变电站站用交流电源典型配置及剩余电流保护问题研究

Research on Typical Configuration and Residual Current Protection of Station AC Power Supply in Substation

变电站站用交流系统主要为变电站内的电力设备提供交流电源,其安全可靠对保证站内电力设备正常运行有重要意义。总结归纳了220 kV变电站站用交流电源系统供电范围,阐述了目前变电站站用交流电源系统典型接地方式及存在的问题,并就传统配置和一体化配置的站用交流电源系统的优缺点进行对比分析;结合现有标准规范对变电站站用交流电源系统剩余电流保护问题,分别就站用交流系统在单电源和双电源供电方式下低压断路器的安装型式展开研究,并提出具体建议。

The station AC power system used in substation mainly provides AC power for the power equipment.Its safety and reliability are of significance to ensure the normal operation of power equipment.It summarizes the power supply scope of a station AC power sys⁃tem in 220 kV substation.It expounds the grounding status and existing problems of the station AC power system at present,compares the advantages and disadvantages of the station AC power system with traditional configuration and integrated configuration.Combined with the existing standards and specifications,for the residual current protection problems of station AC power supply system in substa⁃tion,it researches and makes specific suggestions for installation type of low voltage circuit breaker in station AC system under single power supply and dual power supply in respectively.