GB/T / IEC :2007

Transcription

1 Translated English of Chinese Standard: GB/T GB NATIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA ICS K 30 GB/T / IEC :2007 Replacing GB/T Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests (IEC :2007, IDT) 低压系统内设备的绝缘配合第 1 部分 : 原理 要求和试验 Issued on: April 24, 2008 Implemented on: December 1, 2008 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Page 1 of 90

2 Table of Contents Foreword Scope and object Normative references Terms and definitions Basis for insulation coordination Requirements and dimensioning rules Tests and measurements Annex A (Informative) Basic data on withstand characteristics of clearances 63 Annex B (Informative) Basic data on withstand characteristics of clearances 68 Annex C (Normative) Partial discharge test methods Annex D (Informative) Additional information on partial discharge test methods Annex E (Informative) Comparison of creepage distances specified in Table F.4 and clearances in Table A Annex F (Normative) Tables Bibliography Page 2 of 90

3 Foreword GB/T Insulation coordination for equipment within low-voltage systems consists of the following 5 parts: - Part 1: Principles, requirements and tests; - Part 2: Application guide; - Part 3: Use of coating, potting or moulding for protection against pollution; - Part 4: Consideration of high-frequency voltage stress; - Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2mm; This Part identically uses IEC :2007 Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests. This Part replaces GB/T Compared with GB/T , the main technical differences are as follows: - added the nominal voltage of the single phase system of Japan Power Grid 100 V or 100 V ~ 200 V, involving the nominal voltage of rated impulse voltage, rationalized voltage and different over-voltage control mode of the power supply system; - added basic parameters of electrical clearance tolerance characteristics less than 0.01 mm in Table A.1; - added Table F.7 Clearances to withstand steady-state voltages, temporary overvoltages or recurring peak voltages ; - added the minimum creepage distance relative to V ~ V voltage r.m.s.; - modified the original Figure 1 The size of the creepage distance determined for the material group I by the voltage and pollution degree and made it as the content of Annex E; modified the title to Comparison of creepage distances specified in Table F.4 and clearances in Table A.1 ; - modified the provisions involving in the creepage distance of rib; added Figure 2 Determination of the width (W) and height (H) of a rib ; Page 3 of 90

4 - modified Table F.5 (of which the title is now Test voltages for verifying clearances at different altitudes modified from Test voltages for verifying clearances at sea level ); added test voltage values at 200 m, 500 m above sea level; - modified the original Clause 4 (now Clause 5) Requirements and dimensioning rules so as to describe in more details about the test, the test purpose, the test apparatus and the possible alternative test; - modified Annex A, Annex B and Annex D from normative to informative, in accordance with IEC; - deleted the dielectric test of 2Un V which lasts for 1 min, but is not relevant to the electrical clearance verification; - deleted pollution degree 4 in Table F.4 and the original 4.2 (now 6.2). Annex C, Annex F of this Part are normative; Annex A, Annex B, Annex D and Annex E are informative. This Part was proposed by China Electrical Equipment Industry Association. This Part shall be under the jurisdiction of National Technical Committee on Low-voltage Electrical Appliances of Standardization Administration of China (SAC/TC 189). Main drafting organizations of this Part: Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. The drafting organizations of this Part: Hang Shen Holdings Group Limited, Zhejiang Delixi Electric Appliance Co., Ltd., Zhejiang Zhengtai Electric Appliance Co., Ltd., Schneider Electric ( China ) Investment Co., Ltd. Main drafters of this Part: Huang Jingye, Wu Qingyun, Li Hui. Drafters of this Part: He Guibing, Huang Rongrong, Ye Sufeng, Zhang Ping. Version of the standard substituted by this Part is: GB/T Page 4 of 90

