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南水北调中线工程为特大型长距离调水工程,具有负荷点多、线路长、要求供电可靠性高等特点,其35kV供电专网采取架空为主、电缆为辅的方式。由于供电专网中电缆的大量使用以及经常性长距离轻载,使得整个供电网络呈容性。文章分析了电容电流的危害,对三种高压无功补偿装置进行了比较和选择,对今后长距离输电线路的高压无功补偿装置选择具有一定的参考价值。
The Middle Route of South-to-North Water Diversion Project is a large-scale long-distance water diversion project with features such as more load points, longer lines and higher reliability of power supply. The 35kV power supply network adopts overhead and cable supplemented. Due to the heavy use of cables in the power supply network and frequent long-distance light loads, the entire power supply network is capacitive. The paper analyzes the harm of capacitor current, compares and selects three kinds of high voltage reactive power compensation devices, and has certain reference value for the choice of high voltage reactive power compensation device for long distance transmission lines in the future.