GB/T 21421.1-2008
Composite string insulator units for overhead lines with a nominal voltage greater than 1000V.Part 1:Standard strength classes and end fittings (English Version)

Standard No.

GB/T 21421.1-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Status

Be replaced 2022-07

Replace By

GB/T 21421.1-2021

Latest

GB/T 21421.1-2021

Scope

This part applies to composite insulator string components for AC overhead lines with a nominal voltage higher than 1000V and a frequency not exceeding 100Hz. It is also suitable for the use of insulators of similar design in substations or on electric traction lines. The purpose of this standard is to specify the specified values of the mechanical properties of composite insulator string elements and the main dimensions used for connection on composite insulator string elements, so that insulators or end accessories provided by different manufacturers can be assembled and interchanged. This part also specifies the standard connection symbols for composite insulator string components.

GB/T 21421.1-2008 Referenced Document

• GB/T 19519-2004 Composite insulators for a.c.overhead lines with a nominal voltage greater than 1000V---Definitions,test methods and acceptance criteria
• GB/T 4056 Dimensions of ball and socket couplings of string insulator units*， 2019-12-10 Update
• IEC 60471:1977 Dimensions of clevis and tongue couplings of string insulator units

GB/T 21421.1-2008 history

• 2021 GB/T 21421.1-2021 Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V—Part 1：Standard strength classes and end fittings
• 2008 GB/T 21421.1-2008 Composite string insulator units for overhead lines with a nominal voltage greater than 1000V.Part 1:Standard strength classes and end fittings

GB/T 21421.1-2008 -All Parts