1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationLetter symbols to be used in electrical technology Part 7: Power generation, transmission and distributionBS EN 60027-7:2010National forewordThis British Standard is the UK imple
2、mentation of EN 60027-7:2010. It isidentical to IEC 60027-7:2010.The UK participation in its preparation was entrusted to Technical CommitteeSS/7, General metrology, quantities, units and symbols.A list of organizations represented on this committee can be obtained onrequest to its secretary.This pu
3、blication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010 ISBN 978 0 580 55966 2 ICS 01.060; 01.075; 29.020; 29.240.01Compliance with a British Standard cannot confer immunity from legal obligations.This British Stand
4、ard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2010.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60027-7:2010EUROPEAN STANDARD EN 60027-7 NORME EUROPENNE EUROPISCHE NORM September 2010 CENELEC European Comm
5、ittee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC mem
6、bers. Ref. No. EN 60027-7:2010 E ICS 01.060 English version Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution (IEC 60027-7:2010) Symboles littraux utiliser en lectrotechnique - Partie 7: Production, transport et distribution de lnergie lectr
7、ique (CEI 60027-7:2010) Formelzeichen fr die Elektrotechnik - Teil 7: Energieerzeugung, -bertragung und -verteilung (IEC 60027-7:2010) This European Standard was approved by CENELEC on 2010-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condi
8、tions for giving this European Standard the status of a national standard without 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 th
9、ree official versions (English, French, German). A version in any other language 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 electrotechni
10、cal committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switze
11、rland and the United Kingdom. EN 60027-7:2010 - ii Foreword The text of document 25/391/CDV, future edition 1 of IEC 60027-7, prepared by IEC TC 25, Quantities and units, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60027-7 on 2010-09-01. Attention is drawn to the
12、 possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication
13、 of an identical national standard or by endorsement (dop) 2011-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-09-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60027-7:2010 was approve
14、d by CENELEC as a European Standard without any modification. _ BS EN 60027-7:2010- iii - EN 60027-7:2010 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of
15、 this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD app
16、lies. Publication Year Title EN/HD Year IEC 60027-1 + A1 + A2 1995 1997 2005 Letter symbols to be used in electrical technology - Part 1: General EN 60027-1 - + A21) 2006 - 2007 IEC 60027-2 2005 Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics EN 60027-
17、22)2007 IEC 60038 2009 IEC standard voltages - - IEC 60050-121 + A1 1998 2002 International Electrotechnical Vocabulary (IEV) - Part 121: Electromagnetism - - - - IEC 60050-131 + A1 2002 2008 International Electrotechnical Vocabulary (IEV) - Part 131: Circuit theory - - - - IEC 60050-141 2004 Intern
18、ational electrotechnical vocabulary - Part 141: Polyphase systems and circuits - - IEC 60050-151 2001 International Electrotechnical Vocabulary (IEV) - Part 151: Electrical and magnetic devices - - IEC 60050-195 + A1 1998 2001 International Electrotechnical Vocabulary (IEV) - Chapter 195: Earthing a
19、nd protection against electric shock - - - - IEC 60050-411 + A1 1996 2007 International Electrotechnical Vocabulary (IEV) - Chapter 411: Rotating machinery - - - - IEC 60050-421 1990 International electrotechnical vocabulary (IEV) - Chapter 421: Power transformers and reactors - - IEC 60050-441 + A1
20、 1984 2000 International Electrotechnical Vocabulary (IEV) - Chapter 441: Switchgear, controlgear and fuses - - - - 1) EN 60027-1 includes A1 to IEC 60027-1. 2) EN 60027-2 is superseded by EN 80000-13:2008, which is based on IEC 80000-13:2008. BS EN 60027-7:2010EN 60027-7:2010 - iv Publication Year
