UHF partial discharge active noise tracking suppression measurement system and its working method

Abstract

The invention relates to an ultrahigh-frequency partial discharge active noise tracking and suppression measurement system and a working method thereof, in particular, an acquisition system of partial discharge ultrahigh-frequency signals and a working method of the acquisition system. At present, partial discharge ultrahigh-frequency signal acquisition cannot both have monitoring sensitivity and anti-interference ability. According to the technical scheme of the invention, the ultrahigh-frequency partial discharge active noise tracking and suppression measurement system includes a probe, a radio frequency power splitter of which the input end is connected with the output end of the probe, a detection circuit and a frequency mixing circuit of which the input ends are connected with the output ends of the radio frequency power splitter, an analog-to-digital conversion circuit of which the input ends are connected with the output ends of the detection circuit and the frequency mixing circuit, a processor connected with the analog-to-digital conversion circuit, and an input and output device which is connected with the processor, wherein the analog-to-digital conversion circuit is provided with a dual-path AD sampling chip so as to perform analog-to-digital conversion on the signals of the wave detection circuit and the frequency mixing circuit. According to the ultrahigh-frequency partial discharge active noise tracking and suppression measurement system provided by the technical schemes of the invention, broadband detection monitoring and narrowband mixed frequency monitoring are combined together; a local oscillator and a frequency mixer are adopted to actively track interference signals and suppress the interference signals, and therefore, a contradiction between sensitivity and anti-interference ability can be alleviated.

Description

technical field [0001] The invention relates to a partial discharge UHF signal acquisition system and its working method, in particular to a UHF partial discharge active noise tracking and suppression measurement system and its working method. Background technique [0002] At present, there are two methods of known partial discharge UHF signal collection, 1: what is represented by the KEMA laboratory in the Netherlands is UHF narrow-band monitoring, although it can effectively avoid UHF radio and mobile signal interference, However, the measurement bandwidth is narrow, the loss of discharge information is serious, and because it only monitors a very narrow part of the partial discharge signal, it is not as sensitive as broadband monitoring in the case of low noise. 2: Strathclyde University uses UHF broadband monitoring to collect discharge signals in the entire UHF band. Although the amount of information is rich and can be used in the field, it cannot be removed for random...

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Problems solved by technology

[0002] At present, there are two methods of known partial discharge UHF signal collection, 1: what is represented by the KEMA laboratory in the Netherlands is UHF narrow-band monitoring, although it can effectively avoid UHF radio and mobile signal interference, However, the measurement bandwidth is narrow, the loss of discharge information is serious, and because it only monitors a very narrow part of the partial discharge signal, it is not as sensitive as broadband monitoring in occasions with low noise

2: Strathclyde University uses UHF broadband monitoring to collect discharge signals in the entire UHF band. Although the amount of information is rich and can be used in the field, it cannot be removed for random UHF radio and mobile signal interference, which is easy to cause signal distortion

Broadband monitoring has high sensitivity, but weak anti-interference ability; narrowband monitoring can flexibly avoid various interferences, but has low monitoring sensitivity

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