Abstract
Aiming at a fault on service duty test of vacuum on-load tap changer (OLTC), the principle of the resonance test method is analyzed. Combined with the voltage and current waveform measured and the standard switching sequence, the cause and process of the test fault are qualitatively deduced. Based on the theoretical analysis, the simulation model of the test circuit and fault is built based on PSCAD. The voltage and current waveforms obtained by simulation are highly consistent with the test waveforms. The error of peak current between the simulation and the test waveform is 0.75%. The simulation results show the accuracy of the theoretical analysis and modeling calculation, they are verified by the follow-up inspection results of OLTC and vacuum tube solution. This paper provides a powerful technical means for fault analysis and fault mechanism research in the follow-up OLTC operation. It also has reference and guiding significance for the quality control, design, operation and maintenance, and monitoring of vacuum OLTC.
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