DIN EN 61325-1996 额定电压1000V以上架空线绝缘子.直流系统陶瓷或玻璃绝缘子.定义、试验方法和验收准则
Insulators for overhead lines with a nominal voltage above 1000 V - Ceramic or glass insulator units for d.c. systems - Definitions, test methods and acceptance criteria (IEC 61325:1995); German version EN 61325:1995