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BS EN IEC 61225:2020

BS EN IEC 61225:2020

$167.15

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

Published By Publication Date Number of Pages
BSI 2020 40
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This document specifies the performance and the functional characteristics of the low voltage static uninterruptible power supply (SUPS) systems in a nuclear power plant and, for applicable parts, in general for nuclear facilities. An uninterruptible power supply is an electrical equipment which draws electrical energy from a source, stores it and maintains supply in a specified form by means inside the equipment to output terminals. A static uninterruptible power supply (SUPS) has no rotating parts to perform its functions.

The specific design requirements for the components of the power supply system are covered by IEC standards and standards listed in the normative references and are otherwise outside the scope of this document.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
13 1 Scope
2 Normative references
14 3 Terms and definitions
16 4 Abbreviated terms
5 System requirements
5.1 General
17 5.2 Function and description
5.2.1 Preamble
18 Figures
Figure 1 – System boundary
19 5.2.2 Designations
5.2.3 Direct current systems
5.2.4 Alternating current systems
20 5.3 System divisions
5.4 System boundaries
6 Functional requirements for static uninterruptible power supplies
6.1 Static uninterruptible power supplies for systems important to safety
21 6.2 Batteries and battery chargers
22 6.3 Inverters and bypass switches
23 6.4 UPS
6.5 Converters used for voltage stabilization
24 6.6 I&C power supply using DC/DC-converters and AC/DC-converters
7 Requirements for distribution systems
7.1 System aspects
7.2 Load allocation
25 Figure 2 – Example of one division of an uninterruptible power supply system
26 7.3 Electrical aspects
Figure 3 – Example of I&C uninterruptible AC power supply system
27 7.4 Earthing
8 Effects of loads on supply quality
8.1 General
8.2 Electromagnetic interference
8.3 Transients
28 8.4 Load current
8.5 Power supplies to loads of lower safety classification
9 Monitoring and protection
9.1 General
29 9.2 Monitoring
9.3 Electrical protection
30 10 Qualification of equipment
11 Design to cope with ageing
12 Testing
31 13 Maintenance
32 Annex A (informative) Examples of voltage input variations
Figure A.1 – Example of voltage variations on the on-site AC power systemduring clearing of a transmission system fault
Figure A.2 – Example of on-site voltage profile after loss of load(transfer to house load operation)
33 Figure A.3 – Example of simulated safety bus voltages, double openphase condition in the 400 kV line to the unit transformer
34 Annex B (informative)Examples of specifications
B.1 Example 1: Specification for an DC power supply for equipment requiring a non-interruptible supply
Tables
Table B.1 – Example 1
35 B.2 Example 2: Specification for AC power supply for equipment requiring a non-interruptible supply
Table B.2 – Example 2
36 B.3 Example 3: Specification for DC power supply with DC/DC converter for equipment
B.4 Human factor engineering programme
Table B.3 – Example 3
38 Bibliography

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BS EN IEC 61225:2020
$167.15