500 kV在运主变压器抗短路电流能力不足的治理方案

Treatment Plan for Insufficient Anti-Short Circuit Ability of 500 kV Transformer in Operation

针对500 kV长寿变电站主变抗短路电流能力不足的问题,分析主变抗短路电流能力提升的不同方法。分析限流电抗器阻抗值确定的原则,结合站内电气布置,采用在主变低压侧汇流前加装干式限流电抗器,结合低压侧连接导体绝缘化的处理方案。仿真计算表明加装限流电抗器后,低压侧电压波动不影响站内设备运行,无功补偿容量小幅偏差的影响可控。结果表明:该方案为一种经济而可靠的主变抗短路能力不足治理方案。

Aimed at the problem of the transformer in 500 kV Changshou substation,different methods of improving anti-short circuit ability is analyzed.The principle of determining the impedance of the current-limiting reactor is analyzed.According to the layout of the substation,installation of dry current-limiting reactor before confluence on the low-voltage side of the transformer,combined with insulation of the connecting conductor is adopted.The simulation calculation shows after installation the current-limiting reactor,voltage fluctuation on the low-voltage side do not affect the equipment operation;the influence of slight deviation of the reactive power compensation is controllable.The results show it is an economical and reliable solution for insufficient anti-short circuit ability of the main transformer.