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The metallic return arrester (EM arrester) is a crucial device in high voltage direct-current (HVDC) systems, tasked with suppressing overvoltage originated from mode conversion operations. Given the vast energy absorption requirement, EM arresters adopt a multi-column parallel structure. The disproportionately high dynamic load on single column resulting from current imbalance is critical in arrester design. This study establishes a transient computational model for EM surge arresters installed in a typical ± 800kV HVDC system. On this basis, the uneven current division due to deviation of voltage-ampere characteristics of single and multiple columns is investigated. The findings reveal larger energy absorption in columns exhibiting volt-ampere characteristics lower than the average. Interestingly, even when the aggregate unevenness coefficient complies with constraints of less than 1.1, a single column’s energy may double the average. Moreover, the range of multi-column voltage division coefficients positively correlates with maximum energy absorption, marking it a figure-of-merit elucidating the transient consistency among multi-columns in EM arresters. This research bears significant implications for the evaluation and design of surge arrester performance.

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Study on Multicolumn Current Imbalance on Energy Absorption of EM Arrester in ± 800kV HVDC System

  • 会议论文

  • 发表日期：

    2025年

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  • Wei Li,
  • Tao Liang,
  • Ziqian Yin,
  • Yaru Mu,
  • Sen Wang,
  • Yanhua Han,
  • Mingxi Zhu,
  • Jie Guo,
  • Yan-zhao Xie

摘要

The metallic return arrester (EM arrester) is a crucial device in high voltage direct-current (HVDC) systems, tasked with suppressing overvoltage originated from mode conversion operations. Given the vast energy absorption requirement, EM arresters adopt a multi-column parallel structure. The disproportionately high dynamic load on single column resulting from current imbalance is critical in arrester design. This study establishes a transient computational model for EM surge arresters installed in a typical ± 800kV HVDC system. On this basis, the uneven current division due to deviation of voltage-ampere characteristics of single and multiple columns is investigated. The findings reveal larger energy absorption in columns exhibiting volt-ampere characteristics lower than the average. Interestingly, even when the aggregate unevenness coefficient complies with constraints of less than 1.1, a single column’s energy may double the average. Moreover, the range of multi-column voltage division coefficients positively correlates with maximum energy absorption, marking it a figure-of-merit elucidating the transient consistency among multi-columns in EM arresters. This research bears significant implications for the evaluation and design of surge arrester performance.