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<p>The circuit breaker for a 750&#xa0;kV alternating current filter (ACF) field is different from the line circuit breaker. It must be switched frequently due to changes in operation mode and daily load. In addition, it is subjected to mixed alternating current (AC) and direct current (DC) voltages, which leads to more frequent pre-insertion resistor faults. In this paper, pre-insertion resistor specimens were collected from a worksite, and the ability of the pre-insertion resistors to resist impact loads was assessed using a falling weighing impact test. When the impact energy applied to the pre-insertion resistors exceeded 7.5&#xa0;J and the transient impact force reached 90 kN, the pre-insertion resistors cracked and broke. The simulation results showed that under impact load, an increase in the flatness tolerance of the pre-insertion resistors produces significant stress concentration. The stress exceeds the maximum allowable value, which causes breakage at the outer edges. The defective outer edge breakage distorts the circumferential field strength of the resistor stack and increases the maximum field strength by 30% compared to an undamaged resistor stack. Finally, this paper verifies the effectiveness of adding a pure aluminum transition plate at the resistor stack support seat to reduce resistor sheet breakage through a falling weight impact test and simulation analysis.</p>

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Analyzing the impact fracture mechanisms of 750 kV pre-insertion resistors based on a falling weight impact test

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Hongliang Zhang,
  • Tianhao Yao,
  • Hao Wang,
  • Yanyan Bao,
  • Yifan Li,
  • Hai Jing,
  • Chuang Wang

摘要

The circuit breaker for a 750 kV alternating current filter (ACF) field is different from the line circuit breaker. It must be switched frequently due to changes in operation mode and daily load. In addition, it is subjected to mixed alternating current (AC) and direct current (DC) voltages, which leads to more frequent pre-insertion resistor faults. In this paper, pre-insertion resistor specimens were collected from a worksite, and the ability of the pre-insertion resistors to resist impact loads was assessed using a falling weighing impact test. When the impact energy applied to the pre-insertion resistors exceeded 7.5 J and the transient impact force reached 90 kN, the pre-insertion resistors cracked and broke. The simulation results showed that under impact load, an increase in the flatness tolerance of the pre-insertion resistors produces significant stress concentration. The stress exceeds the maximum allowable value, which causes breakage at the outer edges. The defective outer edge breakage distorts the circumferential field strength of the resistor stack and increases the maximum field strength by 30% compared to an undamaged resistor stack. Finally, this paper verifies the effectiveness of adding a pure aluminum transition plate at the resistor stack support seat to reduce resistor sheet breakage through a falling weight impact test and simulation analysis.