Development of Tester of the Resistive Leakage Current of MOA

Based on harmonics analysis, a technique of the resistive leakage current of the surge arrester is presented in this paper. From an electrical field transducer installed at the grounding line of surge arrester of the phase B, the phase angle information of the operation voltage can be gathered; from the current transducer around the grounding line of surge arrester, the general current signal is able to be gathered. By harmonics analysis and mathematic operation, the resistive leakage current of the surge arrester under the operation voltage can be calculated. Based on the technique presented in this paper, the tester of the resistive leakage current of the ZnO surge arrester is developed based on DSP TMSC320LF2407. By use of the strong operation performance of DSP, the software algorithm uses the digital filter processing, FFT and correlation processing. The test result shows accuracy of the detector.