GB/T 21421.1-2021 Active National standards

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

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

Publish Date: 2021-12-31 Implement Date: 2022-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 21421.1-2021

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Insulator

ICS Name: Insulator

Publish Date: 2021-12-31

Implement Date: 2022-07-01

Pages: 13 pages

Scope

This document specifies the standard values for the mechanical characteristics of composite insulator string elements and the main dimensions used in the connection of composite insulator string elements, so that the insulators and end fittings provided by different manufacturers can be assembled and interchanged.
This document also specifies the standard connection symbol representation method for composite insulator string elements.
Note 1: The general provisions and methods of testing are described in the relevant product standards.
Note 2: This document only deals with the dimensions necessary for connection assembly, and does not specify material performance and working load. Table 1 shows the dimensional match between end fittings and strength grades.

Development Information

Word Count: 27 Thousand words Pages: 13 pages

Replace the following standards

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

Referenced Standards

GB/T 2900.8-2009 Electrotechnical terminology—Insulators GB/T 4056-2019 Dimensions of ball and socket couplings of string insulator units GB/T 19519-2014 Insulators for overhead lines—Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1 000 V—Definitions,test methods and acceptance criteria GB/T 22079-2019 HV polymeric insulators for indoor and outdoor use—General definitions,test methods and acceptance criteria GB/T 25317-2010 Dimensions of clevis and tongue couplings of string insulator units

Adopt standards

IEC 61466-1:2016

Related Standards

GB/T 4585.1-1984 Abolished

GB/T 4585.1-1984 Artificial pollution tests on high-voltage insulators to be used on a.c.systems Salt-fog method

Publish Date: 1984-07-23

GB/T 775.1-1987 Replaced

GB/T 775.1-1987 Test method for insulators—Part 1:General test methods

Publish Date: 1987-01-23

GB/T 775.3-1987 Replaced

GB/T 775.3-1987 Test method for insulators—Part 3:Mechanical test methods

Publish Date: 1987-01-23

GB/T 7253-1987 Replaced

GB/T 7253-1987 The string insulator units of the cap and pin type—Dimensions and characteristics

Publish Date: 1987-02-09

GB 12744-1991 Replaced

GB 12744-1991 Outdoor antipollution-type solid-core post insulators of ceramic material

Publish Date: 1991-03-21

GB/T 4585.2-1991 Abolished

GB/T 4585.2-1991 Artificial pollution tests on high-voltage insulators to be used on a.c.systems solid-layer method

Publish Date: 1991-06-06