local discharging detection threshold; and outputting average pulse amplitude and corresponding phase information, generating an average discharging quantity oscillograph, and performing calculation to obtain accumulated discharging quantity and discharging energy. The method is widely applied to distributed monitoring of local discharging of various types of power equipment, the noise influence can be effectively removed, the counting rule of local discharging monitoring is highlighted, and the monitoring accuracy is effectively improved.

Description

technical field [0001] The invention relates to the technical fields of power equipment state monitoring and partial discharge diagnosis, in particular to a statistical method for partial discharge pulses based on time domain reconstruction. Background technique [0002] Partial discharge is an electrical discharge in which the insulation between conductors is only partially bridged. It is the main cause of insulation degradation of power equipment. Through the detection of partial discharge signals, the evaluation of the degree of insulation degradation and service life of power equipment can be realized. Generally, during the manufacture and operation of insulating materials, bubbles, impurities and other substances will appear inside the insulating medium, which leads to areas of high field strength appearing inside or on the surface of the insulating medium. Once the field strength in these areas is high enough to cause the The local breakdown of the area will cause the ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a partial discharge pulse statistics method based on time domain reconstruction. This method overcomes the problems of the traditional partial discharge detection system and algorithm complexity, and can be widely used in the detection of partial discharge of various power equipment. Monitoring, effectively remove the influence of noise, highlight the statistical law of partial discharge monitoring, and effectively improve the accuracy of monitoring

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