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《High Voltage Engineering》 2005-01
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Frequency Band of Pulse Current Method for the Measurement of PD in Transformer

GUI Junfeng1, GAO Wensheng2, TAN Kexiong2, WU Zhensheng1 (1. School of Electrical Engineering, Beijing Jiaotong University, Beijing 10004 4, China; 2. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)  
During the detection of partial discharge (PD) in transformer, it is necessary to select a proper frequency bandwidth of measu rement for improving quality of the detection. A suggested frequency range of PD measure3ment is presented in this paper. At first, an imitating experiment with typical narrow PD is carried out in an actual transformer. The imitative curren t of PD pulse is input into the winding at different positions, and response at measuring-terminal is detected so that the PD signal can be gained. Then the en ergy region of PD in transformer is studied by analyzing the power spectral dens ity of the signal. It is found that the energy descends significantly over 10 MH z in frequency domain. It indicates that the energy of PD centralizes in the fre quency below 10 MHz. Finally, the effect of frequency bandwidth of measuring dev ice on the amplitude of PD signal is studied. The PD signal is processed by a se ries of low-pass digital filters, so that influence of different measuring devi ces on signal can be simulated. It shows that the amplitude of the processed sig nal has less relationship with the filter when its upper frequency is over 12 MH z. It is presented that the band width of PD measuring device can be 8 to 20 MHz .
【CateGory Index】: TM41
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【Co-citations】
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