Direct current partial discharge source detecting and recognizing device

Abstract

The invention discloses a direct current partial discharge source detecting and recognizing device. The direct current partial discharge source detecting and recognizing device comprises a band-pass filter, a high speed capture card and an industrial personal computer, is capable of realizing direct current partial discharge source detection, classification and mode recognition, and is applicable to transformer paper oil insulation partial discharge experiment. An analog front end of the device is provided with 40M simulation bandwidth, so that high-frequency component of partial discharge pulse signal is guaranteed to be correctly acquired; resolution of high-speed capture card is 10 bits, so that resolution and sensibility of the device during partial discharge pulse collection. The device is capable of recording partial discharge pulse waveform and happening moments to form pauls time sequence, adopting partial discharge pulse cluster rapid classifying technology to classify original pulse cluster into a plurality of auxiliary pulse clutter to abstract discharge fingerprint according to pulse waveform characteristics and at last utilizing fault characteristics data base to perform discharge type judgment on the auxiliary pulse clutter. The direct current partial discharge source detecting and recognizing device has typical characteristics functions such as external disturbance eliminating function, multiple partial discharge source separating function and partial discharge mode recognition function.

Description

technical field [0001] The invention belongs to the technical field of partial discharge monitoring of high-voltage equipment. Specifically, it is a DC partial discharge source detection device and identification device. Background technique [0002] The power transformer is one of the important electrical equipment in the power system. Once an accident occurs, it will take a long time to repair and cause serious impact. With the rapid development of my country's electric power industry and the continuous expansion of the power grid, the stand-alone capacity and installed capacity of power transformers continue to increase, and the voltage level is also continuously improved. Generally speaking, the larger the capacity and the higher the voltage level, the greater the loss caused by transformer failure. In recent years, although the reliability of power transformers has been improved due to the improvement of materials, design methods and manufacturing technologies, unexpe...

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Problems solved by technology

[0003] The detection of DC partial discharge is an important means of monitoring the state of oil-paper insulation of power transformers. At present, there are few partial discharge detection device systems under DC. In China, only the research group of Professor Wu Guangning of Southwest Jiaotong University has developed a traditional narrow-band DC partial Discharge detector (bandwidth less than 2MHz), China Academy of Engineering Physics has also developed a similar DC partial discharge discharge detection analyzer for pulse capacitors

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