Method for identifying signal and interference signal in ultrahigh frequency partial discharge detection in electrical equipment

Abstract

A method for discriminating signals and interference during ultrahigh-frequency partial discharge detection of electrical equipment comprises the following steps of: a. carrying out ultrahigh-frequency signal acquisition near equipment to be detected using four sensors to obtain four paths of ultrahigh-frequency partial discharge signals; b. carrying out time-delay calculation using an adaptive time-delay calculation method based on the least mean square algorithm according to the acquired four paths of ultrahigh-frequency signals to obtain three time-delay values; c. substituting the three time-delay values obtained by calculation into a positioning equation system, and solving the equation system using a simulated annealing algorithm to calculate the position of a discharge source; and d. according to the positioning result of the discharge source, judging whether the detected signals come from the inside or the outside of the equipment, so as to discriminate the partial discharge signals and the interference signals. The present invention can achieve and improve the discrimination of discharge signals and interference signals during partial discharge detection of electrical equipment, and particularly can achieve discrimination of interference to the equipment to be detected by discharge signals of external equipment.

Description

technical field [0001] The invention relates to the technical field of insulation detection of electrical equipment, in particular to a method for identifying signals and interference in the detection of UHF partial discharge of electrical equipment. Background technique [0002] Partial discharge detection is an important means of monitoring the insulation state of power equipment. UHF detection technology has the advantages of high measurement frequency, frequency bandwidth, large amount of information, and strong anti-interference, so it has become a research hotspot. The substation belongs to a strong electromagnetic interference environment, and there are corona discharges, shocks caused by switching operations, and partial discharges in adjacent high-voltage electrical equipment. Since the strong interference signal enters the measurement system through various ways, the amplitude may still be very high even though it has been attenuated. Some interference signals have...

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Problems solved by technology

[0004] Aiming at the relatively low reliability and accuracy of interference signal recognition in the prior art for partial discharge detection of electrical equipment, especially for the discharge interference of other similar external equipment, the present invention provides a UHF partial discharge detection medium for electrical equipment. The identification method of signal and interference can solve the above problems from the perspective of interference source location

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