选煤厂660V供电系统的接地保护技术研究

摘要

The features of 660 V three-phase three-line power distribution systems are neutral grounding system. The applied method of grounding resistance value choice is discussed. One is the calculation method about current of single-phase ground capacitance when the neutral metal grounded; and the other setting method is about the system leakage （zero sequence current） protector. These two methods are introduced, which provide reference for on-site protection setting technology.%分析了660V三相三线制配电系统为中性点经高电阻接地系统的特性，阐述了接地电阻器阻值选取的实用方法，中性点金属接地时单相接地电容电流的计算方法及此系统漏电（零序电流）保护器的整定方法，为现场的保护整定技术提供参考依据。