电容器组反时限过电压保护的实现

Implementation of the Inverse Time Overvoltage Protection of Capacitor Bank

在电容器组发生过电压的情况下,传统的定时限过电压保护在固定时限内断开电容器组,这使得电容器组的设备裕度得不到充分的利用。文中借助相关标准中的数据,通过曲线拟合的方法得到过电压保护的反时限特性方程。基于该方程在微机保护装置中实现了电容器组的反时限过电压保护,在实际工程应用中取得了较好的效果。

When overvoltage situation appears in capacitor bank,the traditional definite time overvoltage protection will cut off the capacitor bank in an appointed time delay,which makes the equipment margin of capacitor bank not be fully utilized.This paper gets the inverse time characteristic equation of overvoltage protection by curve fitting on the basis of the data from relevant standards.The inverse time overvoltage protection of capacitor bank is realized in a microprocessor-based protection device according to this characteristic equation,and it has achieved better results in practical application.