Abstract:

In order to solve the problem that the insulation fault of the cable joint is difficult to detect,the partial discharge on-line detection system for the cable joint based on the high-frequency current method is designed.The DSP and FPGA are taken as the core to collect the partial discharge signal coupled with high frequency current transformer (HFCT) installed on the ground wire of the cable connector through FPGA.The DSP is used to compile FFT and wavelet transform programs to suppress the white noise and narrow-band interference of the partial discharge signals,which can achieve on-line detection of partial discharge signals.Finally,the oscilloscope signal and MATLAB noise reduction processing results are compared with the on-line detection system.The comparison results are consistance,which can prove the effectiveness of this system.

Key words: cable joint, high-frequency current method, partial discharge, FPGA, DSP