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GB/T 14546-2025 English PDF

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GB/T 14546-2025: Practice for the design of DC auxiliary power system for nuclear power plants
Status: Valid

GB/T 14546: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 14546-2025English679 Add to Cart 5 days [Need to translate] Practice for the design of DC auxiliary power system for nuclear power plants Valid GB/T 14546-2025
GB/T 14546-2008English529 Add to Cart 4 days [Need to translate] Recommended practice for the design of DC auxiliary power system for nuclear power stations Valid GB/T 14546-2008
GB/T 14546-1993English519 Add to Cart 4 days [Need to translate] Criteria for the design of safety-related DC auxiliary power systems for nuclear power plants Obsolete GB/T 14546-1993

Basic data

Standard ID GB/T 14546-2025 (GB/T14546-2025)
Description (Translated English) Practice for the design of DC auxiliary power system for nuclear power plants
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard F83
Classification of International Standard 27.120.20
Word Count Estimation 34,349
Date of Issue 2025-08-01
Date of Implementation 2026-02-01
Older Standard (superseded by this standard) GB/T 14546-2008
Issuing agency(ies) State Administration for Market Regulation, Standardization Administration of China

GB/T 14546-2025: Practice for the design of DC auxiliary power system for nuclear power plants

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14546-2025
ICS 27.120.20 CCSF83 National Standard of the People's Republic of China Replaces GB/T 14546-2008 Design and Implementation Methods of DC Power Systems in Nuclear Power Plants Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 System Design 2 5 Batteries 3 6 Battery Charger 6 7 Power Distribution System 9 8 DC power system instrumentation, control and alarm 15 9 Electrical noise, lightning and switching overvoltage protection 19 10 Spare parts 19 Appendix A (Informative) Charger Load Current Distribution 20 Appendix B (Informative) Battery Charger Capacity Calculation Example 21 Appendix C (Informative) Example of Calculating Short-Circuit Current of a Battery 22 Appendix D (Informative) Battery Charger and DC Power System Short Circuit Current 25 Appendix E (Informative) Abnormal Grounding Effects on Operating DC Power Systems 27 Reference 29 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 14546-2008 "Recommended Practice for Design of DC Power Systems in Nuclear Power Plants" and is in compliance with GB/T 14546-2008. In addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Changed the battery working cycle, battery maintenance and test requirements (see Chapter 5, Chapter 5 of the.2008 edition); --- Added relevant requirements for battery expansion and modification and some installation design requirements (see 6.2); --- Changed the calculation method of battery charger capacity (see 6.4, 6.2 of the.2008 edition); --- Changed the requirements for battery charger output characteristics (see 6.7, 6.4 of the.2008 edition); --- Changed the typical connection mode of DC power system (see 7.1, 7.2 of the.2008 edition); --- Changed the description of factors affecting the short-circuit current of batteries and chargers (see 7.3, 7.8 of the.2008 edition); --- Added the delay setting requirements for busbar low voltage alarm (see 8.3); --- Added relevant requirements for electromagnetic interference and lightning overvoltage protection (see Chapter 9). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee for Standardization of Nuclear Instruments (SAC/TC30). This document was drafted by. Shanghai Nuclear Engineering Research and Design Institute Co., Ltd., East China Electric Power Design Institute Co., Ltd. of China Electric Power Engineering Consulting Group Limited Company. The main drafters of this document are. Gu Shenjie, Ni Dan, Jiang Songfang, Ye Yongjian, Huang Dongyan, Sun Hao, Lu Yanyun, Zhang Yi, Wang Sicong, Liu Xin, Wei Yuning and Li Xin. The previous versions of this document and the documents it replaces are as follows. --- First published as GB/T 14546-1993 in.1993, first revised in.2008; ---This is the second revision. Design and Implementation Methods of DC Power Systems in Nuclear Power Plants

1 Scope

This document specifies the implementation method for the design of DC power systems for nuclear power plants. This document applies to the design of lead-acid batteries, static charging devices and DC power distribution equipment for DC power systems, including the number of equipment and type selection; determination of equipment ratings; interconnection; selection of instrumentation, control and protection, etc. This document does not apply to AC power supplies for charging devices and loads supplied by DC power systems (unless they affect the DC power system). design), nor is it suitable for locomotive-specific starting battery systems. If the following special application scenarios have independent batteries or uninterruptible power supply systems, they are not within the scope of this document. a) Engine (starting); b) emergency lighting; c) fire detection and alarm; d) Fire drive.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 3859 (all parts) General requirements for semiconductor converters and grid-commutated converters GB/T 12727 Identification of electrical equipment important to safety in nuclear power plants GB/T 13286 Criteria for the independence of safety-related electrical equipment and circuits in nuclear power plants GB/T 15473 Quality Appraisal of Safety-Grade Static Charging Devices and Inverter Devices for Nuclear Power Plants GB 50217 Design Standard for Power Engineering Cables NB/T.20028.1 Batteries for nuclear power plants Part 1.Capacity determination NB/T.20028.2 Batteries for nuclear power plants Part 2.Installation design and installation guidelines NB/T.20028.4 Batteries for nuclear power plants Part 4.Maintenance, testing and replacement methods NB/T.20080 Qualification of Safety-Grade Vented Lead-Acid Batteries for Nuclear Power Plants NB/T 20420 Identification of safety-grade cables and connectors for nuclear power plants

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 battery capacitybatterycapacity The usable ampere-hour capacity of the installed battery measured by test. 3.2 battery chargerbatterycharger Converts AC power into DC power, charges the battery and keeps it fully charged, and provides power to DC loads during normal operation.

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