GB / IEC :2011

Transcription

1 Translated English of Chinese Standard: GB GB NATIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA ICS K 31 GB / IEC :2011 Replacing GB Low-voltage switchgear and controlgear assemblies - Part 1: General rules (IEC :2011, IDT) Issued on: December 31, 2013 Implemented on: January 13, 2015 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Page 1 of 179

2 Table of Contents Foreword... 8 Introduction Scope Normative references Terms and definitions General terms Constructional units of assemblies External design of assemblies Structural parts of assemblies Conditions of installation of assemblies Insulation characteristics Protection against electric shock Characteristics Verification Manufacturer/user Symbols and abbreviations Interface characteristics General Voltage ratings Current ratings Page 2 of 179

3 5.4 Rated diversity factor (RDF) Rated frequency (fn) Other characteristics Information assembly designation marking Documentation Device and/or component identification Service conditions Normal service conditions Special service conditions Conditions during transport, storage and installation Constructional requirements Strength of materials and parts Degree of protection provided by an assembly enclosure Clearances and creepage distances Protection against electric shock Incorporation of switching devices and components Internal electrical circuits and connections Cooling Terminals for external conductors Performance requirements Page 3 of 179

4 9.1 Dielectric properties Temperature rise limits Short-circuit protection and short-circuit withstand strength Electromagnetic compatibility (EMC) Design verification General Strength of materials and parts Degree of protection of assemblies Clearances and creepage distances Protection against electric shock and integrity of protective circuits Incorporation of switching devices and components Internal electrical circuits and connections Terminals for external conductors Dielectric properties Verification of temperature rise Short-circuit withstand strength Electromagnetic compatibility (EMC) Mechanical operation Routine verification General Degree of protection of enclosures Page 4 of 179

5 11.3 Clearances and creepage distances Protection against electric shock and integrity of protective circuits Incorporation of built-in components Internal electrical circuits and connections Terminals for external conductors Mechanical operation Dielectric properties Wiring, operational performance and function Annex A (normative) Minimum and maximum cross-section of copper conductors suitable for connection to terminals for external conductors (see 8.8) Annex B (normative) Method of calculating the cross-sectional area of protective conductors with regard to thermal stresses due to currents of short duration Annex C (informative) User information template Annex D (informative) Design verification Annex E (informative) Rated diversity factor E.1 General E.2 Rated diversity factor of an assembly E.3 Rated diversity factor of a group of outgoing circuits E.4 Rated diversity factor and intermittent duty Annex F (normative) Measurement of clearances and creepage distances Page 5 of 179

6 F.1 Basic principles F.2 Use of ribs Annex G (normative) Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of the equipment Annex H (informative) Operating current and power loss of copper conductors Annex I Annex J (normative) Electromagnetic compatibility (EMC) J.1 General J.2 Terms and definitions Annex K (normative) Protection by electrical separation K.1 General K.2 Electrical separation K.3 Class II equipment or equivalent insulation Annex L (informative) Clearances and creepage distances for North American region Annex M (informative) North American temperature rise limits Annex N (normative) Operating current and power loss of bare copper bars Annex O (informative) Guidance on temperature rise verification O.1 General O.2 Temperature-rise limits O.3 Test Page 6 of 179

7 O.4 Calculation O.5 Design rules Annex P (normative) Verification of the short-circuit withstand strength of busbar structures by comparison with a tested reference design by calculation P.1 General P.2 Terms and definitions P.3 Method of verification P.4 Conditions for application Bibliography Page 7 of 179

8 Foreword All technical content of this Part is mandatory. GB 7251 Low-voltage switchgear and controlgear assemblies includes the following parts: - Part 0: Guidance to specifying assemblies - Part 1: General rules - Part 2: Power switchgear and controlgear assemblies - Part 3: Distribution boards operated by unskilled persons 1) - Part 4: Assemblies for construction sites (ACS) 2) - Part 5: Particular requirements for assemblies for power distribution in public networks - Part 6: Busbar trunking systems (busways) - Part 7: Assemblies for specific applications such as marinas, camping sites, market squares, electric vehicles charging stations This Part is Part 1 of GB This Part was drafted according to the rules given in GB/t This Part replaces GB Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies. Compared this Part with GB , main technical changes are as follows: - DELETE the dual functions of the original GB /IEC as the product standard itself and the General standard of GB 7251/IEC series; - GB is only a General standard for the GB 7251 series of products; - GB replaced the original GB product standards; 1 ) Being declared a project. 2) Being declared a project. Page 8 of 179

