1、 IEC/TR 60725 Edition 3.0 2012-06 TECHNICAL REPORT RAPPORT TECHNIQUE Consideration of reference impedances and public supply network impedances for use in determining the disturbance characteristics of electrical equipment having a rated current 75 A per phase tude des impdances de rfrence et des im
2、pdances des rseaux publics dalimentation aux fins de la dtermination des caractristiques de perturbation des quipements lectriques utilisant un courant nominal 75 A par phase IEC/TR 60725:2012 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2012 IEC, Geneva, Switzerland All rights reserved. Unless
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16、re.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC/TR 60725 Edition 3.0 2012-06 TECHNICAL REPORT RAPPORT TECHNIQUE Consideration of reference impedances and public supply network impedances for use in determini
17、ng the disturbance characteristics of electrical equipment having a rated current 75 A per phase tude des impdances de rfrence et des impdances des rseaux publics dalimentation aux fins de la dtermination des caractristiques de perturbation des quipements lectriques utilisant un courant nominal 75 A
18、 par phase INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 33.100.01 PRICE CODE CODE PRIX ISBN 978-2-83220-161-9 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Mak
19、e sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 TR 60725 IEC:2012 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Systems of low-voltage supply 6 Three-phase su
20、pply systems . 6 3.1Single-phase two-wire supply systems 7 3.2Single-phase three-wire supply systems 7 3.3 4 Supply impedances 7 Typical residential premises 7 4.1Large residential, commercial and light industrial premises . 10 4.2General . 10 4.2.1Supply impedance relevant to the connection of thre
21、e-phase 4.2.2 equipment . 11 Supply impedances relevant to the connection of single-phase 4.2.3 equipment . 11 5 Reference impedances . 12 General . 12 5.1Reference impedances for equipment with current ratings 16 A . 12 5.2Overview . 12 5.2.150 Hz and 60 Hz low-voltage supply systems 13 5.2.2Refere
22、nce impedance for 50 Hz and 60 Hz equipment with current ratings 5.3 16 A and 75 A per phase . 15 6 Impedance at frequencies above the supply frequency . 15 Annex A (informative) Methods for determining the maximum modulus values of public electricity supply low-voltage network impedances relevant t
23、o three-phase services of more than 100 A per phase at 50 Hz . 16 Annex B (informative) Methods for determining the maximum modulus values of public electricity supply low-voltage network impedances relevant to three-phase services of more than 100 A per phase at 60 Hz . 24 Annex C (informative) Mea
24、surement of supply impedance and survey method . 26 Bibliography 29 Figure 1 Representation of a single-phase three-wire supply system . 7 Figure A.1 Model used for determining the impedance of a network line conductor from a transformer to a three-phase service cut-out 18 Figure A.2 Three-phase imp
25、edance diagram of a typical 500 kVA transformer and mains cable 19 Figure B.1 Model used for determining the impedance of a network line conductor from a transformer to a three-phase service cut-out 24 Figure C.1 Measurement of impedance at a customers premises 27 Table 1 Residential consumers compl
26、ex supply impedances at 50 Hz . 8 Table 2 Single-phase device capacities 100 A per phase . 9 Table 3 Three-phase service capacities 100 A per phase . 9 TR 60725 IEC:2012 3 Table 4 Single or two-phase service capacities 100 A per phase 10 Table 5 Three-phase service capacities 100 A per phase . 10 Ta
27、ble 6 Modulus values of supply impedance, in ohms at 50 Hz, relevant to the connection of three-phase equipment and having a 95 % probability of not being exceeded 11 Table 7 Modulus values of supply impedance, in ohms at 50 Hz, relevant to the connection of single-phase equipment and having a 95 %
28、probability of not being exceeded 12 Table 8 Reference impedances for testing purposes 13 Table 9 Reference impedances for 100 V/200 V and 120 V/240 V supply systems 100 A 14 Table 10 Reference impedances for 200 V to 240 V supply systems 100 A 14 Table 11 Reference impedances for 200 V to 240 V sup
29、ply systems, 100 A per phase . 15 Table 12 Reference impedances for testing purposes, for 200 V to 240 V supply systems, 100 A . 15 Table A.1 Modulus values of the maximum supply impedance, in ohms, of the line- conductors of 230 V/400 V, 50 Hz, public electricity supply networks, relevant to three-
30、phase services having service capacities of 200 A per phase 21 Table A.2 Modulus values of the maximum supply impedance, in ohms, of the line and neutral conductors of 230 V/400 V, 50 Hz, public electricity supply networks, relevant to three-phase services having service capacities of 200 A per phas
31、e . 22 Table C.1 Impedance values for copper conductor installation wiring . 28 4 TR 60725 IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CONSIDERATION OF REFERENCE IMPEDANCES AND PUBLIC SUPPLY NETWORK IMPEDANCES FOR USE IN DETERMINING THE DISTURBANCE CHARACTERISTICS OF ELECTRICAL EQUIPMENT HA
32、VING A RATED CURRENT 75 A PER PHASE FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questio
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43、 technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 60725, which is a technical report, has been prepared by subcommittee 77A: EMC
44、 Low frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility. This third edition cancels and replaces the second edition, published in 2005, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous
45、edition: new survey and other data from countries having public supply networks operating at 60 Hz have been included; recommendations that were applicable to 50 Hz systems are now mirrored by new recommendations that are relevant to 60 Hz systems. TR 60725 IEC:2012 5 The text of this technical repo
46、rt is based on the following documents: Enquiry draft Report on voting 77A/784/DTR 77A/789/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC
47、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. At this date, the publication will be reconfirmed, withdrawn
48、 replaced by a revised edition, or amended. 6 TR 60725 IEC:2012 CONSIDERATION OF REFERENCE IMPEDANCES AND PUBLIC SUPPLY NETWORK IMPEDANCES FOR USE IN DETERMINING THE DISTURBANCE CHARACTERISTICS OF ELECTRICAL EQUIPMENT HAVING A RATED CURRENT 75 A PER PHASE 1 Scope This Technical Report records the i
49、nformation that was available and the factors that were taken into account in arriving at the reference impedances that were incorporated in IEC 60555 and which are now incorporated in some parts of IEC 61000-3. In addition, information is given on the impedances of public supply networks associated with service current capacities 100 A per phase. 2 Normative references The following docu
