IEC TS 62993-2017 Guidance for determination of clearances creepage distances and requirements for solid insulation for equipment with a rated voltage above 1000 V AC and 1500 V DC.pdf

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1、 IEC TS 62993 Edition 1.0 2017-07 TECHNICAL SPECIFICATION Guidance for determination of clearances, creepage distances and requirements for solid insulation for equipment with a rated voltage above 1 000 V AC and 1 500 V DC, and up to 2 000 V AC and 3 000 V DC IEC TS 62993:2017-07(en) THIS PUBLICATI

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11、Guidance for determination of clearances, creepage distances and requirements for solid insulation for equipment with a rated voltage above 1 000 V AC and 1 500 V DC, and up to 2 000 V AC and 3 000 V DC INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.080.30 ISBN 978-2-8322-4501-9 Registered tradema

12、rk of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC TS 62993:2017 IEC 2017 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 8 4 Basic information for the deter

13、mination of INSULATION requirements . 11 4.1 General . 11 4.2 Voltages . 12 4.2.1 General . 12 4.2.2 Determination of RECURRING PEAK VOLTAGE 12 4.3 OVERVOLTAGE categories. 12 4.4 Material groups . 13 4.5 POLLUTION DEGREES 14 4.5.1 General . 14 4.5.2 Degrees of POLLUTION in the MICRO-ENVIRONMENT . 14

14、 4.5.3 Conditions of conductive POLLUTION . 14 4.5.4 Clearances 14 5 Dimensioning rules 15 5.1 Clearances . 15 5.2 CREEPAGE DISTANCES 17 5.2.1 General . 17 5.2.2 Voltage 17 5.2.3 POLLUTION 17 5.2.4 Shape of insulating surface . 17 5.2.5 Relationship to CLEARANCE . 18 5.2.6 CREEPAGE DISTANCES where m

15、ore than one material is used or more than one POLLUTION DEGREE occurs 18 5.2.7 CREEPAGE DISTANCES split by floating conductive part 18 5.2.8 Dimensioning of CREEPAGE DISTANCES of BASIC INSULATION, SUPPLEMENTARY INSULATION and REINFORCED INSULATION 19 5.2.9 CREEPAGE DISTANCES for DC applications . 2

16、0 5.3 SOLID INSULATION . 21 5.3.1 General . 21 5.3.2 Withstand of voltage stresses 21 6 Tests and measurements . 21 6.1 Tests 21 6.1.1 General . 21 6.1.2 Test for verification of CLEARANCES 22 6.1.3 Tests for the verification of SOLID INSULATION . 24 6.2 Measuring CLEARANCES and CREEPAGE DISTANCES 2

17、7 Bibliography 28 Figure 1 RECURRING PEAK VOLTAGE . 12 Figure 2 Determination of the width (W) and height (H) of a rib 18 Table 1 RATED IMPULSE VOLTAGES according to OVERVOLTAGE CATEGORIES 13 IEC TS 62993:2017 IEC 2017 3 Table 2 Clearances to withstand TRANSIENT OVERVOLTAGES 15 Table 3 Dimensioning

18、of clearances to WORKING VOLTAGES, TEMPORARY OVERVOLTAGES or RECURRING PEAK VOLTAGES 16 Table 4 Altitude correction factors 17 Table 5 CREEPAGE DISTANCES to avoid failure due to tracking . 20 Table 6 Test voltages based on CLEARANCES and a test site altitude of 2 000 m above sea level . 23 Table 7 C

19、orrection factors according to test site altitude for test voltages for CLEARANCES 24 Table 8 Severities for conditioning of SOLID INSULATION 26 4 IEC TS 62993:2017 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ GUIDANCE FOR DETERMINATION OF CLEARANCES, CREEPAGE DISTANCES AND REQUIREMENTS FOR

20、SOLID INSULATION FOR EQUIPMENT WITH A RATED VOLTAGE ABOVE 1 000 V AC AND 1 500 V DC, AND UP TO 2 000 V AC AND 3 000 V DC FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National C

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31、in task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated effo

