Development of monitoring system based UHF PD sensor
                                                                   MA Chao1, LIN Lin1, HUANG Jian fang2
(1.Skills Training Center, State Grid Jibei Electric Power Company Limited, Baoding 071000, China;2.Zhejiang Machinery Industry Federation, Hangzhou 310009, China)

Abstract: In order to improve the local high frequency on line monitoring effect of the partial discharge signal of the power transformer, the special high frequency acquisition antenna, the amplification circuit, the detection circuit and the acquisition system software were designed and manufactured. The HFSS software was used to optimize the antenna of the UHF sensor, which can realize the effective collection of the UHF band of the partial discharge of the transformer. In order to improve the sensitivity and anti jamming capability of signal detection, AltiumDesigner software was used to design the separation and amplification circuit of UHF sensor and make circuit module. In order to form a complete UHF on line monitoring sensor, the antenna was combined with the signal processing module. Acquisition program was compiled by the labview software, which can achieve signal acquisition, threshold settings and alarm, historical data viewing and export functions. The method of combining the UHF signal acquisition device and the acquisition program were studied, which based on labview compilation detection to form a complete UHF PD system. The results indicate that the monitoring system can complete the function of antenna acquisition, signal amplification, detection and input acquisition system.

Key words: partial discharge; UHF; sensors; on line monitoring system