NEMA ICS 61800-4-2004 可调速电力驱动装置系统.第2部分:一般要求.高于1,000 V交流电且不超过25,000 V的交流电力驱动系统的额定规格
Adjustable Speed Electrical Power Drive Systems Part 4: General RequirementsRating Specifications for a.c. Power Drive Systems above 1000 V a.c. and Not Exceeding 35 kV (National Adoption)