9 - GB/T Electrical insulation - Thermal classification (IEC 60085:2004, IDT) - GB/T (all parts) Electrical insulating materials - Properties of thermal endurance [IEC (all parts)] - GB Low-voltage switchgear and controlgear - Part 1: General rules (IEC :2011, MOD) - GB/T Plastics - Methods of exposure to laboratory light sources Part 2: Xenon-arc sources (ISO :1994, IDT) - GB (all parts) Electrical installations of buildings [IEC (all parts)] - GB Electrical installations of buildings - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements, protective conductors and protective bonding conductors (IEC :2002, IDT) - GB Electrical installations of buildings - Part 5: Selection and erection of electrical equipment Chapter 53: Switchgear and controlgear (IEC :1994, IDT) - GB Electric installations of buildings - Part 5: Selection and erection of electrical equipment - Chapter 52: Wiring systems (IEC :1993, IDT) - GB/T Electromagnetic compatibility (EMC ) - Testing and measurement techniques - Electrostatic discharge immunity test (IEC :2001, IDT) - GB/T Electromagnetic compatibility(emc) - Testing and measurement techniques - Variation of power frequency immunity test (IEC :2002, IDT) - GB/T Electromagnetic compatibility - Testing and measurement techniques - Radiated radio-frequency electromagnetic field immunity test (IEC :2006, IDT) - GB/T Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances induced by radio-frequency fields (IEC :2006, IDT) - GB/T (all parts) High-voltage test techniques for low-voltage equipment [IEC (all parts)] - GB Electromagnetic compatibility - Generic standards - Emission STANDARD for industrial environments (IEC :1997, IDT) Page 10 of 179

10 - GB/T Empty enclosures for Low-voltage switchgear and controlgear assemblies - General requirements (IEC 62208:2002, IDT) This Part makes the following editorial modifications: - CHANGE this standard BY this Part ; - USE the decimal symbol. to replace the symbol, ; - DELETE the foreword of the international standard. This Part was proposed by China Electrical Equipment Industry Association. This Part shell be under the jurisdiction of National Technical Committee on Standardization of Low-voltage Switchgear and Controlgear Assemblies (SAC/TC 266). Drafting organizations of this Part: Tianjin Electric Drive Design Institute Co., Ltd., Changshu Switch Manufacturing Co., Ltd. (former Changshu Switch Factory), Power Transmission and Distribution Branch of Shanghai Electric Group Co., Ltd., Chuan Kai Electric Co., Ltd., Tianjin Tianchuan Electronic Control & Power Distribution Co., Ltd., China Quality Certification Center, National Electric Control Equipment Quality Supervision and Inspection Center, Gansu Institute of Electrical Science and Technology (former Tianshui Great Wall Electric Test Research Institute), Guangzhou Baiyun Electrical Equipment Co., Ltd., Anhui Xinlong Electric Appliance Co., Ltd., Shanghai Kawamura Electric Co., Ltd., Zhuhai Guangle Power Busway Co., Ltd., Zhejiang Electric (Hangzhou) Group Co., Ltd., Jiangsu Borui Electric Co., Ltd., Zhongfa Electric Co., Ltd., Fatai Electric (Jiangsu) Co., Ltd., Daquan Group Co., Ltd., Hangzhou Hangkai Electric Co., Ltd., Chengdu Kexing Power Electric Co., Ltd., Hangzhou Yanmei Assembly Manufacturing Co., Ltd., Guangdong Zhujiang Switchgear Co., Ltd., Huapeng Group Co., Ltd., Jiuchuan Group Co., Ltd., Jiangxi Hengzhu Electric Cabinet Lock Co., Ltd., Yuyao Power Equipment Repair Plant, Shanghai Nanhua Lanling Electric Co., Ltd., Suzhou Electric Appliance Research Institute Co., Ltd., Fujian Senda Electric Co., Ltd., Zhejiang Fangyuan Electrical Equipment Testing Co., Ltd., Linhai Yaoming Power Equipment Company, Ningbo Yaohua Electric Technology Co., Ltd., Zhenjiang Siemens Bus Co., Ltd., Tianjin Tianchuan Yingke Science and Technology Development Co., Ltd., Jilin Longding Electric Co., Ltd., Jiangsu Modern Power Technology Co., Ltd., China Coal Electric Co., Ltd., Zhenjiang Moeller Electric Appliance Co., Ltd. Main drafters of this Part: Zhong Mingzhen, Wang Yang, Liu Jie, Guan Ruiliang, Wang Chunling, Xia Jinhui, Cui Jing, Chen Xin, Mo Weiqiang, Hu Xinming, Wang Yi, Yuan Yuchao, Cheng Jun, Zheng Gungle, Lin Bibao, Zhu Wentang, Yu Chunsheng, Jin Minyi, Pei Jun, Mao Shuiquan, Zeng Qingcai, Huang Wukang, Zhang Bocheng, Chen Yunhua, Liu Xiaolin, Zhong Jijiang, Zhou Qihong, Zhou Fubo, Hu Delin, Chen Zeyin, Page 11 of 179

