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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Published in | IEEE transactions on power delivery pp. 1 - 11 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
IEEE
26.07.2024
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0885-8977 1937-4208 |
DOI: | 10.1109/TPWRD.2024.3433468 |