1、 IEC/TR 60909-2 Edition 2.0 2008-11 TECHNICAL REPORT Short-circuit currents in three-phase a.c. systems Part 2: Data of electrical equipment for short-circuit current calculations IEC/TR 60909-2:2008(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserv
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9、T Short-circuit currents in three-phase a.c. systems Part 2: Data of electrical equipment for short-circuit current calculations INTERNATIONAL ELECTROTECHNICAL COMMISSION X ICS 17.220.01; 29.240.20 PRICE CODE ISBN 2-8318-1016-1 Registered trademark of the International Electrotechnical Commission 2
10、TR 60909-2 IEC:2008(E) CONTENTS FOREWORD.4 1 General 6 1.1 Scope and object.6 1.2 Normative references 6 2 Data for electrical equipment6 2.1 General .6 2.2 Data of typical synchronous machines.7 2.3 Data of typical two-winding, three-winding and auto-transformers10 2.4 Data of typical overhead line
11、s, single and double circuits 14 2.5 Data of typical high-voltage, medium-voltage and low-voltage cables 20 2.6 Data of typical asynchronous motors .35 2.7 Busbars.38 Annex A (informative) Information from National Committees.42 Bibliography43 Figure 1 Subtransient reactance of synchronous machines
12、50 Hz and 60 Hz (Turbogenerators, salient pole generators, motors SM and condensers SC) .8 Figure 2 Rated Voltage rG U and rated power factor rG cos of synchronous machines (Turbo generators, salient pole generators, motors and condensers 50 Hz and 60 Hz) .9 Figure 3 Unsaturated and saturated synchr
13、onous reactance of two-pole turbo generators 50 Hz and 60 Hz (relative values)9 Figure 4 Three-winding transformer (No. 6 of Table 3). 12 Figure 5 Rated short-circuit voltage u krof unit transformers in power stations (ST) with or without on-load tap-changer 13 Figure 6 Rated short-circuit voltages
14、u krof network transformers 14 Figure 7 Positive-sequence reactance L ) 1 ( X X = of low-voltage and medium-voltage overhead lines 50 Hz, Cu or Al, with one circuit according to Equation (15) of IEC 60909-0 .16 Figure 8 Positive-sequence reactance L ) 1 ( X X = of overhead lines 50 Hz (60 Hz- values
15、 converted to 50 Hz) .19 Figure 9 Type of overhead lines.20 Figure 10 Single-core cable 64 kV / 110 kV with lead sheath 4 23 Figure 11 Reduction factor depending on the inducing current for cables with one lead sheath and two overlapping steel tapes, f = 50 Hz 335 Figure 12 Reduction factor dependin
16、g on the inducing current for cables with three lead sheaths and two overlapping steel tapes, f = 50 Hz 335 Figure 13 Ratio rM LR I I / of low-voltage and medium-voltage asynchronous motors, 50 Hz and 60 Hz.37 Figure 14 Product rM rM x cos of low-voltage and medium-voltage motors, 50 Hz and 60 Hz .3
17、8 Figure 15 Geometric mean distance g L1L1= g L2L2= g L3L3of the main conductors .39 Figure 16 Factor and for the calculation of ) 1 ( X given in Equation (34) .40 TR 60909-2 IEC:2008(E) 3 Table 1 Actual data of typical synchronous generators, motors and condensers 7 Table 2 Actual data of typical t
18、wo-winding transformers (NT: network; ST: power station) .10 Table 3 Actual data of typical three-winding transformers 11 Table 4 Actual data of typical autotransformers with and without tertiary winding.12 Table 5 Actual data of typical overhead lines 50 Hz and 60 Hz 18 Table 6 Actual data of typic
19、al electric cables21 Table 7 Equations for the positive-sequence and the zero-sequence impedance of cables.22 Table 8 Single-core cables 64/110 kV, 2XK2Y, 3 1 240 . 1 200 rm, Cu with lead sheath 24 Table 9 10-kV-cables N2XS2Y.25 Table 10 20-kV-cables N2XS2Y .26 Table 11 Positive-sequence and zero-se
20、quence impedance of four low-voltage single-core cables NYY 4 1 q n . (Case No. 2a in Table 7) .27 Table 12 Low-voltage cable NYY .29 Table 13 Low-voltage cable NYY with three and a half copper conductors .30 Table 14 Low-voltage cable NYCWY with four copper conductors32 Table 15 Low-voltage cable N
21、YCWY33 Table 16 Actual data of typical asynchronous motors.36 Table 17 Actual data of distribution busbars.38 Table 18 Example for the calculation of ) 1 ( X for busbars using Figures 15 and 16 .41 Table A.1 Information received from National Committees .42 4 TR 60909-2 IEC:2008(E) INTERNATIONAL ELE
22、CTROTECHNICAL COMMISSION _ SHORT-CIRCUIT CURRENTS IN THREE-PHASE AC SYSTEMS Part 2: Data of electrical equipment for short-circuit current calculations FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechn
23、ical 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 publishes International Standards, Technical Specifications,
24、 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, gov
25、ernmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decision
26、s or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for internati
27、onal use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order
28、to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearl
