Abstract
Several 10 kV arresters in transformer substations have experienced failures and explosions in service. In this paper, 5 failed and out-of-service arresters were taken as the research objects and then the aging characteristics and failure cause were analyzed by measuring the electrical characteristic parameters of the complete arresters. Firstly, upon appearance inspection of the arresters, rust, surface pollution, and surface flashover were found. Secondly, the electrical characteristic parameters of each arrester were measured in the experiment, and it was found that there was polarity effect in the forward and reverse DC reference voltages of the arresters. Based on the phenomenon of side flashover of #3, #4, and #5 arresters, it is further confirmed that #3, #4, and #5 arresters frequently experience impulse during actual operation, and it is proposed that the polarity of applied DC voltage should be considered in preventive testing of arresters, as well as the problem of residual voltage exceeding the standard while the DC reference voltage of #1 and #2 arresters meets the standard. Therefore, the aging status of arresters should be evaluated by multiple parameters. Finally, FFT analysis was conducted on the leakage current resistive component current waveforms of the arresters under the AC reference voltage u1 mA. It was found that the positive and negative peaks of leakage current resistive component current waveform of the arresters with polarity effect of DC reference voltage are asymmetric, and the amplitude of even-order harmonics has increased. Combined with the phenomenon that lightning in nature is mostly negative polarity, it indicates that the arresters frequently bear the impulse current of negative polarity during operation, which accelerates the aging of the arrester. In addition, it is proposed that even-order harmonic characteristics can also be used as a new approach for online monitoring of aging status indicators of arresters.
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Acknowledgment
This work is supported by Science and Technology Project of China Southern Power Grid Company Limited (Analysis on the Explosion Mechanism of 10 kV Arrester in Meizhou Power Supply Bureau and Research on New Detection Criteria, No.031400KK52220003 (GDKJXM20220662)).
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**, Y. et al. (2024). Analysis on Aging Characteristics and Failure Cause of 10 kV Out-of-service Arresters. In: Yang, Q., Li, Z., Luo, A. (eds) The Proceedings of the 18th Annual Conference of China Electrotechnical Society. ACCES 2023. Lecture Notes in Electrical Engineering, vol 1165. Springer, Singapore. https://doi.org/10.1007/978-981-97-1351-6_72
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DOI: https://doi.org/10.1007/978-981-97-1351-6_72
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