11 Low-voltage switchgear and controlgear assemblies - Part 1: General rules 1 Scope This Part of the GB 7251 lays down the definitions and states the service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies (hereafter referred to as assemblies) (see 3.1.1). This Part cannot be used alone to specify an assembly or used for a purpose of determining conformity, assemblies shall comply with the relevant part of the GB 7251 series; Parts 2 onwards. This Part applies to low-voltage switchgear and controlgear assemblies only when required by the relevant assembly standard as follows: - assemblies for which the rated voltage does not exceed V in case of a.c. or V in case of d.c.; - stationary or movable assemblies with or without enclosure; - assemblies intended for use in connection with the generation, transmission, - distribution and conversion of electric energy, and for the control of electric energy consuming equipment; - assemblies designed for use under special service conditions, for example in ships and in rail vehicles provided that the other relevant specific requirements are complied with; NOTE 1: Supplementary requirements for assemblies in ships are covered by GB assemblies designed for electrical equipment of machines provided that the other relevant specific requirements are complied with. NOTE 2: Supplementary requirements for assemblies forming part of a machine are covered by the GB 7251 series. This Part applies to all assemblies whether they are designed, manufactured and verified on a one-off basis or fully standardised and manufactured in quantity. Page 15 of 179

12 The manufacture and/or assembly may be carried out other than by the original manufacturer (see ). This Part does not apply to individual devices and self-contained components, such as motor starters, fuse switches, electronic equipment, etc. which will comply with the relevant product standards. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T Basic environmental testing procedures - Part 2-11: Tests - Test Ka: Salt mist (IEC :1981, IDT) GB/T Environmental testing - Part 2-2: Tests - Test B: Dry heat (IEC :2007, IDT) GB/T Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic ( h cycle) (IEC :2005, IDT) GB/T Basic and safety principles for man-machine interface, marking and identification - Coding principles for indicators and actuators (IEC 60073:2002, IDT) GB/T Basic and safety principles for man-machine interface, marking and identification - Actuating principles (IEC 60447:2004, IDT) GB Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989, IDT) GB/T Rubber insulated cables - Rated voltages up to and including 450/750 V- Part 3: Heat resistant silicone insulated cables (IEC :1994, IDT) GB/T Fire Hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure (IEC :2000, IDT) GB/T Fire hazard testing - Part 2-11: Glowing/hot-wire based test methods - Glow-wire flammability test method for end-products (IEC :2000, IDT) GB/T Fire hazard testing - Part 11-5: Test flames - Needle-flame test method - Apparatus, confirmatory test arrangement and guidance (IEC :2004, IDT) Page 16 of 179

13 GB/T Plastics - Determination of flexural properties (ISO 178:2001, IDT) GB/T Low-voltage electrical installations - Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances (IEC :2007, IDT) GB Low-voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock (IEC :2005, IDT) GB/T Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests (IEC :2007, IDT) GB/T Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests (IEC :2004, IDT) GB/T Electromagnetic compatibility (EMC) - Part 4-13: Testing and measurement techniques - Harmonics and interharmonics including mains signalling at a.c. power port, low-frequency immunity tests (IEC :2002 3), IDT) GB/T Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test (IEC :2004, IDT) GB/T Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test (IEC :2005, IDT) GB/T Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code) (IEC 62262:2002, IDT) GB/T A method of temperature-rise assessment by extrapolation for partially type-tested assemblies (PTTA) of low-voltage switchgear and controlgear (IEC/TR 60890: IEC/TR 60890:1087/Amd1:1995, IDT) IEC 60085:2007 Electrical insulation - Thermal evaluation and designation IEC (all parts) Electrical insulating materials - Properties of thermal endurance IEC :1993 Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V - Part 3: Non-sheathed cables for fixed wiring 3) There is a unified version 1.1 (2009), which includes IEC (2002) and its amendment 1 (2009). Page 17 of 179