29、y indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall
30、attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal
31、fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this public
32、ation. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. How
33、ever, a 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 60909-2, which is a technical report, has been prepared by IEC technica
34、l committee 73: Short-circuit currents. This technical report is to be read in conjunction with IEC 60909-0 and IEC 60909-3. This second edition cancels and replaces the first edition published in 1992. This edition constitutes a technical revision. The significant technical changes with respect to
35、the previous edition are as follows: TR 60909-2 IEC:2008(E) 5 Subclause 2.5 gives equations and examples for the calculation of the positive-, the negative and the zero-sequence impedances and reduction factors for high-, medium and low-voltage cables with sheaths and shields earthed at both ends. S
36、ubclause 2.7 gives equations and figures for the calculation of the positive-sequence impedances of busbar configurations. The text of this technical report is based on the following documents: Enquiry draft Report on voting 73/142/DTR 73/145/RVC Full information on the voting for the approval of th
37、is standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 60909, published under the general title Short-circuit currents in three-phase a.c. systems, can be found
38、 on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result 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,
39、 withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 TR 60909-2 IEC:2008(E) SHORT-CIRCUIT CURRENTS IN THREE-PHASE AC SYSTEMS Part 2: Data of electrical equipment for short-circuit current calculations 1 General 1.1 Scope and
40、object This part of IEC 60909 comprises data of electrical equipment collected from different countries to be used when necessary for the calculation of short-circuit currents in accordance with IEC 60909-0. Generally, electrical equipment data are given by the manufacturers on the name plate or by
41、the electricity supplier. In some cases, however, the data may not be available. The data in this report may be applied for calculating short-circuit currents in low-voltage networks if they are in accordance with typical equipment employed in the users country. The collected data and their evaluati
42、on may be used for medium- or high-voltage planning purposes and also for comparison with data given by manufacturers or electricity suppliers. For overhead lines and cables the electrical data may in some cases also be calculated from the physical dimensions and the material following the equations
43、 given in this report. Thus this technical report is an addition to IEC 60909-0. It does not, however, change the basis for the standardized calculation procedure given in IEC 60909-0 and IEC 60909-3. 1.2 Normative references The following referenced documents are indispensable for the application o
44、f this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60909-0:2001, Short-circuit currents in three-phase a.c. systems Part 0: Calculation of currents IEC 60909-3:- 1 , Shor
45、t-circuit currents in three-phase a.c. systems Part 3: Currents du-ring two separate simultaneous line-to-earth short-circuit currents and partial short-circuit currents flowing through earth 2 Data for electrical equipment 2.1 General The data presented are necessary for the calculation of short-ci
46、rcuit currents. They are sometimes presented in the form of curve sheets and sometimes in the form of examples in tables. In the case of easy equations they are given for the calculations of positive-sequence and zero-sequence short-circuit impedances for overhead lines and cables. 1To be published.
47、 TR 60909-2 IEC:2008(E) 7 In all, 15 National Committees provided information in response to a questionnaire sent out before the first edition of this report. Table 1 of the first edition of this report is given in Annex A. In some cases, average values or characteristic trends as function of rated
48、power, rated voltage, etc. are given. 2.2 Data of typical synchronous machines Characteristic data of synchronous machines are listed in Table 1. The reactances are given as relative values related to rG 2 rG rG / S U Z = (see IEC 60909-0). Sometimes they are given in %. In Figure 1 the sub-transien
49、t reactances of synchronous machines (generators, motors and condensers) in the direct axis of 50 Hz or 60 Hz machines are plotted as a function of the rated power. Table 1 Actual data of typical synchronous generators, motors and condensers Rated appar. power Rated voltage and deviation b)Power factor Relative values of reactances and d.c time constant Note National Commit- tee Type
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