EN 60909-0:2016

Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents

IEC 60909-0:2016 is applicable to the calculation of short-circuit currents in low-voltage three-phase AC systems, and in high-voltage three-phase AC systems, operating at a nominal frequency of 50 Hz or 60 Hz. It establishes a general, practicable and concise procedure leading to results which are generally of acceptable accuracy and deals with the calculation of short-circuit currents in the case of balanced or unbalanced short circuits. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - contribution of windpower station units to the short-circuit current; - contribution of power station units with ful size converters to the short-circuit current; - new document structure.

Kurzschlussströme in Drehstromnetzen - Teil 0: Berechnung der Ströme

Courants de court-circuit dans les réseaux triphasés à courant alternatif - Partie 0: Calcul des courants

L'IEC 60909-0:2016 est applicable au calcul des courants de court-circuit dans les réseaux triphasés basse tension à courant alternatif, et dans les réseaux triphasés haute tension à courant alternatif, fonctionnant à une fréquence nominale de 50 Hz ou de 60 Hz. Elle établit une procédure générale, réalisable et concise conduisant à des résultats qui sont en général d'une précision acceptable. Et traite du calcul des courants de court-circuit dans le cas de courts-circuits symétriques et dissymétriques. Cette deuxième édition annule et remplace la première édition parue en 2001. Cette édition constitue une révision technique. Elle inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - contribution des groupes de production éoliens au courant de court-circuit; - contribution des groupes de production avec convertisseurs grande capacité au courant de court-circuit; - nouvelle structure du document.

Kratkostični toki v izmeničnih trifaznih sistemih - 0. del: Računanje tokov

Standard IEC 60909-0:2016 se uporablja za izračun kratkostičnih tokov v nizkonapetostnih izmeničnih trifaznih sistemih in visokonapetostnih izmeničnih trifaznih sistemih, ki delujejo pri nominalni frekvenci 50 Hz ali 60 Hz. Uveljavlja splošen, izvedljiv in strnjen postopek z rezultati, ki so običajno sprejemljive natančnosti, ter obravnava izračun kratkostičnih tokov v primeru uravnovešenih in neuravnovešenih kratkih stikov. Druga izdaja razveljavlja in nadomešča prvo izdajo, objavljeno leta 2001. Ta izdaja je tehnično popravljena izdaja. Ta izdaja vključuje naslednje znatne tehnične spremembe glede na prejšnjo izdajo:
– prispevek enot vetrnih elektrarn h kratkostičnemu toku;
– prispevek enot elektrarn s pretvorniki polne velikosti h kratkostičnemu toku;
– nova struktura dokumentov.

General Information

• Status: Published
• Publication Date: 09-Jun-2016
• Withdrawal Date: 09-Jun-2019
• ICS: 17.200.01 - Thermodynamics in general
• ICS: 17.220.01 - Electricity. Magnetism. General aspects
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: CLC/SR 73 - Short-circuit currents
• Drafting Committee: IEC/TC 73 - IEC_TC_73
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 10-Jun-2016
• Completion Date: 10-Jun-2016
• Ref Project: SIST EN 60909-0:2016 - Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents

Relations

• Replaces: EN 60909-0:2001 - Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
• Effective Date: 22-Oct-2014

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2016
1DGRPHãþD
SIST EN 60909-0:2002
.UDWNRVWLþQLWRNLYL]PHQLþQLKWULID]QLKVLVWHPLKGHO5DþXQDQMHWRNRY
Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
Kurzschlussströme in Drehstromnetzen - Teil 0: Berechnung der Ströme
Courants de court-circuit dans les réseaux triphasés à courant alternatif - Partie 0: Calcul
des courants
Ta slovenski standard je istoveten z: EN 60909-0:2016
ICS:
17.220.01 Elektrika. Magnetizem. Electricity. Magnetism.
Splošni vidiki General aspects
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60909-0
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2016
ICS 17.220.01; 29.240.20 Supersedes EN 60909-0:2001
English Version
Short-circuit currents in three-phase a.c. systems -
Part 0: Calculation of currents
(IEC 60909-0:2016)
Courants de court-circuit dans les réseaux triphasés à Kurzschlussströme in Drehstromnetzen -
courant alternatif - Teil 0: Berechnung der Ströme
Partie 0: Calcul des courants (IEC 60909-0:2016)
(IEC 60909-0:2016)
This European Standard was approved by CENELEC on 2016-03-03. 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 without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60909-0:2016 E
European foreword
The text of document 73/172/CDV, future edition 2 of IEC 60909-0, prepared by IEC/TC 73
"Shortcircuit currents" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN 60909-0:2016.
The following dates are fixed:
(dop) 2016-12-10
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2019-06-10
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60909-0:2001.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60909-0:2016 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60865-1 NOTE Harmonized as EN 60865-1.
IEC 62428 NOTE Harmonized as EN 62428.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu
Publication Year Title EN/HD Year

