GB/T 7253-2005 (English Version) PDF

Standard No.: GB/T 7253-2005
Language: Chinese, Available in English version
Release Date: 2005
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Status: Be replaced 2020-07
Replace By: GB/T 7253-2019
Latest: GB/T 7253-2019
Replace: GB/T 7253-1987

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.

GB/T 7253-2005 Referenced Document

GB/T 1001.1-2003 Insulators for overhead lines with a nominal voltage above 1000V Part 1: Ceramic or glass insulator units for a.c.systems--Definitions,test methods and acceptance criteria
GB/T 4056-1994 Coupling dimensions of suspension insulators for high voltage lines
JB/T 5895-1991 Guide rules for use of insulators in polluted areas

2019 GB/T 7253-2019 Insulators for overhead lines with a nominal voltage above 1 000V—Ceramic or glass insulator units for a.c.systems—Characteristics of insulator units of the cap and pin type
2005 GB/T 7253-2005 Insulators for overhead lines with a nominal voltage above 1000V--Ceramic or glass insulator units for a.c.systems.Charateristics of insulator units of the cap and pin type
1987 GB/T 7253-1987 The string insulator units of the cap and pin type--Dimensions and characteristics