Signal receiving conditioner of UHF partial discharge detecting system

Abstract

The invention provides a signal receiving conditioner of a UHF partial discharge detecting system, comprising a broadband amplification module, a broadband detection output module, an intelligent switch module and a frequency-selecting conditioning-outputting module, wherein the broadband amplification module is used for performing band-pass filtering and signal amplification on received radio-frequency signals so as to obtain broadband amplification signals; the broadband detection output module is used for outputting the broadband amplification signals; the intelligent switch module outputs the broadband amplification signals to the frequency-selecting conditioning-outputting module when being used in a specific interference environment; and the frequency-selecting conditioning-outputting module is used for mixing the broadband amplification signals and preset local oscillator signals, filtering intermediate-frequency signals obtained by mixing according to the frequency spectrum of partial discharge radiation signals, and extracting the partial discharge radiation signals from the intermediate-frequency signals. The signal receiving conditioner of the UHF partial discharge detecting system provided by the invention combines the broadband amplification detection technology and the mixing technology, extracts the partial discharge radiation signals from the radio-frequency signals in a detection field, and filters interference signals so as to enable the system to reach the optimum detection sensitivity and provide a hardware basis with complex anti-interference capability for the detection system.

Description

technical field [0001] The invention relates to a signal receiving conditioner of a UHF partial discharge detection system. Background technique [0002] Partial discharge refers to the discharge that occurs locally in the insulating part of the power equipment under the action of a sufficiently strong electric field. Every partial discharge will have some influence on the dielectric strength of the insulating medium. Slight partial discharge has little effect on the insulation of power equipment, and the dielectric strength will drop slowly; while strong partial discharge will make the dielectric strength drop quickly. This is an important factor that damages the insulation of high-voltage power equipment. Therefore, when designing the insulation of high-voltage power equipment, it is necessary to consider that under the action of long-term working voltage, strong partial discharges are not allowed to occur in the insulation structure. The monitoring of the equipment in o...

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Problems solved by technology

[0008] In order to solve the problem of low anti-interference ability of the signal receiving conditioner of the UHF partial discharge detection system in the prior art, the present invention provides a signal receiving conditioner of the UHF partial discharge detection system with high anti-interference ability

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