14 IEC :1994, Rubber insulated cables - Rated voltages up to and including 450/750 V- Part 4: Cords and flexible cables IEC (all parts), Low-voltage electrical installations IEC :2009 Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems IEC :2001 Electrical installations of buildings - Part 5-53: Selection and erection of electrical equipment - Isolation, switching and control IEC :2011 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors IEC (all parts) Low-voltage switchgear and controlgear assemblies IEC 60445:2010 Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors IEC :1993 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods IEC :2007 Low-voltage switchgear and controlgear - Part 1: General rules IEC :2008 Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test IEC :2006 Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques - Radiated, radio frequency, electromagnetic field immunity test 4) IEC :2008 Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radiofrequency fields IEC :2009 Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement techniques - Power frequency magnetic field immunity test EC :2006 Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission standard for industrial environments 4) 4) There is a unified version 3.2 (2010), which includes IEC (2006) and its amendment 1 (2007) and amendment 2 (2009). 5) There is a unified version 2.1 (2011), which includes IEC (2006) and its amendment 1 (2010). Page 18 of 179

15 IEC Preparation of documents used in electrotechnology - Part 1: Rules IEC (all parts) High-voltage test techniques for low-voltage equipment IEC/TS 61201:2007 Use of conventional touch voltage limits - Application guide IEC (all parts) Low-voltage switchgear and controlgear assemblies IEC Empty enclosures for low-voltage switchgear and controlgear assemblies - General requirements IEC Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 1: Basic rules IEC Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 2: Classification of objects and codes for classes IEC/CISPR 11:2009 Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement 6) IEC/CISPR 22 Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement ISO 179 (all parts) Plastics - Determination of Charpy impact strength ISO 2409:2007 Paints and varnishes - Cross-cut test ISO :2003 Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 3: Assessment of degree of rusting ISO :2006 Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc lamps 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 General terms ) There is a unified version 5.1 (2010), which includes CISPR 11 (2009) and its amendment 1 (2010). Page 19 of 179

16 Bibliography [1] GB/T Electrotechnical terminology - Generation transmission and distribution of electricity - General [2] GB/T Electrotechnical terminology - Generation transmission and distribution of electricity - Operation [3] GB/T Electrotechnical terminology - Electrical installations [4] GB/T Electrotechnical terminology - Earthing and protection against electric shock [5] GB/T Electrotechnical terminology - Insulators [6] GB/T Electrotechnical terminology - Electrical and magnetic devices [7] GB/T Conductors of insulated cables [8] GB/T Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions [9] GB/T Polyvinyl chloride insulated cables of rated voltages up to and including 450/750V - Part 4:Sheathed cables for fixed wiring [10] GB 5226 (all parts) Safety of machinery - Electrical equipment of machines [11] GB Electrical safety of machinery - Electrical equipment of machines - Part 1: General requirements [12] GB/T General specification for low-voltage switchgear and controlgear assemblies in ships [13] GB/T Protection against electric shock - Common aspects for installation and equipment [14] GB Electromagnetic compatibility (EMC) - Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current 16 A per phase and not subject to conditional connection [15] GB/Z Electromagnetic compatibility - Limits - Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated current greater than 16A [16] GB/T A method for assessing the short-circuit withstand Strength of partially type-tested assemblies (PTTA) [17] GB/Z Low-voltage switchgear and controlgear - Overcurrent protective devices Page 178 of 179

17 - Part 1: Application of short-circuit ratings GB [18] GB/Z Low-voltage switchgear and controlgear - Overcurrent protective devices - Part 2: Selectivity under over-current conditions [19] IEC 60038, IEC standard voltages [20] IEC :1984, International Electrotechnical Vocabulary - Chapter 441: Switchgear, controlgear and fuses [21] IEC (all parts), Explosive atmospheres [22] IEC SN:2011, Graphical symbols for use on equipment [23] IEC :2004, Power cables with extruded insulation and their accessories for rated voltages from 1 kv (U m = 1.2 kv) up to 30 kv (U m = 36 kv) - Part 1: Cables for rated voltages of 1 kv (U m = 1.2 kv) and 3 kv (U m = 3.6 kv) [24] IEC (all parts), Low-voltage switchgear and controlgear [25] IEC :2005, Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current emissions (equipment input current 16 A per phase) [26] IEC , Electromagnetic compatibility (EMC) - Part 3-11: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems - Equipment with rated current 75 A and subject to conditional connection [27] IEC , Electromagnetic compatibility (EMC) - Part 3-12: Limits - Limits for harmonic currents produced by equipment connected to public low-voltage systems with input current 16 A and 75 A per phase [28] IEC , Electromagnetic compatibility (EMC) - Part 6-1: Generic standards - Immunity for residential, commercial and light-industrial environments [29] IEC , Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity for industrial environments [30] IEC , Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission standard for residential, commercial and light-industrial environments [31] IEC/TR :2007, Low-voltage switchgear and controlgear - Overcurrent protective devices - Part 1: Application of short-circuit ratings [32] IEC (all parts), Electrical apparatus for use in the presence of combustible dust [33] DIN 43671:1975, Copper busbars; design for continuous current END Page 179 of 179