Performance Assessment of Closing Resistor for 800 kV Filter Circuit Breaker Under Electro-thermo-mechanical Multi-field Coupling

NIU Bo; CAI Xu; MA Feiyue; ZHAO Jingyu; SUN Shangpeng; NI Hui; LIU Tao; DENG Junbo

doi:10.13296/j.1001-1609.hva.2026.02.005

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Performance Assessment of Closing Resistor for 800 kV Filter Circuit Breaker Under Electro-thermo-mechanical Multi-field Coupling

Research & Analysis | 更新时间：2026-03-16

- Performance Assessment of Closing Resistor for 800 kV Filter Circuit Breaker Under Electro-thermo-mechanical Multi-field Coupling
- High Voltage Apparatus Vol. 62, Issue 2, Pages: 33-41(2026)
- 作者机构：
  
  国网宁夏电力有限公司电力科学研究院，银川 750011
  西安交通大学电力设备电气绝缘国家重点实验室，西安 710049
  国网宁夏电力有限公司，银川 750001
  西安西电开关电气有限公司，西安 710077
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.02.005
  CLC：
- Received：17 July 2025，
  
  Revised：2025-10-11，
  
  Published：16 February 2026
- 稿件说明：
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NIU Bo, CAI Xu, MA Feiyue, et al. Performance Assessment of Closing Resistor for 800 kV Filter Circuit Breaker Under Electro-thermo-mechanical Multi-field Coupling[J]. High Voltage Apparatus, 2026, 62(2): 33-41.
DOI：

NIU Bo, CAI Xu, MA Feiyue, et al. Performance Assessment of Closing Resistor for 800 kV Filter Circuit Breaker Under Electro-thermo-mechanical Multi-field Coupling[J]. High Voltage Apparatus, 2026, 62(2): 33-41. DOI： 10.13296/j.1001-1609.hva.2026.02.005.

摘要

合闸电阻对于抑制滤波器组断路器过电压及合闸涌流具有重要作用，但随着电压等级的提升，800 kV滤波器断路器内部合闸电阻的故障率显著升高。目前对于合闸电阻工作环境多场耦合仿真还不够充分，相应改进措施也未得到验证。该研究针对合闸电阻在滤波器断路器中的可能出现的各种合闸电阻故障产生的原因进行了仿真分析，提出了相应的改进方案，并对改进后的效果进行了仿真验证。结果表明，合闸电阻在正常状态下，电场分布均匀，运行稳定；但在异常工况下，局部温度迅速升高，可能导致热应力集中并影响其性能。常见的故障问题包括电阻表面附着金属异物、电阻片同轴度差以及端面接触不良等。为此，提出了几项优化措施：通过在电阻片之间增加铝片改善接触面接触不良；在端部电阻片添加铝块以减少端面应力集中；通过增加绝缘支撑柱外表面直径和合闸电阻堆外护套提升电阻片的同轴度，从而减少电场畸变和提高整体保护性。仿真结果显示，这些优化措施显著提升了合闸电阻的性能，减小了温升和热应力，提高了其安全性和可靠性，对于合闸电阻优化设计仿真分析具有重要意义。

Abstract

The closing resistor plays an important role in suppressing the overvoltage and closing inrush current of filter bank circuit breakers. However

with the increase in voltage

the failure rate of the closing resistor in 800 kV filter circuit breakers significantly rises.Currently

multi-field coupling simulations for the working environment of the closing resistor are insufficient

and corresponding improvement measures have not been verified. In this paper various possible failure causes of closing resistor in filter circuit breakers are simulated and analyzed. The corresponding improvement solutions are proposed and the improvement effectiveness is verified by simulation. The results show that under normal conditions the closing resitor is normal in electric field distribution and stable in operation. However

in case of abnormal conditions

local temperatures rise rapidly

potentially leading to concentrated thermal stress and affecting its performance. The common faults include the attachment of metal foreign objects to the surface of the resistor

wek coaxiality of the resistor disc and weak contact at the end faces. To address these issues

several optimization measures are proposed

namely

adding aluminum sheets between resistor disc to improve weak contact at the contact surfaces;adding aluminum blocks to the end resistor blocks to reduce stress concentration at the ends;and increasing the external surface diameter of insulation support and the outer sheath of the closing resistor stack to enhance the coaxiality of the resistor disc

thereby reducing electric field distortion and improving overall protection. Simulation results show that these optimization measures significantly enhance the performance of the closing resistor

reduce temperature rise and thermal stress and improve its safety and reliability

which are of significant importance for the simulation analysis and optimization design of closing resistor.

关键词

Keywords

references

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