5 Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests 1 Scope and object This Part of GB/T deals with insulation coordination for equipment within low-voltage systems. It applies to equipment for use up to 2000 m above sea level having a rated voltage up to a.c V with rated frequencies up to 30 khz, or a rated voltage up to d.c V. It specifies the requirements for clearances, creepage distances and solid insulation for equipment based upon their performance criteria. It includes methods of electric testing with respect to insulation coordination. The minimum clearances specified in this Part do not apply where ionized gases occur. Special requirements for such situations may be specified at the discretion of the relevant technical committee. This Part does not deal with distances - through liquid insulation, - through gases other than air, - through compressed air. NOTE 1 Insulation coordination for equipment within low-voltage systems with rated frequencies above 30 khz is given in IEC NOTE 2 Higher voltages may exist in internal circuits of the equipment. NOTE 3 Guidance for dimensioning for altitudes exceeding 2000 m is given in Table A.2. The object of this basic safety Part is to guide technical committees responsible for different equipment in order to rationalize their requirements so that insulation coordination is achieved. This Part provides the information necessary to give guidance to technical committees when specifying clearances in air, creepage distances and solid insulation for equipment. Care should be taken to see that manufacturers and technical committees are responsible for application of the requirements, as specified in this basic safety Page 5 of 90

6 publication, or make reference to it, where necessary, in standards for equipment within their scope. In the case of missing specified values for clearances, creepage distances and requirements for solid insulation in the relevant product standards, or even missing standards, this Part is applicable. 2 Normative references The following standards contain the provisions which, through reference in this Part of GB/T 16935, constitute the provisions of this Part. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Part. However, the parties who enter into agreement based on this Part are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Part. GB STANDARD voltages (neq IEC ) GB/T Electrical strength of insulating materials - Test methods - Part 1: Tests at power frequencies (idt IEC :1998) GB/T Environmental testing for electric and electronic products - Part 1: General and guidance (idt IEC :1988) GB/T Environmental testing for electric and electronic products - Part 2: Test methods - Tests B: Dry heat (idt IEC :1974) GB/T Environmental testing for electric and electronic products - Part 2: Testing method test Cab: Damp heat Steady state (idt IEC :2001) GB/T Environmental testing for electric and electronic products - Part 2: Test methods Test N: Change of temperature (idt IEC :1984) GB/T Electrotechnical terminology - Insulating solids, liquids and gases (eqv IEC 60050(212):1990) GB/T Electrotechnical terminology Generation, transmission and distribution of electricity - Operation (eqv IEC 60050(604):1987) GB/T Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions (idt IEC 60112:1979) GB/T Partial discharge measurements (idt IEC 60270:2000) Page 6 of 90

7 GB/T Thermal evaluation and classification of electrical insulation (eqv IEC 60085:1984) GB/T Guide to the drafting of electrical safety standard (eqv IEC Guide 104:1984) GB/T Protection against electric shock - Common aspects for installation and equipment (idt IEC 61140:2001) GB/T High-voltage test techniques for low-voltage equipment Part 1: Definitions, test and procedure requirements (eqv IEC :1992) GB/T High-voltage test techniques for low voltage equipment Part 2 Measuring system and test equipment (eqv IEC :1994) IEC 60050(151):2001 International Electrotechnical Vocabulary (IEV) - Chapter 151: Electrical and magnetic devices IEC 60050(826):2004 International Electrotechnical Vocabulary (IEV) - Part 826: Electrical installations IEC 60085:2004 Electrical insulation - Thermal classification IEC :1991 Surge arresters - Part 1: Non-linear resistor type gapped surge arresters for a.c. systems IEC 60112:2003 Method for the determination of the proof and the comparative tracking indices of solid insulating materials IEC (all parts) Electrical insulating materials - Properties for thermal endurance IEC :2001 Electrical installations of buildings - Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances Amendment 1 (2003) IEC :2005 Insulation coordination for equipment within low-voltage systems - Part 4: Consideration of high-frequency voltage stress IEC :2007 Insulation coordination for equipment within low-voltage systems - Part 5: A comprehensive method for determining clearances and creepage distances equal to or less than 2 mm 1)1 IEC Guide 104:1997 The preparation of safety publications and the use of 1 A second edition of IEC referred in IEC :2007 has not been published when IEC :2007 is published; it now has been published in July, Page 7 of 90