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中文摘要：
基波电压作用下产生的基波阻性电流ir1和3次阻性电流ir3可以很好地反映MOA工作状态。传统容性电流补偿算法及其改进算法没有考虑谐波电压作用,从理论上产生一定误差。为解决此问题,文中在改进的容性电流算法基础上,提出新的等效电阻修正算法,消除一部分谐波对阻性电流的影响,从而提高基波阻性电流和3次阻性电流的精度。MALTAB仿真分析,显示文中算法有效降低了基波阻性电流及3次阻性电流的误差,其中3次阻性电流减少了近一半,说明修正算法有效消除了谐波对阻性电流影响,提高了MOA预判的准确性。
英文摘要：
Abstract： The fundamental harmonic resistive current i,1 and the third harmonic resistive current i,3 generated by the fandamental voltage can reflect the operation state of metal oxide arrester （MOA）. The traditional MOA capacitive current compensation algorithm and its improved algorithm didn＇t take the harmonic voltage into consideration, so it will produce errors in theory. In order to resolve the problem, and on the basis of traditional algorithm, the new equivalent resistance algorithm is proposed in this paper so that a part influence of harmonic voltage on the resistive current is eliminated and the precision of it1 and ia is improved. The results simulated by MATLAB show that the error of irl and ir3 can be reduced. Especially that the ir3 is reduced by half, and the effectiveness of the modified algorithm is verified, the accuracy of MOA fault diagnosis is improved.
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