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Abstract

The present invention relates to a monitoring method and system of arrester applied to smart substation. The monitoring method of arrester applied to smart substation includes following steps: 1) getting original sample value of the arrester leakage current, 2) getting resample values of the original sample values of leakage current and SV voltage signals, 3) getting the amplitude and the phase values of the resample values of the leakage current and the SV voltage signals by Fourier transforming, 4) calculating angles between the resample values of the leakage current and the SV voltage signals according to the phase values of the resample values of the leakage current and the SV voltage signals, and calculating value of resistive current with the method of fundamental wave projection, 5) getting value of resistive current after medium filtered by medium filtering the value of resistive current, making a comparison of the value of resistive current after medium filtered and setting threshold value, and forewarning timely when the value of resistive current after medium filtered exceeds the setting threshold value. The monitoring system of arrester applied to smart substation comprises collecting unit, data processing unit and merge unit. The present invention, that the monitoring method of arrester applied to smart substation, could reduce the influence of the electronic interference on the system and raise the monitor accuracy of the faults of the arrester.

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First Claim