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GB/T 24838-20181100kV high-voltage alternating-current circuit-breakers (English PDF)

1100kV高压交流断路器

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

September 17, 2018

Implementation date

April 1, 2019

Scope

GB/T 24838-2018 is the English-translated version of 1100kV高压交流断路器.

GB/T 24838-2018 is the Chinese national standard for 1 100 kV high-voltage alternating-current circuit-breakers, used together with GB/T 11022-2011 and following its clause numbering.

It sets the service conditions, the ratings (insulation level, rated current, short-circuit breaking and making current, transient recovery voltage, out-of-phase and capacitive switching, operating sequence, mechanical and electrical endurance, noise), design rules for SF6 tightness, creepage distance and low-pressure lockout, and the type and routine tests, including seismic, near-zone fault and capacitive-current tests.

It covers indoor and outdoor circuit-breakers for 50 Hz systems of 1 000 kV nominal voltage together with their operating mechanisms, but excludes bypass circuit-breakers across line series capacitors.

It replaces GB/Z 24838-2009, was issued on 17 September 2018 and has applied since 1 April 2019.

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Document preview — GB/T 24838-2018

National Standard of the People's Republic of China

ICS: 29.240.10
Classification: K 43

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

Foreword
1 Overview
2 normal and special conditions of use
3 Terms and Definitions
4 rating
4.1 Overview
4.2 Rated voltage (Ur)
4.3 rated insulation level
4.4 Rated frequency (fr)
4.5 Rated current (Ir) and temperature rise
4.6 Rated short-time withstand current (Ik)
4.7 Rated peak withstand current (Ip)
4.8 Rated short circuit duration (tk)
4.9 Rated power supply voltage (Ua) for the opening and closing devices and auxiliary and control circuits
4.10 rated power frequency of the closing, opening and auxiliary circuits
4.11 Rated filling level of gas or liquid for insulation, operation and/or breaking
4.101 rated short-circuit breaking current (Isc)
4.102 Transient recovery voltage associated with rated short-circuit breaking current
4.103 rated short circuit closing current
4.104 Rated operation sequence
4.105 Near-zone fault characteristics
4.106 rated out-of-step closing and breaking current
4.107 rated capacitive opening and closing current
4.108 Opening and closing the no-load transformer
4.109 Open combined reactor
4.110 rated time parameter
4.111 Number of mechanical stability operations
4.112 Electrical life of circuit breakers
4.113 points, closing resistors and auxiliary fractures
4.114 noise level
5 Design and Structure
5.1 Requirements for liquids in circuit breakers
5.2 Requirements for gases in circuit breakers
5.3 Circuit breaker grounding
5.4 Auxiliary and control equipment
5.5 Power closing
5.6 Energy storage closing
5.7 Manpower-free operation
5.8 Trip unit operation
5.9 Low pressure and high pressure locking device
5.10 Nameplate
5.11 Interlocking device
5.12 Position indication
5.13 Degree of protection of the enclosure
5.14 Creepage distance
5.15 Gas Seal
5.16 Liquid seal
5.17 Flammability
5.18 Electromagnetic Compatibility (EMC)
5.19 X-ray emission
5.20 Corrosion
5.101 General requirements for operation
5.102 Pressure Limits for Operating Fluids
5.103 Operating mechanism
5.104 Secondary Communication Protocol
5.105 Other requirements
6 type test
6.1 General
6.2 Insulation test and partial discharge measurement
6.3 Radio interference voltage (riv) test
6.4 Measurement of main loop resistance
6.5 Temperature rise test
6.6 Short-time withstand current and peak withstand current test
6.7 Inspection of the degree of protection
6.8 Sealing test
6.9 Electromagnetic Compatibility (EMC) Test
6.10 Additional tests for auxiliary and control loops
6.101 Mechanical and Environmental Testing
6.102 Earthquake Resistance Test
6.103 Closure, breaking and opening and closing tests
6.104 Near-zone fault test
6.105 Out of step closure and breaking test
6.106 Additional breaking test for high TRV caused by line faults with series compensation devices
6.107 Capacitive current opening and closing test
6.108 Circuit breaker (E2 class) electrical life test
6.109 Split and closing resistance heat capacity test
6.110 Opening and closing reactor test
7 Factory test
7.1 Insulation test and partial discharge measurement of the main circuit
7.2 Test of auxiliary and control loops
7.3 Measurement of main loop resistance
7.4 Sealing test
7.5 Design and visual inspection
7.101 Mechanical operation and mechanical properties test
7.102 SF6 gas humidity measurement
8 Selection guidelines for circuit breaker operation
8.101 Overview
8.102 Selection of rated values under operating conditions
8.103 Selection of rated values under fault conditions
8.104 Choice of electrical life
8.105 Selection of charging current opening and closing of no-load line
9 Information provided with inquiries, tenders and orders
9.101 Information provided with the enquiry and order
9.102 Information provided with the tender
10 Transportation, storage, installation, operation and maintenance rules
10.1 Conditions of transport, storage and installation
10.2 Installation
10.3 Field test
10.4 Running
10.5 Maintenance
11 Security
12 Product impact on the environment
Appendix A (Normative) Calculation of transient recovery voltage for near-field faults based on rated characteristics
Appendix B (normative appendix) Tolerance of test parameters in type test

Foreword

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

This standard replaces GB /Z 24838-2009 "1100kV high voltage AC circuit breaker technical specifications", and GB /Z 24838-2009 phase The main differences are as follows.

