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GB/T 39891-2021Electrical endurance testing for circuit-breakers above a rated voltage of 52 kV (English PDF)

52kV及以上断路器电气耐久性试验方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 9, 2021

Implementation date

October 1, 2021

Scope

GB/T 39891-2021 is the English-translated version of 52kV及以上断路器电气耐久性试验方法.

GB/T 39891-2021 fixes the electrical endurance testing of circuit-breakers rated above 52 kV.

It gives the general rules of the test, the test samples, the procedure of the electrical endurance test within the standard type tests, the procedure when the endurance test is combined with those tests, the no-load test, the wear test and the acceptance test.

It applies to class E2 SF6 circuit-breakers of 52 kV and above used on overhead lines. Switchgear makers, grid companies and test laboratories use it. Issued on 9 March 2021, it has applied since 1 October 2021.

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Document preview — GB/T 39891-2021

National Standard of the People's Republic of China

ICS: 19.020
Classification: K 40

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
4.1 Maintenance-free period of test samples
4.2 Factors to be considered when determining electrical durability test procedures
4.3 Composition of electrical durability test
4.4 Electrical durability test procedure category
4.5 Basic principles of electrical durability test procedures
5 Test sample
5.1 General
5.2 Test sample parameters and structure
5.3 Information about the test sample
5.4 Confirmation of consistency of test sample pattern and data
6 Electrical durability test procedure separate from standard type test
6.1 Test sequence and criteria
6.2 Test conditions for electrical endurance test separate from standard type test
7 Electrical durability test procedure combined with standard type test
7.1 General
7.2 The equivalent number of breaking operations
7.3 Combined test procedure
8 No-load test
8.1 General
8.2 Rated operating sequence
8.3 No-load operation test to verify the consistency of the test sample
8.4 No-load operation test before and after the electrical durability test
9 Wear test
9.1 General
9.2 Test procedures and requirements
10 Acceptance test
10.1 General
10.2 No-load operation test
10.3 T10 test
10.4 L75 test at 60% rated short-circuit breaking current
10.5 Line charging current switching test
10.6 Status check
Appendix A (Informative) The closing and breaking test methods of circuit breakers related to the electrical endurance test
A.1 Basic short-circuit test method
A.2 Near-zone fault test
A.3 Out-of-step closing and opening test (OP1 and OP2)
A.4 Line charging current switching test
Appendix B (informative) Example of electrical endurance test for circuit breakers separated from standard type tests
B.1 Test sample
B.2 Test procedure

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

Introduction

The extended electrical life of the circuit breaker defined in 3.4.113 of GB/T 1984-2014 (Class E2 circuit breaker), that is, the electrical durability of the circuit breaker The performance is derived from the operating experience of specific high-voltage circuit breakers and system protection and maintenance strategies. Moreover, for the newly developed circuit breaker, the electrical resistance Durability can only be verified by laboratory tests.

The new maintenance strategy tends to be "maintenance-free circuit breakers". For most users, reducing maintenance costs is the main problem, and Maintenance performance can be verified through laboratory tests.

In order to prevent different users from adopting different electrical durability test procedures, to ensure that the circuit breaker electrical It is necessary to propose a standardized test procedure for the consistency of the gas durability data.

1 Scope

This document specifies the general rules of electrical durability test for circuit breakers of 52kV and above, test samples, and standard type tests.

Electrical durability test procedures, electrical durability test procedures combined with standard type tests, no-load test, abrasion test and acceptance test.

This document is applicable to E2 class SF6 circuit breakers of 52kV and above for overhead lines.

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 1984-2014 high voltage AC circuit breaker

GB/T 2900.20-2016 Electrical terminology high-voltage switchgear and control equipment

GB/T 7674-2008 Gas-insulated metal-enclosed switchgear with rated voltage of 72.5kV and above

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

3 Terms and definitions

GB/T 1984-2014, GB/T 2900.20-2016, GB/T 11022-2011 and the following terms and definitions apply to this document.

3.1 Heavy breakdown restrike

After the arc is extinguished during the breaking operation of the switching device, within a quarter of the power frequency cycle or longer, there is no residual current between the contacts. The current reappears.

Note: All circuit breakers in operation have a certain degree of heavy breakdown probability. The level of the probability of heavy breakdown also depends on the operating conditions (e.g. insulation coordination, annual The number of operations, the user's maintenance plan, etc.).Therefore, in order to classify the heavy breakdown performance of the circuit breaker, two-level circuit breakers are introduced. C1 level and C2 level. [Source: GB/T 2900.20-2016, 9.43, with modification]

3.2 C1 circuit-breaker class C1

A circuit breaker that has a low probability of heavy breakdown during the capacitive current interruption process verified by a prescribed type test. [Source: GB/T 1984-2014, 3.4.114]

3.3 C2 circuit-breaker class C2

A circuit breaker that has a very low probability of heavy breakdown during the capacitive current interruption process verified by a prescribed type test. [Source: GB/T 1984-2014, 3.4.115]

3.4 E2 circuit-breaker class E2

A type of circuit breaker. During its expected service life, the parts used for breaking in the main circuit do not require maintenance, and only a few other parts are required. Maintenance (breakers with extended electrical life).

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.

Referenced standards

Normative references

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