DIN EN 60433-1999 1kV以上公称电压的架空电线用绝缘子.交流电系统用瓷绝缘子.长棒型绝缘子串的特性值
Insulators for overhead lines with a nominal voltage above 1 kV - Ceramic insulators for a.c. systems - Characteristics of insulator units of the long rod type (IEC 60433:1998); German version EN 60433:1998