IEC 61225:2019

Nuclear power plants - Instrumentation, control and electrical power systems - Requirements for static uninterruptible DC and AC power supply systems

IEC 61225:2019

Name:IEC 61225:2019   Standard name:Nuclear power plants - Instrumentation, control and electrical power systems - Requirements for static uninterruptible DC and AC power supply systems
Standard number:IEC 61225:2019   language:English and French language
Release Date:14-Feb-2019   technical committee:SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
Drafting committee:WG 11 - TC 45/SC 45A/WG 11   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 61225
Edition 3.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Instrumentation, control and electrical power systems –
Requirements for static uninterruptible DC and AC power supply systems

Centrales nucléaires de puissance – Systèmes d'instrumentation, de contrôle-
commande et d'alimentation électrique – Exigences pour les systèmes
d'alimentation en courant alternatif et en courant continu statiques sans
interruption




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IEC 61225
Edition 3.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Instrumentation, control and electrical power systems –

Requirements for static uninterruptible DC and AC power supply systems

Centrales nucléaires de puissance – Systèmes d'instrumentation, de contrôle-

commande et d'alimentation électrique – Exigences pour les systèmes

d'alimentation en courant alternatif et en courant continu statiques sans

interruption
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-6382-2

– 2 – IEC 61225:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviated terms . 11
5 System requirements . 11
5.1 General . 11
5.2 Function and description . 12
5.2.1 Preamble . 12
5.2.2 Designations . 14
5.2.3 Direct current systems . 14
5.2.4 Alternating current systems . 14
5.3 System divisions . 15
5.4 System boundaries . 15
6 Functional requirements for static uninterruptible power supplies . 15
6.1 Static uninterruptible power supplies for systems important to safety . 15
6.2 Batteries and battery chargers . 16
6.3 Inverters and bypass switches . 17
6.4 UPS . 18
6.5 Converters used for voltage stabilization . 18
6.6 I&C power supply using DC/DC-converters and AC/DC-converters . 19
7 Requirements for distribution systems . 19
7.1 System aspects . 19
7.2 Load allocation . 19
7.3 Electrical aspects . 21
7.4 Earthing . 22
8 Effects of loads on supply quality. 22
8.1 General . 22
8.2 Electromagnetic interference. 22
8.3 Transients . 22
8.4 Load current . 23
8.5 Power supplies to loads of lower safety classification. 23
9 Monitoring and protection . 23
9.1 General . 23
9.2 Monitoring . 24
9.3 Electrical protection . 24
10 Qualification of equipment . 25
11 Design to cope with ageing . 25
12 Testing . 25
13 Maintenance . 26
Annex A (informative)  Examples of voltage input variations . 27
Annex B (informative) Examples of specifications . 29
B.1 Example 1: Specification for an DC power supply for equipment requiring a
non-interruptible supply. 29

B.2 Example 2: Specification for AC power supply for equipment requiring a non-
interruptible supply . 30
B.3 Example 3: Specification for DC power supply with DC/DC converter for
equipment . 31
B.4 Human factor engineering programme . 31
Bibliography . 33

Figure 1 – System boundary . 13
Figure 2 – Example of one division of an uninterruptible power supply system . 20
Figure 3 – Example of I&C uninterruptible AC power supply system . 21
Figure A.1 – Example of voltage variations on the on-site AC power system during
clearing of a transmission system fault . 27
Figure A.2 – Example of on-site voltage profile after loss of load (transfer to house
load operation). 27
Figure A.3 – Example of simulated safety bus voltages, double open phase condition

in the 400 kV line to the unit transformer . 28

Table B.1 – Example 1 . 29
Table B.2 – Example 2 . 30
Table B.3 – Example 3 . 31

– 4 – IEC 61225:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS – INSTRUMENTATION, CONTROL AND
ELECTRICAL POWER SYSTEMS – REQUIREMENTS FOR STATIC
UNINTERRUPTIBLE DC AND AC POWER SUPPLY SYSTEMS

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical 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 Specification
...

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