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GB/T 4787.1-2021Grading capacitors for high-voltage alternating current circuit-breakers - Part 1: General (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

May 21, 2021

Implementation date

December 1, 2021

Scope

GB/T 4787.1-2021 (Grading capacitors for high-voltage alternating current circuit-breakers - Part 1: General) is available as an English-translated PDF.

GB/T 4787.1-2021 is the Chinese standard "Grading capacitors for high-voltage alternating current circuit-breakers - Part 1: General". Its scope clause reads: This document specifies the use conditions, ratings, design and structure, testing, transportation, storage, and safety of voltage equalizing capacitors for high-voltage AC circuit breakers.

Installation, operation and maintenance rules, safety, and environmental aspects. This document applies to voltage equalizing capacitors connected in parallel with the breaker of the circuit breaker.

Its function is to improve the two extinguishing chamber units of the multi-fracture circuit breaker. Terminal voltage distribution. The equalizing capacitor can also be used in parallel with the arc extinguishing chamber unit on the single-break circuit breaker to suppress the transient recovery voltage (TRV).

The equalizing capacitor is a component of the circuit breaker and should meet the technical requirements of the circuit breaker. This document is applicable to voltage equalizing capacitors that meet one or both of the following categories. ---Installed on the air insulated circuit breaker; ---Installed on a closed circuit breaker.

The tests on the above different types of voltage equalizing capacitors are different in some cases. The purpose of this document is. ---Uniform rules for specifying performance, testing and ratings; ---Specify specific safety rules; ---Provide installation and operation guidelines.

This document does not apply to phase-to-ground capacitors installed on circuit breakers to suppress transient recovery voltage.

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Document preview — GB/T 4787.1-2021

National Standard of the People's Republic of China

Classification: K 42

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations and symbols
5 Normal and special conditions of use
6 Rating
7 Design and structure
8 Type test
9 Routine test
10 Rules for transportation, storage, installation, operation and maintenance
11 Security
12 Environmental aspects
Appendix A (informative) Structural changes of this document compared with IEC 62146-1.2016
Appendix B (informative) Technical differences between this document and IEC 62146-1.2016 and their reasons
Appendix C (Informative) Corrosion. Information about the conditions of use and recommended test requirements
Appendix D (informative) Self-resonant frequency measurement
Appendix E (informative) Summary of test items
References

1 Scope

This document specifies the use conditions, ratings, design and structure, testing, transportation, storage, and safety of voltage equalizing capacitors for high-voltage AC circuit breakers.

Installation, operation and maintenance rules, safety, and environmental aspects.

This document applies to voltage equalizing capacitors connected in parallel with the breaker of the circuit breaker. Its function is to improve the two extinguishing chamber units of the multi-fracture circuit breaker.

Terminal voltage distribution.

The equalizing capacitor can also be used in parallel with the arc extinguishing chamber unit on the single-break circuit breaker to suppress the transient recovery voltage (TRV).

The equalizing capacitor is a component of the circuit breaker and should meet the technical requirements of the circuit breaker.

This document is applicable to voltage equalizing capacitors that meet one or both of the following categories.

---Installed on the air insulated circuit breaker;

---Installed on a closed circuit breaker.

The tests on the above different types of voltage equalizing capacitors are different in some cases.

The purpose of this document is.

---Uniform rules for specifying performance, testing and ratings;

---Specify specific safety rules;

---Provide installation and operation guidelines.

This document does not apply to phase-to-ground capacitors installed on circuit breakers to suppress transient recovery voltage.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

GB/T 311.1 Insulation coordination Part 1.Definitions, principles and rules (GB/T 311.1-2012, IEC 60071-1.2006,

MOD)

GB/T 2423.23-2013 Environmental testing Part 2.Test method Test Q. Seal (IEC 60068-2-17.1994,

IDT)

GB/T 7354 High Voltage Test Technology Partial Discharge Measurement (GB/T 7354-2018, IEC 60270.2000, MOD)

GB/T 11022-2011 Common technical requirements for high-voltage switchgear and control equipment standards (IEC 62271-1.2007, MOD)

GB/T 13540 Seismic requirements for high-voltage switchgear and control equipment (GB/T 13540-2009, IEC 62271-2..2003,

MOD)

GB/T 16927.1 High Voltage Test Technology Part 1.General Definition and Test Requirements (GB/T 16927.1-2011,

IEC 60060-1.2010, MOD)

GB/T 20877 Guidelines for the introduction of environmental factors in the standard of electrical and electronic products (GB/T 20877-2016, IEC Guide109.

2012, MOD)

GB/T 23752-2009 Pressure-bearing and non-pressure-bearing hollow porcelain and glass insulators for electrical equipment with a rated voltage higher than 1000V (IEC 62155.2003, MOD)

GB/T 3906 | GB/T 11024.4 | GB/T 11024.2 | GB/T 6115.3 | GB/T 6115.1 | […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 57 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 311.1 · GB/T 311.1-2012 · IEC 60071 · IEC 60068 · IEC 60270.2000 · IEC 62271 · IEC 60060 · IEC 62155.2003

Cited by

GB/T 42009-2022High voltage alternating-current circuit-breakers for filter banks

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