Difference frequency anti-interference local discharge online monitoring device
A partial discharge and monitoring device technology, applied in the direction of testing dielectric strength, etc., can solve the problems of high fault false alarm rate and omission rate, inability to monitor, inaccurate data, etc., to improve the quality of repair and maintenance, and to achieve accurate monitoring data. Reliable and effective in suppressing interfering signals
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[0015] see figure 2 , image 3 , the signal collected by the partial discharge sensor includes partial discharge signal and interference signal, the frequency range is 10kHz-5MHz, and the signal is controlled by the interference suppression circuit ( image 3 ) of the middle VIN terminal input, after being filtered by a multi-stage high-frequency band-pass circuit composed of inductors L1~L6 and capacitors C1~C6 (filter frequency band 10kHz-5MHz), the signal is transmitted to the high-frequency amplifier F1 (model is AD603), The weak signal is initially amplified (magnified by 100 times), and then the signal is transmitted to the first frequency difference device CP1, where the frequency difference is performed with the local oscillator signal from the first-stage variable frequency local oscillator BZ1, and the first-stage local oscillator The frequency range is 10.7MHz-15.7MHz, and then the signal is transmitted to the first intermediate frequency filter amplifier circuit ...
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