1、 IEC 61472 Edition 3.0 2013-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Live working Minimum approach distances for a.c. systems in the voltage range 72,5 kV to 800 kV A method of calculation Travaux sous tension Distances minimales dapproche pour des rseaux courant alternatif de tension comprise
2、 entre 72,5 kV et 800 kV Une mthode de calcul IEC 61472:2013 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electroni
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16、z-nous: csciec.ch. IEC 61472 Edition 3.0 2013-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Live working Minimum approach distances for a.c. systems in the voltage range 72,5 kV to 800 kV A method of calculation Travaux sous tension Distances minimales dapproche pour des rseaux courant alternatif d
17、e tension comprise entre 72,5 kV et 800 kV Une mthode de calcul INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE X ICS 13.260; 29.240.20; 29.260.99 PRICE CODE CODE PRIX ISBN 978-2-83220-717-8 Registered trademark of the International Electrotechnical Commission Ma
18、rque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 61472 IEC:2013 CONTENTS FOREWORD . 4 1 Sc
19、ope . 6 2 Terms, definitions and symbols 6 2.1 Terms and definitions 6 2.2 Symbols used in the normative part of the document . 8 3 Methodology . 9 4 Factors influencing calculations 10 4.1 Statistical overvoltage . 10 4.2 Gap strength . 10 4.3 Calculation of electrical distance D U. 11 4.3.1 Genera
20、l equation . 11 4.3.2 Factors affecting gap strength . 11 5 Evaluation of risks 16 6 Calculation of minimum approach distance D A. 17 Annex A (informative) Ergonomic distance . 18 Annex B (informative) Overvoltages . 20 Annex C (informative) Dielectric strength of air 24 Annex D (informative) Gap fa
21、ctor k g26 Annex E (informative) Allowing for atmospheric conditions 28 Annex F (informative) Influence of floating conductive objects on the dielectric strength 32 Annex G (informative) Live working near contaminated, damaged or moist insulation 40 Bibliography 45 Figure 1 Illustration of two float
22、ing conductive objects of different dimensions and at different distances from the axis of the gap . 13 Figure 2 Typical live working tasks . 15 Figure B.1 Ranges of u e2at the open ended line due to closing and reclosing according to the type of network (meshed or antenna) with and without closing
23、resistors and shunt reactors 22 Figure F.1 Influence of the length of the floating conductive objects phase to earth rod-rod configuration 250 s /2 500 s impulse 35 Figure F.2 Influence of the length of the floating conductive objects phase to phase conductor-conductor configuration 250 s /2 500 s i
24、mpulse . 36 Figure F.3 Reduction of the dielectric strength as a function of the length D for constant values of Phase to earth rod-rod configuration 37 Figure F.4 Reduction of the dielectric strength as a function of the length P for constant values of Phase to phase conductor-conductor configurati
25、on 37 Figure G.1 Strength of composite insulators affected by simulated conductive and semi-conductive defects . 43 Table 1 Average k avalues . 12 Table 2 Floating conductive object factor k f. 14 Table B.1 Classification of overvoltages according to IEC 60071-1 20 61472 IEC:2013 3 Table D.1 Gap fac
26、tors for some actual phase to earth configurations . 27 Table E.1 Atmospheric factor k afor different reference altitudes and values of U 90. 30 Table G.1 Example of maximum number of damaged insulators calculation (gap factor 1,4) . 41 Table G.2 Example of maximum number of damaged insulators calcu
27、lation (gap factor 1,2) . 42 4 61472 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LIVE WORKING MINIMUM APPROACH DISTANCES FOR A.C. SYSTEMS IN THE VOLTAGE RANGE 72,5 kV TO 800 kV A METHOD OF CALCULATION FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organizatio
28、n for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC pu
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37、ttention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights
38、. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61472 has been prepared by technical committee 78: Live working. This third edition cancels and replaces the second edition of IEC 61472 published in 2004. It constitutes a technical revisio
39、n. This document has been prepared according to the requirements of IEC 61477: Live working Minimum requirements for the utilization of tools, devices and equipment, where applicable. Significant changes with regard to the second edition are the following: clarification of the scope; review of the d
40、efinitions; clarification of the methodology of determining whether live working is permissible and the calculation of the minimum approach distances; 61472 IEC:2013 5 modification of the basic equation for calculation of the minimum approach distance; introduction of Table 1 for altitude correction
41、 factor simplification k a ; introduction of criteria in presence of composite insulator and clarification on the use of insulator factor k i ; review of the informative Annex F on the influence of floating conductive objects on the dielectric strength; review of the informative Annex G on live work
42、ing near contaminated, damaged or moist insulation. The text of this standard is based on the following documents: FDIS Report on voting 78/1004/FDIS 78/1010/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This p
43、ublication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. A
44、t this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users sho
45、uld therefore print this document using a colour printer. 6 61472 IEC:2013 LIVE WORKING MINIMUM APPROACH DISTANCES FOR A.C. SYSTEMS IN THE VOLTAGE RANGE 72,5 kV TO 800 kV A METHOD OF CALCULATION 1 Scope This International Standard describes a method for calculating the minimum approach distances for
46、 live working, at maximum voltages between 72,5 kV and 800 kV. This standard addresses system overvoltages and the working air distances or tool insulation between parts and/or workers at different electric potentials. The required withstand voltage and minimum approach distances calculated by the m
47、ethod described in this standard are evaluated taking into consideration the following: workers are trained for, and skilled in, working in the live working zone; the anticipated overvoltages do not exceed the value selected for the determination of the required minimum approach distance; transient
48、overvoltages are the determining overvoltages; tool insulation has no continuous film of moisture or measurable contamination present on the surface; no lightning is seen or heard within 10 km of the work site; allowance is made for the effect of conducting components of tools; the effect of altitud
49、e, insulators in the gap, etc, on the electric strength is taken into consideration. For conditions other than the above, the evaluation of the minimum approach distances may require specific data, derived by other calculation or obtained from additional laboratory investigations on the actual situation. 2 Terms, definitions and symbols For the purpose
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