本标准包括半导体功率整流器、逆变器、，专用额定负载的熔炉和可调速驱动器-单相100 kW及以上-三相100 kW及以上本标准范围不包括-静电除尘器-直流输电用高压变流器-非变流器基频功率含量超过10%的混合负载-其他非线性负载

This standard includes transformers for semiconductor power rectifiers, inverters, furnaces and adjustable speed drives for dedicated loads rated - Single-phase 100 kW and above - Three-phase 100 kW and above The scope of this standard excludes - Static precipitators - High-voltage converters for dc power transmission -Mixed loads of more than 10% non-converter fundamental frequency power content - Other nonlinear loads