Analysis of Influence of Oscillatory Overvoltage on Insulation Performance of Bipolar Neutral Line Filter Reactors
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 5, Pages: 74-84(2025)
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DOI：10.14044/j.1674-1757.pcrpc.2025.05.008
CLC：Received：27 April 2025，
Published：25 October 2025
- 稿件说明：
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ZHANG Hongwei. Analysis of Influence of Oscillatory Overvoltage on Insulation Performance of Bipolar Neutral Line Filter Reactors[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 74-84.
ZHANG Hongwei. Analysis of Influence of Oscillatory Overvoltage on Insulation Performance of Bipolar Neutral Line Filter Reactors[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 74-84. DOI： 10.14044/j.1674-1757.pcrpc.2025.05.008.
摘要
超高压直流线路发生雷击时，会引起线路电压和电流陡增，产生的过电压将对中性区域设备及其绝缘造成严重影响。文章分析了某±500kV换流站雷击直流线路引起中性母线产生振荡过电压的故障现象和发展过程，通过解体检查、耐压试验、理论计算和仿真模拟研究了故障机理，验证了振荡过电压对中性电抗器各项技术参数选取、设备选型的影响，并提出针对性防范措施，对做好中性区域直流设备特别是电抗器设计选型、运行维护等环节工作具有重要的借鉴和参考意义。
Abstract
Lightning strike of extra-high voltage direct current lines can cause a sudden increase of both voltage and current on the line，and the resulting overvoltage will have a serious impact on neutral area equipment and its insulation. In this paper，the fault phenomenon and development process of neutral bus oscillatory overvoltage caused by lightning strikes on DC lines at a ± 500kV converter station is analyzed. The fault mechanism is studied through disassembly of equipment and inspection，voltage withstand test， theoretical calculation and simulation. The impact of oscillatory overvoltage on the selection of technical parameters and type selection of neutral reactors is verified，and targeted preventive measures are proposed， which have important reference and guidance significance for the design，selection，operation，and maintenance of DC equipment in neutral areas，with reactors in particular.
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