21、Title EN/HD Year IEC 60050-442 1998 International Electrotechnical Vocabulary - Part 442: Electrical accessories - - IEC 60050-448 1995 International Electrotechnical Vocabulary (IEV) - Chapter 448: Power system protection - - IEC 60050-466 1990 International electrotechnical vocabulary (IEV) - Chap
22、ter 466: Overhead lines - - IEC 60050-601 + A1 1985 1998 International Electrotechnical Vocabulary (IEV) - Chapter 601: Generation, transmission and distribution of electricity - General - - - - IEC 60050-603 + A1 1986 1998 International electrotechnical vocabulary - Chapter 603: Generation, transmi
23、ssion and distribution of electricity - Power system planning and management - - - - IEC 60050-604 + A1 1987 1998 International Electrotechnical Vocabulary (IEV) - Chapter 604: Generation, transmission and distribution of electricity - Operation - - - - IEC 60050-811 1991 International electrotechni
24、cal vocabulary (IEV) - Chapter 811: Electric traction - - IEC 60909-0 2001 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents EN 60909-0 2001 IEC/TR 60909-1 2002 Short-circuit currents in three-phase e.c. systems - Part 1: Factors for the calculation of short-circui
25、t currents according to IEC 60909-0 - - IEC/TR 60909-2 2008 Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations - - IEC 60909-3 2003 Short-circuit currents in three-phase a.c systems - Part 3: Currents during two separate s
26、imultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth EN 60909-33)2003 IEC 62428 2008 Electric power engineering - Modal components in three-phase a.c. systems - Quantities and transformations EN 62428 2008 IEC 80000-6 2008 Quantities and units - Part 6: E
27、lectromagnetism EN 80000-6 2008 3) EN 60909-3 is superseded by EN 60909-3:2010, which is based on IEC 60909-3:2009. BS EN 60027-7:2010 4 60027-7 IEC:2010 CONTENTS 1 Scope.5 2 Normative references .5 3 Letter symbols for AC, three-phase AC, and other network quantities.7 4 Letter symbols for space an
28、d time 17 5 Letter symbols for numerical values and ratios of quantities . 20 6 Subscripts and superscripts24 6.1 Subscripts for natural quantities and components in three-phase AC systems . 24 6.2 Subscripts for operating conditions25 6.3 Subscripts for electrical equipment 25 6.4 Subscripts for lo
29、cations, reference points, and fault locations 27 6.5 Superscripts 28 6.6 Multiple subscripts and their succession 28 Bibliography29 BS EN 60027-7:201060027-7 IEC:2010 5 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY Part 7: Power generation, transmission, and distribution 1 Scope This part of I
30、EC 60027 is applicable to generation, transmission, and distribution of electric energy. It gives names and letter symbols for quantities and units. In addition, rules for multiple subscripts and their succession are given. This part of IEC 60027 is an addition to IEC 60027-1. Therefore letter symbo
31、ls already given in IEC 60027-1 are repeated only if they have a special meaning in the field of power generation, transmission, and distribution or if they are used in this field with special subscripts. Guidance on the use of capital and lower case letters, is given in IEC 60027-1, 2.1, and guidan
32、ce on the representation of complex quantities,is given in IEC 60027-1, 1.6. Therefore in many cases only U is given instead of U, UU = or u. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited
33、 applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60027-1:1992, Letter symbols to be used in electrical technology Part 1: General Amendment 1:1997 Amendment 2:2005 IEC 60027-2:2005, Letter symbols to be used in electrical technol
34、ogy Part 2: Telecom-munications and electronics IEC 60038:2009, IEC standard voltages IEC 60050-121:1998, International Electrotechnical Vocabulary Part 121: Electromagne-tism Amendment 1 (2002) IEC 60050-131:2002, International Electrotechnical Vocabulary Part 131: Circuit theory Amendment 1 (2008)
35、 IEC 60050-141:2004, International Electrotechnical Vocabulary Part 141: Polyphase systems and circuits IEC 60050-151:2001, International Electrotechnical Vocabulary Part 151: Electrical and magnetic devices IEC 60050-195:1998, International Electrotechnical Vocabulary Part 195: Earthing and protect
