Leakage Current Tester of MOA Based on Windows and Interpolated FFT

DU Yanxing,SHENG Zhongru,CHEN Jiming,LUO Yiping(Electrical Engineering College of Xi′an Jiaotong University,Xi′an 710049,China)  

A new model of leakage current tester of MOA(metal oxide arrester)is introduced.Based on the hardware of MCU and floating DSP,the software utilizes the windows and interpolated FFT algorithm,which can improve the measure precision of fundamental frequency component of resistive leakage current caused by unsynchronized sampling.It is proved by experiments that the tester is stable,of high precision and it also reveals well resistance against interference.What the tester gets can more preciously represent the working condition of MOA.

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