IEC 60909-3-2009

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IEC 60909-3
Edition 3.0 2009-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Short-circuit currents in three-phase AC systems –
Part 3: Currents during two separate simultaneous line-to-earth short circuits
and partial short-circuit currents flowing through earth
Courants de court-circuit dans les réseaux triphasés à courant alternatif –
Partie 3: Courants durant deux courts-circuits monophasés simultanés séparés
à la terre et courants de court-circuit partiels s'écoulant à travers la terre
IEC 60909-3:2009
®
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IEC 60909-3
Edition 3.0 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Short-circuit currents in three-phase AC systems –
Part 3: Currents during two separate simultaneous line-to-earth short circuits
and partial short-circuit currents flowing through earth
Courants de court-circuit dans les réseaux triphasés à courant alternatif –
Partie 3: Courants durant deux courts-circuits monophasés simultanés séparés
à la terre et courants de court-circuit partiels s'écoulant à travers la terre
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE XA
ICS 17.220.01; 29.240.20
PRICE CODE
CODE PRIX
ISBN 978-2-88910-328-7
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
®
– 2 – 60909-3 © IEC:2009
CONTENTS
FOREWORD...........................................................................................................................5
1 Scope and object..............................................................................................................7
2 Normative references .......................................................................................................8
3 Terms and definitions .......................................................................................................8
4 Symbols .........................................................................................................................10
5 Calculation of currents during two separate simultaneous line-to-earth short
circuits ...........................................................................................................................12
5.1 Initial symmetrical short-circuit current ..................................................................12
5.1.1 Determination of )(1
M and )(2
M...............................................................12
5.1.2 Simple cases of two separate simultaneous line-to-earth short
circuits.......................................................................................................13
5.2 Peak short-circuit current, symmetrical short circuit breaking current and
steady-state short-circuit current ...........................................................................13
5.3 Distribution of the currents during two separate simultaneous line-to-earth
short circuits..........................................................................................................14
6 Calculation of partial short-circuit currents flowing through earth in case of an
unbalanced short circuit..................................................................................................14
6.1 General .................................................................................................................14
6.2 Line-to-earth short circuit inside a station ..............................................................15
6.3 Line-to-earth short circuit outside a station............................................................16
6.4 Line-to-earth short circuit in the vicinity of a station...............................................18
6.4.1 Earth potential UETn at the tower n outside station B ..................................19
6.4.2 Earth potential of station B during a line-to earth short circuit at the
tower n......................................................................................................19
7 Reduction factor for overhead lines with earth wires .......................................................20
8 Calculation of current distribution and reduction factor in case of cables with
metallic sheath or shield earthed at both ends................................................................21
8.1 Overview ...............................................................................................................21
8.2 Three-core cable ...................................................................................................22
8.2.1 Line-to-earth short circuit in station B ........................................................22
8.2.2 Line-to-earth short circuit on the cable between station A and
station B....................................................................................................23
8.3 Three single-core cables .......................................................................................26
8.3.1 Line-to-earth short circuit in station B ........................................................26
8.3.2 Line-to-earth short circuit on the cable between station A and
station B....................................................................................................26
Annex A (informative) Example for the calculation of two separate simultaneous line-
to-earth short-circuit currents................................................................................................30
Annex B (informative) Examples for the calculation of partial short-circuit currents
through earth ........................................................................................................................33
Annex C (informative) Example for the calculation of the reduction factor r1 and the
current distribution through earth in case of a three-core cable .............................................43
Annex D (informative) Example for the calculation of the reduction factor r3 and the
current distribution through earth in case of three single-core cables ....................................48

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