IEC 60038 (mod) 2009 IEC standard voltages EN 60038 2011
IEC 60050-131 -  International Electrotechnical - -
Vocabulary (IEV) -
Part 131: Circuit theory
IEC/TR 60909-1 2002 Short-circuit currents in three-phase e.c. - -
systems -
Part 1: Factors for the calculation of short-
circuit 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 2009 Short-circuit currents in three-phase a.c EN 60909-3 2010
systems -
Part 3: Currents during two separate
simultaneous line-to-earth short-circuits
and partial short-circuit currents flowing
through earth
IEC/TR 60909-4 2000 Short-circuit currents in three-phase a.c. - -
systems -
Part 4: Examples for the calculation of
short-circuit currents
IEC 60909-0 ®
Edition 2.0 2016-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Short-circuit currents in three-phase a.c. systems –

Part 0: Calculation of currents

Courants de court-circuit dans les réseaux triphasés à courant alternatif –

Partie 0: Calcul des courants
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.01; 29.240.20 ISBN 978-2-8322-3158-6

– 2 – IEC 60909-0:2016 © IEC 2016
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references. 8
3 Terms and definitions . 8
4 Symbols, subscripts and superscripts . 13
4.1 General . 13
4.2 Symbols . 13
4.3 Subscripts . 15
4.4 Superscripts . 16
5 Characteristics of short-circuit currents: calculating method . 16
5.1 General . 16
5.2 Calculation assumptions . 19
5.3 Method of calculation . 20
5.3.1 Equivalent voltage source at the short-circuit location . 20
5.3.2 Symmetrical components . 22
6 Short-circuit impedances of electrical equipment . 23
6.1 General . 23
6.2 Network feeders . 23
6.3 Transformers . 25
6.3.1 Two-winding transformers . 25
6.3.2 Three-winding transformers . 25
6.3.3 Impedance correction factors for two- and three-winding network
transformers . 27
6.4 Overhead lines and cables . 28
6.5 Short-circuit current-limiting reactors . 29
6.6 Synchronous machines . 29
6.6.1 Synchronous generators . 29
6.6.2 Synchronous compensators and motors. 31
6.7 Power station units . 31
6.7.1 Power station units with on-load tap-changer . 31
6.7.2 Power station units without on-load tap-changer . 32
6.8 Wind power station units . 33
6.8.1 General . 33
6.8.2 Wind power station units with asynchronous generator . 33
6.8.3 Wind power station units with doubly fed asynchronous generator . 34
6.9 Power station units with full size converter . 35
6.10 Asynchronous motors . 35
6.11 Static converter fed drives . 36
6.12 Capacitors and non-rotating loads . 36
7 Calculation of initial short-circuit current . 36
7.1 General . 36
7.1.1 Overview . 36
7.1.2 Maximum and minimum short-circuit currents . 41
7.1.3 Contribution of asynchronous motors to the short-circuit current . 42
7.2 Three-phase initial short-circuit current . 43
7.2.1 General . 43

IEC 60909-0:2016 © IEC 2016 – 3 –
7.2.2 Short-circuit currents inside a power station unit with on-load tap-
changer . 44
7.2.3 Short-circuit currents inside a power station unit without on-load tap-
changer . 46
7.3 Line-to-line short circuit . 47
7.4 Line-to-line short circuit with earth connection . 47
7.5 Line-to-earth short circuit . 49
8 Calculation of peak short-circuit current . 49
8.1 Three-phase short circuit . 49
8.1.1 Single-fed and multiple single-fed short circuits . 49
8.1.2 Multiple-fed short circuit . 51
8.2 Line-to-line short circuit . 52
8.3 Line-to-line short circuit with earth connection . 52
8.4 Line-to-earth short circuit . 52
9 Calculation of symmetrical breaking current . 53
9.1 Three-phase short circuit . 53
9.1.1 Symmetrical breaking current of synchronous machines. 53
9.1.2 Symmetrical breaking current of asynchronous machines . 54
9.1.3 Symmetrical breaking current of power station units with doubly fed
asynchronous generator . 55
9.1.4 Symmetrical breaking current of power station units with full size
converter . 55
9.1.5 Symmetrical breaking current of network feeder . 56
9.1.6 Symmetrical breaking current in
...