Optimization Design Method for Filter Circuit of High-frequency Partial Discharge Signal in Substation Equipment
In the design of high-frequency partial discharge monitoring systems for substation equipment,the difficulty of sig-nal processing circuit design lies in the parasitic parameters of inductors and capacitors in the filter circuit under high frequency conditions,which leads to the actual performance of the circuit cannot reach the expectation.This paper proposed an optimization design method for passive filter circuits based on the LC device measured characteristics.A 7-order Chebyshev bandpass filter emulation design that was consistent with the measured characteristics was presented by optimizing and fitting the measured char-acteristics of components from various manufacturers,and the signals with frequency of 3～30 MHz that met the requirements of high-frequency partial discharge signal specifications can be extracted from the original wide-band signals with frequency up to 100 MHz.The experimental results show that the difference between the emulated and measured amplitude frequency characteris-tics of the optimized filter circuit throughout the passband is lower than 0.4 dB,the measured attenuation of the filter circuit throughout the passband is lower than 1.7 dB,and the differences between circuit passband characteristics caused by individual differences in the same model of components are lower than 0.3 dB.
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