IEC TR 60909-2:2008
(Main)Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations
Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations
IEC 60909-2:2008(E) 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. It may be applied for calculating short-circuit currents in low-voltage networks if they are in accordance with typical equipment employed in the user's country. The collected data and their evaluation 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 given in this report. This second edition cancels and replaces the first edition published in 1992 and constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows:
- 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.
- Subclause 2.7 gives equations and figures for the calculation of the positive-sequence impedances of busbar configurations.
General Information
Standards Content (Sample)
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)
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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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 17.220.01; 29.240.20 ISBN 978-2-88910-327-0
® Registered trademark of the International Electrotechnical Commission
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– 2 – 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 equipment .6
2.1 General .6
2.2 Data of typical synchronous machines.7
2.3 Data of typical two-winding, three-winding and auto-transformers.10
2.4 Data of typical overhead lines, 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
Bibliography.43
Figure 1 – Subtransient reactance of synchronous machines 50 Hz and 60 Hz
(Turbogenerators, salient pole generators, motors SM and condensers SC) .8
Figure 2 – Rated Voltage U and rated power factor cosϕ of synchronous machines
rG rG
(Turbo generators, salient pole generators, moto
...
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