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33、formed into International Standards. IEC TS 62993, which is a technical specification, has been prepared by IEC technical committee 109: Insulation co-ordination for low-voltage equipment. IEC TS 62993:2017 IEC 2017 5 The text of this technical specification is based on the following documents: Enqu

34、iry draft Report on voting 109/158A/DTS 109/162/RVDTS Full information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. In this standard,

35、 the following print types are used: requirements: in roman type; NOTES: in small roman type; conformity and tests: in italic type; terms used throughout this standard which have been defined in Clause 3: SMALL ROMAN CAPITALS. The committee has decided that the contents of this publication will rema

36、in unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bil

37、ingual version of this publication may be issued at a later date. 6 IEC TS 62993:2017 IEC 2017 INTRODUCTION IEC TS 62993 is developed in a JWG between several interested committees: TC 9, SC 22G, TC 31, TC 66, TC 82, SC 121A, and ACOS under the leadership of TC 109. This document provides additional

38、 steps for a smooth transition between the low voltage (up to 1 000 V AC and 1 500 V DC) in IEC 60664 (all parts) and high voltage insulation coordination (although IEC 60071-1 is applicable from above 1 000 V, it only gives values starting at 3 600 V). IEC 60071-1 states that it does not cover the

39、requirements for human safety. Moreover IEC 60071-1 does not provide values for creepage distances. This document has been requested by several TCs dealing with equipment with a rated voltage above 1 000 V AC and 1 500 V DC up to 2 000 V AC and 3 000 VDC. It is not the intention to extend the limit

40、of low voltage range having a conventionally accepted limit of 1 000 V AC and 1 500 V DC into the high voltage range. IEC TS 62993:2017 IEC 2017 7 GUIDANCE FOR DETERMINATION OF CLEARANCES, CREEPAGE DISTANCES AND REQUIREMENTS FOR SOLID INSULATION FOR EQUIPMENT WITH A RATED VOLTAGE ABOVE 1 000 V AC AN

41、D 1 500 V DC, AND UP TO 2 000 V AC AND 3 000 V DC 1 Scope IEC TS 62993, which is a Technical Specification, gives guidance to technical committees which deal with equipment having a RATED VOLTAGE of more than 1 000 V AC and up to 2 000 V AC, or a RATED VOLTAGE of more than 1 500 V DC and up to 3 000

42、 V DC. RATED VOLTAGES up to 1 000 V AC and 1 500 V DC, as well as higher or lower internal voltages, are covered by IEC 60664-1. This document applies to equipment for use up to 2 000 m above sea level, and provides guidance for use at higher altitudes. This document gives guidance for CLEARANCES, C

43、REEPAGE DISTANCES and SOLID INSULATION for equipment to achieve safety. It includes methods of electric testing. NOTE Requirements for functional insulation are not specified as they are not regarded as safety requirements. This document does not deal with distances through liquid insulation, throug

44、h gases other than air, and through compressed air. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the

45、latest edition of the referenced document (including any amendments) applies. IEC 60068-2-2, Environmental testing Part 2-2: Tests Test B: Dry heat IEC 60068-2-14, Environmental testing Part 2-14: Tests Test N: Change of temperature IEC 60068-2-78, Environmental testing Part 2-78: Tests Test Cab: Da

46、mp heat, steady state IEC 60112:2003, Method for the determination of the proof and the comparative tracking indices of solid insulating materials IEC 60112:2003/AMD1:2009 IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems Part 1: Principles, requirements and tests IE

47、C 61180:2016, High-voltage test techniques for low-voltage equipment Definitions, test and procedure requirements, test equipment 8 IEC TS 62993:2017 IEC 2017 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological dat

48、abases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.1 CLEARANCE shortest distance in air between two conductive parts SOURCE: IEC 60050-581:2008, 581-27-76 3.2 CREE

49、PAGE DISTANCE shortest distance along the surface of a solid insulating material between two conductive parts SOURCE: IEC 60050-151:2001, 151-15-50 3.3 SOLID INSULATION solid insulating material, or a combination of solid insulating materials, placed between two conductive parts or between a conductive part and a body part SOURCE: IEC 60050-903:2015, 903-04-14 3.4 WORKING VOLTAGE highest RMS value of the AC or DC voltage across any particular insul