GB/T 24837-20181100kV high-voltage alternating-current disconnectors and earthing switches (English PDF)

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

Contents

• Foreword
• 1 Overview
• 1.1 Scope
• 1.2 Normative references
• 2 normal and special conditions of use
• 2.1 Overview
• 2.2 Normal use conditions
• 2.3 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 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 supply voltage (Ua) for closing and opening devices and their auxiliary and control circuits
• 4.10 Rated power supply frequency for closing and opening devices and their auxiliary and control circuits
• 4.11 Pressure rating of compressed air supply for insulation and/or operation
• 4.12 Gas rated filling level for insulation and/or opening and closing
• 4.101 rated short circuit closing current
• 4.102 rated terminal mechanical load
• 4.103 Isolation switch busbar conversion current opening and closing capability rating
• 4.104 Grounding Switch Induction Current Opening and Closing Capability Rating
• 4.105 isolation switch bus charging current opening and closing capacity rating
• 4.106 Isolation switch and earthing switch mechanical life rating
• 4.107 Grounding Switch Electrical Life Rating
• 4.108 Isolation Switch Small Capacitance Current and Small Inductor Current Opening and Closing Capability Rating
• 5 Design and Structure
• 5.1 Requirements for liquid media in disconnectors and earthing switches
• 5.2 Requirements for gaseous media in isolating switches and earthing switches
• 5.3 Grounding of the isolating switch and grounding switch
• 5.4 Auxiliary and control equipment
• 5.5 Power Operation
• 5.6 Energy storage operation
• 5.7 Manpower-free operation
• 5.8 Trip unit operation
• 5.9 Low pressure and high pressure lockout and monitoring 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 and vacuum seals
• 5.16 Liquid seal
• 5.17 Fire hazard (flammability)
• 5.18 Electromagnetic Compatibility (EMC)
• 5.19 X-ray emission
• 5.20 Corrosion
• 5.101 Special requirements for grounding switches
• 5.102 Requirements for the disconnection of the isolating switch
• 5.103 Mechanical strength
• 5.104 Operation of the isolating switch and the grounding switch - the position of the moving contact system and its indication, signalling device
• 5.105 Maximum force allowed by human operation
• 5.106 Dimensional Tolerance
• 6 type test
• 6.1 General
• 6.2 Insulation test
• 6.3 Radio interference voltage (riv) test
• 6.4 Measurement of loop resistance
• 6.5 Temperature rise test
• 6.6 Test for short-time withstand current and peak withstand current
• 6.7 Protection level inspection
• 6.8 Sealing test
• 6.9 Electromagnetic Compatibility Test (EMC)
• 6.10 Additional tests for auxiliary and control loops
• 6.101 Grounding switch short circuit closing ability test
• 6.102 Operation and Mechanical Life Test
• 6.103 Operational test under severe freezing conditions
• 6.104 Operational test at extreme temperatures
• 6.105 Functional test of position indicating device
• 6.106 Busbar Conversion Current Opening and Closing Test
• 6.107 Induction current opening and closing test
• 6.108 Small capacitive current opening and closing test
• 6.109 Small inductive current opening and closing test
• 7 Factory test
• 7.1 Overview
• 7.2 Main circuit insulation test
• 7.3 Insulation test of auxiliary and control circuits
• 7.4 Measurement of main loop resistance
• 7.5 Sealing test
• 7.6 Design and visual inspection
• 7.101 Mechanical Operation Test
• 8 Selection guide for isolation switch and grounding switch
• 9 Information provided with enquiries, tenders and orders
• 10 Transportation, storage, installation, operation and maintenance rules
• 10.1 Overview
• 10.2 Conditions for transport, storage and installation
• 10.3 Installation
• 10.4 Run
• 10.5 Repair
• 11 Safety
• 11.1 Overview
• 11.2 Preventive measures at the manufacturer
• 11.3 User's precautions
• 11.4 Electrical aspects
• 11.5 Mechanical aspects
• 11.6 Hot aspects
• 11.7 Operational aspects
• 12 Product impact on the environment
• Appendix A (Normative) Design and testing of position indicating devices
• Appendix B (normative appendix) Isolation switch opening and closing bus conversion current
• Appendix C (normative appendix) Grounding switch opening and closing induction current
• Appendix D (informative) Test voltage for the most unfavorable insulation position when grounding switch is operated (temporary approach)
• Appendix E (Normative) Gaseous and earthing switches used in gas-insulated and/or metal-enclosed switchgear Special requirements Current requirements
• Appendix G (Normative) Alternative test method for short-circuit current closure test
• Appendix H (Normative) Capacitive current opening and closing capability of air insulated disconnectors
• Reference