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

Abstract

The invention discloses a method for identifying signals and the interference signals in ultrahigh frequency partial discharge detection in electrical equipment. The method comprises the following steps of: a. acquiring ultrahigh frequency signals near a device to be detected by using four sensors so as to obtain four paths of ultrahigh frequency partial discharge signals; b. carrying out the calculation of time delay by adopting a self-adaptive time delay calculation method based on a minimum mean square algorithm according to the obtained four paths of ultrahigh frequency signals, so as to obtain three time delay values; c. substituting the three time delay values obtained from the calculation into a positioning equation set, and solving the position of a discharge power supply by using a simulated annealing algorithm; and d. judging whether a detected signal comes from the interior or the exterior of the device according to a positioning result of the discharge power supply, so as to identify a partial discharge signal and an interference signal. By adoption of the method, the identification of the discharge signals and the interference signals in the partial discharge detection of the electrical equipment is realized and improved, and particularly the identifications to the discharge signals of periphery equipment and the interference of the equipment to be detected are realized.

Description

technical field [0001] The invention relates to the technical field of electrical equipment insulation detection, in particular to a method for identifying signals and interferences in electrical equipment UHF partial discharge detection. Background technique [0002] Partial discharge detection is an important means of monitoring the insulation status of power equipment. UHF detection technology has the advantages of high measurement frequency, wide 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, impacts caused by switching operations, and partial discharges inside adjacent high-voltage electrical equipment. Since strong interference signals enter the measurement system through various channels, the amplitude may still be high despite attenuation, and some interference signals have the same or simi...

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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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