探究高压厂变低压侧零序过流保护的优化配置

The Research of Zero Sequence Over Current Protection Setting for High Pressure Transformer Low Side with Small Resistance

《DL/T1502-2016厂用电继电保护整定计算导则》中,说明了高压厂用变压器低压侧中性点经小电阻接地的保护整定方案存在不合理性。基于此,根据燃气电厂的接线方式和负荷分配,优化高压厂变低压侧零序过流保护的配置。

In DL/T1502-2016 Guidelines for Setting and Calculating Relay Protection for Subsidiary Power Plants,it is shown that the setting scheme of low-voltage transformer neutral point grounded by small resistance is unreasonable. Based on this,according to the wiring mode and load distribution of gas power plant,the configuration of zero sequence over-current protection on low-voltage side of high-voltage transformer is optimized.