36、ion against electric shock Amendment 1 (1998) BS EN 60027-7:2010 6 60027-7 IEC:2010 IEC 60050-411:1996, International Electrotechnical Vocabulary Chapter 411: Rotating machines Amendment 1 (2007) IEC 60050-421:1990, International Electrotechnical Vocabulary Chapter 421: Power trans-formers and react
37、ors IEC 60050-441:1984, International Electrotechnical Vocabulary Chapter 441: Switchgear, controlgear and fuses Amendment 1 (2000) IEC 60050-442:1998, International Electrotechnical Vocabulary Part 442: Electrical accessories IEC 60050-448:1995, International Electrotechnical Vocabulary Chapter 448
38、: Power system protection IEC 60050-466:1990, International Electrotechnical Vocabulary Chapter 466: Overhead lines IEC 60050-601:1985, International Electrotechnical Vocabulary Chapter 601: Generation, transmission and distribution of electricity General Amendment 1 (1998) IEC 60050-603:1986, Inter
39、national Electrotechnical Vocabulary Chapter 603: Generation, transmission and distribution of electricity Power system planning and management Amendment 1 (1998) IEC 60050-604:1987, International Electrotechnical Vocabulary Chapter 604: Generation, transmission and distribution of electricity Opera
40、tion Amendment 1 (1998) IEC 60050-811:1991, International Electrotechnical Vocabulary Chapter 811: Electric traction IEC 60909-0:2001, Short-circuit currents in three-phase AC systems Part 0: Calculation of currents IEC/TR 60909-1:2002, Short-circuit currents in three-phase AC systems Part 1: Factor
41、s for the calculation of short-circuit currents according to IEC 60909-0 IEC/TR 60909-2:2008, Short-circuit currents in three-phase AC systems Part 2: Data of electrical equipment for short-circuit current calculations IEC 60909-3:2003, Short-circuit currents in three-phase AC systems Part 3:Current
42、s during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth IEC 62428:2008, Electric power engineering Modal components in three-phase a.c. systems Quantities and transformations IEC 80000-6:2008, Quantities and units Part 6: Electromagnet
43、ism BS EN 60027-7:201060027-7 IEC:2010 7 3 Letter symbols for AC,three-phase AC,and other network quantities Quantities UnitsUnit, coherentwiththe SIItemnumber IEV and/or IECnumber NameofquantityChief symbolReserve symbolRemarks NameSymbolRemarks 101 line-to-earth capacitance ofa line CLiCLiEi= 1,2,
44、3 in three-phase ACnetworksfaradF 102 line-to-line capacitance ofa line CLiLkCLiki, k= 1,2,3 withi kin three-phase ACnetworksfaradF 103 131-14-29 60027-2 hybridmatrixH Namesand symbolsfor the elementsare given in IEC 60027-2.one,ohm,siemens1,S,104 electriccurrentI The generalsymbolIisused in case of
45、three-phase ACnetworksifthe threecurrentsare equalornearlyequal.ampere A105 441-17-06 441-17-07 60909-0 prospective breaking current,breaking currentIbIaCurrentofthe firstopening pole ofa switching device (circuitbreaker) or a fuse.ampere A106 capacitive charging currentIC3nCUIC=where isthe angular
46、frequency,Cisthe positive-sequence capacity,and Unisthe nominalvoltage ofthe three-phase ACline.ampere A107 capacitive earth-faultcurrentICeICeis thecapacitivesingleline-to-earthfault currentin a networkwith isolated neutral(IEV601-02-24).ampere A108 131-11-22 directcurrentIdIDCaverage value,for ins
47、tance in the case ofa direct currentlink For the qualifier DC,see IEC 60050-151,151-15-02 ampere A109 442-01-23 earth faultcurrentIeSee items107 and 121.ampere A110 field (excitation)currentIFIfCurrentin the field winding ofa machine.ampere ABS EN 60027-7:2010 8 60027-7 IEC:2010 Quantities UnitsUnit
48、, coherentwiththe SIItemnumber IEV and/or IECnumber NameofquantityChief symbolReserve symbolRemarks NameSymbolRemarks 111 no-load field (excitation) currentI0FIf0ampere A112 60909-0 steady-state short-circuitcurrentata short-circuitlocation IkIk3The steady state short-circuitcurrentin the r.m.s.valu
49、e ofa three-phase short-circuitcurrentata short-circuitlocation in a network,whichremains afterthedecayofall transient phenomena.Short-circuit currents withsubscript k insolidlyearthed or impedance earthed networks(IEV601-02-25,IEV601-02-26).ampere A113 60909-1 transientshort-circuitcurrentata short-circuitlocation kI3kIThe transientshortcircuitcurrentisthe r.m.s.value ofa three-phase short-circuitcurrentata short-circuitloc