--- Added terms and definitions such as "general terminology, switchgear, components of circuit breakers, operation, characteristic parameters" (see section 3) chapter);

--- Added a number of necessary diagrams (see Figures 1 to 26);

--- Added "Representation of Transient Recovery Voltage Waveform (TRV)" and revised the article number (see 4.102);

--- Increased the high TRV value and additional breaking test requirements for line faults considering the use of series compensation devices (see 6.106);

--- Modified the representation of the ability to open and combine reactors, from capacity to current value (see 4.109, GB /Z 24838-5.20 of 2009);

--- Revised the relevant requirements for terminal static load test (see 6.101.4.2, 7.12.4 of GB /Z 24838-2009);

--- Increased the type of test for opening and closing reactors (see 6.110);

--- Revised the factory test power frequency withstand voltage duration, increased from 1min to 5min, and previously carried out 635kV old Practice test for 5min (see 7.1, 9.1 of GB /Z 24838-2009);

--- Increased the total number of combined operations in the factory test should not be less than 200 times, and the last 20 times of the last 100 times and the last 100 times The last 20 times are the requirements of 10 reclosing operations (see 7.101);

---Modified the requirements for the insulation test of the main circuit of the circuit breaker in the tank circuit breaker or GIS in the "Handover Inspection and Test Procedure" (See 10.2.102.3.1, 12.2.2.3.1 of GB /Z 24838-2009);

--- Revised the clause number of the "Field Test" (see 10.3, Chapter 8 of GB /Z 24838-2009);

--- Added "product environmental impact" (see Chapter 12);

--- Added "calculation of transient recovery voltage for near-field faults based on rated characteristics" (see Appendix A);

--- Added "Tolerance of test parameters in type tests" (see Appendix B).

This standard should be used together with GB/T 11022-2011, unless otherwise specified in the standard, this standard refers to GB/T 11022-2011.

In order to simplify the expression of the same requirements, the chapter number of this standard is the same as GB/T 11022-2011. For supplement under the same reference heading The new terms are numbered starting from 101.

1 Overview

1.1 Scope

This standard specifies the conditions of use, rating, design and structure, test, selection guidelines, transportation, and 1100kV high voltage AC circuit breakers. Requirements for storage, installation, operation and maintenance.

This standard is applicable to UHV power designed to be installed outdoors or indoors and operated at a frequency of 50 Hz and a nominal voltage of 1000 kV. High voltage AC circuit breaker in the system.

This standard also applies to the operating mechanism of the 1100kV circuit breaker and its auxiliary equipment.

Circuit breakers with predetermined inter-pole different durations are not included in the scope of this standard except for single-pole auto-reclosing circuit breakers.

A bypass circuit breaker in parallel with the line series capacitor and its protective equipment is not included in the scope of this standard.

1.2 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 1984-2014 high voltage AC circuit breaker

GB/T 2900.20-2016 Electrotechnical term high voltage switchgear

GB/T 4473-2008 Synthesis test of high voltage AC circuit breaker

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

GB/T 12022-2014 industrial sulfur hexafluoride

GB/T 13540-2009 Seismic requirements for high voltage switchgear and control equipment

GB/T 29489-2013 Inductive load opening and closing of high voltage AC switchgear and control equipment

2 Normal and special conditions of use

2.1 Overview

of GB/T 11022-2011 applies.

2.2 Normal use conditions

of GB/T 11022-2011 is applicable and supplemented as follows.

a) ambient air temperature is up to 40 ° C, and the average temperature measured within 24 h does not exceed 35 ° C;

The ambient air temperature is at least -10 ° C, -25 ° C, -30 ° C, -40 ° C. b) Altitude. 1000m.

c) The effects of solar radiation should be considered. The solar radiation intensity is based on 1000 W/m².

d) Nominal creepage ratio.

1) The ground-to-ground creepage ratio of the Class III pollution area shall not be less than 25mm/kV;

2) The ground-to-ground creepage ratio of the Class IV contaminated area shall not be less than 31mm/kV.

The actual creepage ratio is the above-mentioned nominal creepage ratio value multiplied by the applied coefficient a, a value is shown in Table 1.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 89 pages — is available in the English PDF.

Referenced standards

Normative references

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