±800kV特高压换流站单极闭锁故障分析
Analysis of Single-pole Locking Faults in Ultra-High Voltage Converter Stations
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摘要: 针对某±800kV 特高压换流站极Ⅰ出现的单极闭锁故障,通过事件记录、故障原理剖析、波形检测等手段,确定故障原因为直流线路瞬时扰动导致直流滤波器首端电流互感器两套测量值异常,及直流线路 CT 三套电流测量值均存在异常,光CT在快速瞬变大电流工况下的测量失准为核心诱因。本文详细阐述了故障发生过程、保护动作原理及异常检测结果,初步分析了光CT测量异常的原因,并提出针对性的整改建议,为特高压换流站安全运行提供参考。
(须遵循?IMRaD?结构(背景/目的、方法、结果、结论),独立成文,不依赖正文即可完整传达研究核心信息。要求200字内)Abstract: for the single-pole locking fault that occurred at pole I of a ±800kV ultra-high voltage converter station, through event recording, fault principle analysis, waveform detection and other means, it was determined that the cause of the fault was that the instantaneous disturbance of the DC line led to abnormal measurement values of the two sets of current transformers at the beginning of the DC filter, and the three sets of current measurement values of the DC line CT were all abnormal. The measurement inaccuracy of photoCT under the condition of rapid transient high current is the core cause. This article elaborates in detail on the process of fault occurrence, the principle of protection action and the results of abnormal detection, preliminarily analyzes the causes of abnormal photoCT measurement, and puts forward targeted rectification suggestions, providing a reference for the safe operation of ultra-high voltage converter stations.(与中文对应)
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