Study on Improving the Operating Lifespan of AC Filter Arresters in Converter Station Based on the Degradation Characteristics of ZnO Varistor under Unipolar and Bipolar Polarity Impulse Currents

The degradation of AC filter (ACF) arresters in converter stations can be accelerated by the frequent occurrence of unipolar polarity impulse currents during energization of ACFs. However, the present approaches for suppressing frequent unipolar polarity impulse currents are costly. In this paper, a...

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Bibliographic Details
Published inIEEE transactions on power delivery pp. 1 - 11
Main Authors Zhang, Jie, Han, Yongxia, Yu, Fei, Huang, Wentao, Li, Licheng, Luo, Xin, Meng, Yongchang, Sun, Quan
Format Journal Article
LanguageEnglish
Published IEEE 26.07.2024
Subjects
Arresters
DC reference voltage
Degradation
Degradation characteristics
Harmonic characteristics
II-VI semiconductor materials
Life estimation
Operation lifespan
Varistors
Voltage measurement
Zinc oxide
ZnO varistor
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Summary:The degradation of AC filter (ACF) arresters in converter stations can be accelerated by the frequent occurrence of unipolar polarity impulse currents during energization of ACFs. However, the present approaches for suppressing frequent unipolar polarity impulse currents are costly. In this paper, accelerated degradation tests with positive and bipolar polarity impulse currents are carried out on zinc oxide (ZnO) varistors to investigate the discrepancy in the degradation characteristics between these impulse currents, and the mechanism is briefly discussed. ZnO varistors have a slower degradation rate and better stability under bipolar polarity impulse currents. Moreover, the polarity and waveform features of the impulse current on ACF arresters during energization of ACFs are determined through PSCAD/EMTDC simulations. Combined with the monitored statistics, the test results and simulation results, a theoretically economical approach for improving the operating lifespan of ACF arresters in a converter station already in operation is proposed.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2024.3433468