主变加装小电抗限制220kV侧短路电流的应用分析

Research and Analysis of 220kV Power Grid on the Side of Short-circuit Current Restrictions

对500kV变电站220kV母线单相短路电流普遍超标主要原因、限制短路电流措施、小电抗阻值的选择、小电抗对继电保护的影响、小电抗电气主接线方案等进行了分析;为提高500kV主变供电可靠率和主变的利用率,适应东莞电网220kV电网的发展要求,提出相应的解决方案。

Through analysis of the main reasons of universal exceeding of 500kV substation 220kV bus single-phase short-circuit current, the measure to limit short-circuit current, the choice of small electrical resistance, the impact of small reactance on the relay protection, the program of small reactance main electrical wiring, the paper tries to raise the corresponding solutions to improve the reliability of electricity supply 500kV main transformer in the utilization rate and the main transformer to adapt to the development of Dongguan Grid 220kV power grid.