GB/T 24845-2018Specification of metal–oxide surge arresters without gaps for 1000kV a.c. system (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB /Z 24845-2009 "Technical Specification for Non-Gap Metal Oxide Arresters for 1000kV AC Systems".

Compared with GB /Z 24845-2009, the main technical changes of this standard except for editorial changes are as follows.

--- Increased the relevant parameters of the rated voltage 804kV, 780kV arrester (see 7.1);

---External insulation withstand test, residual pressure test, action load test, power frequency voltage withstand time characteristic test, short circuit current test, seismic test Tests, bending load tests, etc. have been modified according to the latest edition of the IEC and recent research results (see Chapter 9, GB /Z 24845- Chapter 10 of 2009);

--- Increased voltage equalization capacitance test, environmental test and creepage distance check (see Chapter 9);

--- Increased abnormal operating conditions of the arrester (see Appendix A);

--- Revised the calculation formula in the voltage distribution test (see Appendix B, Appendix A of GB /Z 24845-2009);

--- Added special requirements for porcelain sleeve arresters for 1000kV AC systems used as post insulators (see Appendix C);

--- Added technical requirements for monitors for gapless metal oxide surge arresters in 1000kV AC systems (see Appendix D).

1 Scope

This standard specifies the operating conditions, technical requirements, inspection rules, and tests for gapless metal oxide surge arresters for 1000kV AC systems. Inspection methods and packaging and transportation.

This standard is applicable to porcelain bushings without gap metal oxide arresters designed for limiting the overvoltage of 1000kV AC systems. It is called "arrest arrester" and gas-insulated metal-enclosed gapless metal oxide surge arrester (referred to as "GIS arrester").

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 191 storage and transportation icon

GB/T 7354 partial discharge measurement

GB/T 7674 gas insulated metal-enclosed switchgear with rated voltage of 72.5kV and above

GB/T 8905 SF6 electrical equipment in gas management and testing guidelines

GB/T 11022-2011 Common technical requirements for high voltage switchgear and control equipment standards

GB/T 11023 high voltage switchgear sulphur hexafluoride gas seal test guide

GB/T 11032-2010 AC gapless metal oxide arrester

GB/T 12022 industrial sulfur hexafluoride

GB/T 13540-1992 Seismic requirements for high voltage switchgear and control equipment

GB/T 16927.1 High Voltage Test Technique Part 1. General Definitions and Test Requirements

GB/T 26218.1 Selection and sizing of high-voltage insulators for use under filth conditions Part 1. Definitions, information and general in principle

GB/T 26218.2 Selection and sizing of high-voltage insulators for use in filth conditions - Part 2. Porcelain and glass for AC systems Glass insulator

GB 50150 Electrical installation engineering electrical equipment handover test standard

GB 50260-2013 Code for seismic design of power facilities

JB/T 10492 metal oxide arrester monitoring device

IEC 60099-4:2014 AC gap-free metal oxide surge arrester (Metal-oxidesurgearresterswithoutgapsfor Acsystems)

3 Terms and definitions

The following terms and definitions as defined in GB/T 11032-2010 and GB/T 11022-2011 apply to this document. For convenience Use, some of the terms and definitions in GB/T 11032-2010 and GB/T 11022-2011 are repeated below.