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SLOVENSKI STANDARD
01-september-2021
Jedrske elektrarne - Elektroenergetski sistemi - Analiza elektroenergetskih
sistemov (IEC 62855:2016)
Nuclear power plants - Electrical power systems - Electrical power systems analysis (IEC
62855:2016)
Kernkraftwerke - Elektrische Stromversorgung - Analyse der Stromversorgung (IEC
62855:2016)
Centrales nucléaires de puissance - Systèmes d’alimentation électrique - Analyse des
systèmes d’alimentation électrique (IEC 62855:2016)
Ta slovenski standard je istoveten z: EN IEC 62855:2021
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 62855
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2021
ICS 27.120.20
English Version
Nuclear power plants - Electrical power systems - Electrical
power systems analysis
(IEC 62855:2016)
Centrales nucléaires de puissance - Systèmes Kernkraftwerke - Elektrische Stromversorgung - Analyse
d'alimentation électrique - Analyse des systèmes der Stromversorgung
d'alimentation électrique (IEC 62855:2016)
(IEC 62855:2016)
This European Standard was approved by CENELEC on 2021-07-05. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62855:2021 E
European foreword
This document (EN IEC 62855:2021) consists of the text of IEC 62855:2016 prepared by IEC/TC 45
"Nuclear instrumentation".
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-07-05
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-07-05
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
As stated in the nuclear safety directive 2009/71/EURATOM, Chapter 1, Article 2, item 2, Member
States are not prevented from taking more stringent safety measures in the subject-matter covered by
the Directive, in compliance with Community law.
In a similar manner, this European standard does not prevent Member States from taking more
stringent nuclear safety and/or security measures in the subject-matter covered by this standard.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN and CENELEC
websites.
Endorsement notice
The text of the International Standard IEC 62855:2016 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 60038 NOTE Harmonized as EN 60038
IEC 60364-5-52 NOTE Harmonized as HD 60364-5-52
IEC 60880 NOTE Harmonized as EN 60880
IEC 60964 NOTE Harmonized as EN IEC 60964
IEC 61225 NOTE Harmonized as EN IEC 61225
IEC 61508-1 NOTE Harmonized as EN 61508-1
IEC 61508-2 NOTE Harmonized as EN 61508-2
IEC 61508-3 NOTE Harmonized as EN 61508-3
IEC 61508-4 NOTE Harmonized as EN 61508-4
IEC 61513 NOTE Harmonized as EN 61513
IEC 62003 NOTE Harmonized as EN IEC 62003
IEC 62138 NOTE Harmonized as EN IEC 62138
IEC 62271-200 NOTE Harmonized as EN 62271-200
IEC 62305-1 NOTE Harmonized as EN 62305-1
IEC 62305-3 NOTE Harmonized as EN 62305-3
IEC 62305-4 NOTE Harmonized as EN 62305-4
IEC 62340 NOTE Harmonized as EN 62340
IEC 62566 NOTE Harmonized as EN 62566
IEC 62645 NOTE Harmonized as EN IEC 62645
IEC 63046 NOTE Harmonized as EN IEC 63046
ISO/IEC 27001 NOTE Harmonized as EN ISO/IEC 27001
ISO/IEC 27002 NOTE Harmonized as EN ISO/IEC 27002
IEC 62855
Edition 1.0 2016-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Electrical power systems – Electrical power systems
analysis
Centrales nucléaires de puissance – Systèmes d’alimentation électrique –
Analyse des systèmes d’alimentation électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-3589-8
– 2 – IEC 62855:2016 IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references. 11
3 Terms and definitions . 11
4 Symbols and abbreviations . 12
5 Electrical power system analyses . 13
5.1 Overview of typical studies . 13
5.1.1 Transient stability analyses . 13
5.1.2 Load flow studies . 13
5.1.3 Transient and dynamic studies . 13
5.1.4 Short circuit studies . 14
5.1.5 Electrical protection coordination and selectivity . 14
5.1.6 Lightning protection studies . 14
5.2 Applicability of analyses to different plant states . 14
5.2.1 General . 14
5.2.2 Recommendations . 14
5.3 Selection, verification and validation of analytical tools . 15
5.3.1 General . 15
5.3.2 Recommendations . 16
5.4 Electrical power system model . 17
5.5 Grid and NPP connection . 17
5.6 Updating of system analyses . 17
5.7 Prerequisites for the performance of electrical studies . 17
5.8 Acceptance requirements . 18
6 Off-site power transient stability analyses . 18
6.1 General . 18
6.2 Recommendation . 18
6.3 Acceptance requirements . 18
7 AC on-site power system analyses . 18
7.1 General . 18
7.2 Load flow studies . 19
7.2.1 General . 19
7.2.2 Recommendations . 19
7.2.3 Acceptance requirements . 19
7.3 Transient studies . 19
7.3.1 General . 19
7.3.2 Faulted conditions . 19
7.3.3 Bus transfer studies . 20
7.3.4 Motor starting and reacceleration studies . 21
7.3.5 House load operation . 22
7.3.6 Voltage disturbances . 22
7.3.7 Voltage surge caused by switching and malfunctions . 23
7.3.8 Load sequencer studies . 23
7.3.9 Frequency studies . 24
7.4 Fault studies . 24
IEC 62855:2016 IEC 2016 – 3 –
7.4.1 Short-circuit studies . 24
7.4.2 Earth fault (degraded insulation) studies . 25
7.5 Electrical protection coordination studies . 25
7.5.1 Recommendations . 25
7.5.2 Acceptance requirements . 26
8 DC system and uninterruptible AC system analyses . 26
8.1 Load flow studies . 26
8.1.1 General . 26
8.1.2 Recommendations . 26
8.1.3 Acceptance requirements . 27
8.2 Transient studies . 27
8.2.1 Rectifier . 27
8.2.2 Inverter/UPS and bypass switch . 27
8.3 Fault studies . 28
8.3.1 Short circuit studies . 28
8.3.2 Earth fault (degraded insulation) studies . 28
8.4 Electrical protection coordination studies . 28
8.4.1 Recommendations . 28
8.4.2 Acceptance requirements . 29
9 Miscellaneous analyses . 29
9.1 Lightning protection studies . 29
9.1.1 General . 29
9.1.2 Recommendation . 29
9.1.3 Acceptance requirements .
...