Ultra high frequency partial discharge signal space positioning method based on time delay estimation
A partial discharge signal and time delay estimation technology, which is applied in the direction of testing dielectric strength, etc., can solve the problem of inaccurate positioning of partial discharge signals, and achieve the effect of improving positioning accuracy
Inactive Publication Date: 2015-08-19
STATE GRID CORP OF CHINA +1
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[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a method for space positioning of UHF partial discharge signals based on time delay estimation, and solve the technical problem of inaccurate positioning of partial discharge signals in the prior art
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[0035] Usually, the partial discharge signal in the insulation structure of the transformer can be regarded as being sent by a point source. When the partial discharge occurs in the insulating medium, the neutralization of positive and negative charges occurs, forming a discharge pulse with a duration of nanoseconds, and Radiate electromagnetic waves to the surroundings, following Maxwell's basic equations of electromagnetic fields. The electromagnetic wave generated by partial discharge propagates to the surrounding space, and flows along the propagation direction of the electromagnetic wave, which is a function of time and position. Considering that when the electromagnetic wave emitted by partial discharge propagates through the gap of the box or the GIS insulation gap, the electromagnetic wave in the high frequency band will be diffracted and propagated to the outside of the equipment, so the substation ultra-high frequency partial discharge based on time delay estimation i...
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The present invention discloses an ultra high frequency partial discharge signal space positioning method based on time delay estimation. The method comprises a signal collection and storage step of carrying out synchronous trigger acquisition of an ultra high frequency partial discharge signal received by an antenna array through a four-channel collection system, and transmitting the collected partial discharge signal to a host machine through data transmission to carry out storing and processing, a threshold setting step of setting a threshold according to a trigger level, a zero-crossing point determination of high-order interpolation step of taking the first zero-crossing point of a waveform which exceeds the threshold as the wave front time of the signal, and searching zero-crossing point time through a high-order interpolation method, a manual calibration step of using a mouse to point the approximate location of a wave front time zero-crossing point when a position error is large and automatically searching and calculating first zero-crossing point time, and a space positioning step of substituting the zero-crossing point time into a time delay equation to calculate the space position of the ultra high frequency partial discharge signal. The method has the advantages of small amount of calculation, the improvement of time delay estimation accuracy and the improvement of positioning accuracy.
Description
technical field [0001] The invention relates to a time delay estimation-based space positioning method for UHF partial discharge signals, belonging to the technical field of electric power detection. Background technique [0002] Partial Discharge (PD) signal can reflect the aging characteristics of transformer insulation, and its location is an effective means to detect defects in manufacturing and installation and avoid insulation breakdown failures. PD signal is a high-current narrow-pulse signal, which is rich in frequency components. Ultra-high frequency (UHF) electromagnetic waves have the advantages of strong anti-interference, high sensitivity, and stable propagation speed. The application of partial discharge location and fault diagnosis is one of the current research hotspots. [0003] At present, the partial discharge detection and location of substation equipment is mainly for specific single equipment such as gas insulated switchgear (GIS), transformer, capacit...
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IPC IPC(8): G01R31/12
Inventor 陈昱同王天正俞华晋涛高鹏
Owner STATE GRID CORP OF CHINA