变电站35kV电容器组保护的改造问题

The Reformation of 35 kV Substation Capacitor Banks Protection

在集合式电容器开口三角电压保护和相电压差动保护的理论基础上,针对系统内某变电站35 kV电容器组保护的设置情况,通过计算发生单相内部故障时两种保护方式的动作值,分析两种保护方式的可靠性,提出了提高电容器保护可靠性的改造方案。该方案在不改变保护灵敏度的情况下可以很大程度上提高电容器组保护的可靠性。

Based on the theories of open-delta voltage protection and phase voltage differential protection, the reliabilities of the two types of protection methods are analyzed by calculating the operating values when fault occurs on the 35 kV capacitor of a substation. Reformation program is put forward to improve the reliability of capacitor protection. The program can largely improve the reliability of the capacitor protection when the sensitivity does not change.