BS-EN-60909-3-2003.pdf
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1、BRITISH STANDARD BS EN 60909-3:2003 Short-circuit currents in three-phase a.c systems Part 3: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth The European Standard EN 60909-3:2003 has the status of a British Standard ICS
2、 17.220.01; 29.240.20 ? Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:01:32 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 60909-3:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 7 September 2
3、004 BSI 7 September 2004 ISBN 0 580 44395 7 National foreword This British Standard is the official English language version of EN 60909-3:2003. It is identical with IEC 60909-3:2003. The UK participation in its preparation was entrusted to Technical Committee PEL/73, Short circuit currents, which h
4、as the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section
5、entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compl
6、iance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related
7、 international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 32, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the docum
8、ent was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:01:32 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60909-3 NORME EUROPENNE EUROPISCHE NORM November 2003 CENELEC
9、European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwid
10、e for CENELEC members. Ref. No. EN 60909-3:2003 E ICS 17.220.01; 29.240.20 English version Short-circuit currents in three-phase a.c systems Part 3: Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth (IEC 60909-3:2003) Cour
11、ants de court-circuit dans les rseaux triphass courant alternatif Partie 3: Courants durant deux court-circuits monophass simultans spars la terre et courants de court-circuit partiels scoulant travers la terre (CEI 60909-3:2003) Kurzschlussstrme in Drehstromnetzen Teil 3: Strme bei Doppelerdkurzsch
12、luss und Teilkurzschlussstrme ber Erde (IEC 60909-3:2003) This European Standard was approved by CENELEC on 2003-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard wit
13、hout any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other langu
14、age made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France,
15、 Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:01:32 GMT+00:00 2007, Uncontrolled Copy,
16、(c) BSI Foreword The text of document 73/127/FDIS, future edition 2 of IEC 60909-3, prepared by IEC TC 73, Short-circuit currents, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60909-3 on 2003-11-01. The following dates were fixed: latest date by which the EN has t
17、o be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-11-01 Annexes designated “normative“ are part of the body of the standard. Annexe
18、s designated “informative“ are given for information only. In this standard, annex ZA is normative annexes A and B are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60909-3:2003 was approved by CENELEC as a European Standard without
19、any modification. _ Page 2 EN 609093:2003 Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:01:32 GMT+00:00 2007, Uncontrolled Copy, (c) BSI CONTENTS 1 Scope.5 2 Normative reference.6 3 Terms and definitions .6 4 Symbols .8 5 Currents during two separate simult
20、aneous line-to-earth short circuits9 5.1 Calculation method9 5.1.1 Initial symmetrical short-circuit current 9 5.1.2 Peak short-circuit current, symmetrical short-circuit breaking current and steady-state short-circuit current11 5.1.3 Distribution of line-to-earth short-circuit currents during two s
21、eparate simultaneous line-to-earth short circuits 11 6 Partial short-circuit currents flowing through earth in the case of an unbalanced short circuit 12 6.1 Calculation method12 6.1.1 General .12 6.1.2 Line-to-earth short circuit in a station.12 6.1.3 Line-to-earth short circuit far outside a stati
22、on.14 6.1.4 Line-to-earth short circuit in the vicinity of a station .16 6.1.5 Reduction factor for overhead lines and cables17 Annex A (informative) Example for the calculation of two separate simultaneous line- to-earth short-circuit currents20 Annex B (informative) Examples for the calculation of
23、 partial short-circuit currents through earth 22 Annex ZA (normative) Normative references to international publications with their corresponding European publications.32 Figure 1 Driving point impedance ZP of an infinite chain, composed of the earth-wire impedance ZW = ZWdT and the footing resistan
24、ce RT of the towers, with equal distances dT between towers 7 Figure 2 Driving point impedance ZPn of a finite chain with n towers, composed of the earth-wire impedance ZW = ZWdT, the footing resistance RT of the towers with equal distances dT between towers and the earthing impedance ZEB (Equation
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