IEC SRD 63317:2025
(Main)Low-voltage direct current (LVDC) industry applications
Low-voltage direct current (LVDC) industry applications
IEC SRD 63317:2025 which is a systems reference deliverable describes certain aspects of standardization of LVDC in industrial applications. These industrial applications apply to the secondary economic sector where the processing of resources obtains to the production, distribution and storage of physical goods, especially in a factory or special area. This document covers the generation, distribution and consumption of LVDC power at these premises. This document follows the IEC Systems Approach from the domain to the gap analysis and give guidance by describing reference implementation.
General Information
Standards Content (Sample)
IEC SRD 63317 ®
Edition 1.0 2025-10
SYSTEMS REFERENCE
DELIVERABLE
Low-voltage direct current (LVDC) industry applications
ICS 29.020 ISBN 978-2-8327-0711-1
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CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 State of the art . 9
4.1 Today's structures for power supply . 9
4.2 Auxiliary energy . 9
5 Domain description and analysis . 10
5.1 General . 10
5.2 Typical drivers . 11
6 Description of system architectures . 12
6.1 System architectures (Stage 2 – System Architecting) . 12
6.2 Technical challenges to overcome . 13
7 Use cases (Stage 3 – Use Case Analysis) . 13
7.1 General . 13
7.2 Use case description of braking energy recuperation . 13
7.2.1 General. 13
7.2.2 Author information. 15
7.2.3 Scope and objectives of use cases . 15
7.2.4 Narrative of use cases . 16
7.2.5 Diagrams of use cases . 17
7.2.6 Use case conditions . 18
7.2.7 Commercialization rate and prevalence of use case . 18
7.2.8 Information of regulatory and standardization issues . 18
7.2.9 Actors . 19
7.2.10 Actors and their roles in the use case . 19
7.2.11 Overview of scenarios . 20
7.2.12 Further information. 20
7.2.13 Custom terminology, definitions and information. 20
7.2.14 References. 21
8 Aspects of DC systems for industrial usage (Stage 4 – System Modelling) . 21
8.1 Preconditions necessary to connect to a DC system . 21
8.2 Risks specific to direct current . 21
8.3 Topologies for DC grids . 22
8.4 Network and earthing configuration . 22
8.5 Electromagnetic compatibility (EMC). 23
8.6 Grid behaviour . 23
8.6.1 Voltage bands . 23
8.6.2 Pre-charging . 23
8.6.3 Short-circuit behaviour . 23
8.6.4 Grid management or power flow control . 24
8.7 System stability . 24
8.8 Protection for safety . 24
8.8.1 General. 24
8.8.2 Overcurrent . 25
8.8.3 Protection against transient overvoltages . 25
8.8.4 Arc faults . 25
8.8.5 Protection against voltages during maintenance . 26
8.8.6 Corrosion protection . 26
8.8.7 Insulation coordination . 27
8.8.8 Protection against electric shock . 27
9 Standard analysis (Stage 5 – Standards Analysis) . 27
9.1 Survey of existing standards . 27
10 Gap analysis (Stage 6 – Gap Analysis) . 27
10.1 Survey of additional standardization needs . 27
10.2 Mapping of aspects to standardization needs. 28
Annex A (informative) Industrial examples. 29
A.1 DC-INDUSTRIE project in Germany . 29
A.1.1 General. 29
A.1.2 Voltage bands . 29
A.1.3 Operating statuses as function of voltage and time . 30
A.1.4 Droop curves . 32
A.2 Comparison of earthing concepts . 33
A.2.1 Earthing via the AC grid . 33
A.2.2 DC IT system without continued operation (DC IT system) . 34
A.2.3 DC mid-point earthing. 37
Bibliography . 38
Figure 1 – Variants for auxiliary power supply [3] . 10
Figure 2 – SGAM framework . 11
Figure 3 – Overview of an industrial DC system . 12
Figure 4 – IEC SRD 63200 descriptions of domains and zones as well as layers . 14
Figure 5 – Relevant stability considerations . 24
Figure A.1 – Operating ranges of the components of the DC system . 30
Figure A.2 – Exemplary droop curves of different power sources with active voltage
control . 32
Figure A.3 – Definition of direction of voltage u and current i . 32
DC DC
Figure A.4 – DC IT system with producers, storage units and loads [3] . 35
Figure A.5 – Active balancing in the DC-IT grid [3] . 36
Table 1 – Use case identification. 14
Table 2 – Information of contributing author(s) and versions of the descriptions . 15
Table 3 – Use case 001 Recuperation of braking energy . 15
Table 4 – Narrative of use case . 16
Table 5 – Diagram(s) of use case . 17
Table 6 – Use case conditions . 18
Table 7 – Commercialization rate and prevalence of use case . 18
Table 8 – Information of regulatory and standardization issues. 18
Table 9 – Actor grouping . 19
Table 10 – Actors and their roles in the use case . 19
Table 11 – Overview of scenarios . 20
Table 12 – Further information for classification and interconnections mapping . 20
(*
Table 13 – Custom terminology, definitions and information . 20
Table 14 – References . 21
Table A.1 – Operating status as a function of voltage and time. 31
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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Low-voltage direct current (LVDC) industry applications
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