GB/T 7253-2005 in English

《GB/T 7253-2005标称电压高于1000V的架空线路绝缘子 交流系统用瓷或玻璃绝缘子元件 盘形悬式绝缘子元件的特性》由TC80（全国绝缘子标准化技术委员会）归口，主管部门为中国电器工业协会。
本标准适用于标称电压高于1 000V、频率不大于100Hz的交流架空线路用瓷或玻璃盘形悬式绝缘子串件。本标准也适用于变电站使用的类似结构的绝缘子。本标准既适用于球窝连接也适用于槽形连接的盘形悬式绝缘子串件。本标准适用于清洁地区和污秽地区的架空线路绝缘子串件。对用于污秽水平很严重的地区和其他特殊的或极端环境条件下，改变某些尺寸可能是需要的。绝缘子件可选择不同的爬电距离、结构高度和形状(例如开放形、半球形等)。对用于直流系统的绝缘子可能也需选择不同的尺寸。在任何情况下，推荐采用本标准规定的标准化的机械特性和连接尺寸。本标准规定了盘形悬式绝缘子串件的机械特性和主要尺寸的特征值。本标准未规定绝缘子串件的工频、雷电冲击和击穿耐受电压值。GB/T 1001.1-2003规定了绝缘子串件的电气特性，其值应该由供需双方商定。

Scope

This standard applies to porcelain or glass disc-shaped suspension insulator string components for AC overhead lines with a nominal voltage higher than 1000V and a frequency not higher than 100Hz. This standard also applies to insulators of similar construction used in substations. This standard applies to both ball-and-socket connections and slot-connected disk-type suspension insulator string elements. This standard applies to overhead line insulator string elements in clean and polluted areas. For areas with severe pollution levels and other special or extreme environmental conditions, it may be necessary to change some dimensions. Insulator elements are available in different creepage distances, construction heights and shapes (e.g. open, hemispherical, etc.). Different sizes may also be required for insulators used in DC systems. In any case, standardized mechanical characteristics and connection dimensions specified in this standard are recommended. This standard specifies the mechanical properties and characteristic values of the main dimensions of disc insulator elements. This standard does not specify the power frequency, lightning impulse and breakdown withstand voltage values of insulator string components. GB/T 1001.1-2003 stipulates the electrical characteristics of insulator string components, and its value should be agreed upon by both parties. GB/T4056-1994 includes ball and socket connections and groove connections.