This recommended practice provides guidance for the design of stationary dc power systems and their associated passive or active protection. General principles of coordination of protective devices for selective tripping are discussed. The components of the stationary dc power system addressed by this recommended practice include: - Storage batteries - Static battery chargers/rectifiers (including sizing) - Distribution equipment - Protection equipment - Control equipment - Interconnections - Instrumentation For applications such as uninterruptible power supply systems (UPS), only protection is included. Guidance is also provided for selecting the quantity, types and ratings of equipment. The considerations of each of these different components and the issue of load voltage and other load specifics are discussed in terms of their effect on the design of the whole system. Guidance on short-circuit calculation and contribution of different dc power system components is also offered to improve reliability, performance and safety of the installation. The following applications are not covered by this standard: Electrically self-contained ac-ac equipment and the following components of the dc power system, with the exception of how they influence the dc power system design, are specifically excluded from the scope of this recommended practice: - The ac power supply to the battery chargers/rectifiers - Sizing of photovoltaic, wind, and other alternative power systems - Loads served by dedicated engine starting battery systems - Applications requiring dc voltage supply above 2000 V nominal - Motor generator sets - Internal protection used in certain battery systems. For example: a self-contained protection system that may be incorporated within the battery pack. Separate systems are usually recommended for the following special service applications, and are not within the scope of this document: - Engine (cranking) starting - Emergency lighting - Fire detection and annunciation - Fire protection actuation
- Sponsor Committee
- PE/ESSB - Energy Storage & Stationary Battery Committee
Learn More About PE/ESSB - Energy Storage & Stationary Battery Committee - Status
- Active PAR
- PAR Approval
- 2022-09-21
- Superseding
- 946-2020
Working Group Details
- Society
- IEEE Power and Energy Society
Learn More About IEEE Power and Energy Society - Sponsor Committee
- PE/ESSB - Energy Storage & Stationary Battery Committee
Learn More About PE/ESSB - Energy Storage & Stationary Battery Committee - Working Group
-
WG_946 - DC System Design Working Group
- IEEE Program Manager
- Michael Kipness
Contact Michael Kipness - Working Group Chair
- Haissam Nasrat
Other Activities From This Working Group
Current projects that have been authorized by the IEEE SA Standards Board to develop a standard.
No Active Projects
Standards approved by the IEEE SA Standards Board that are within the 10-year lifecycle.
946-2020
IEEE Recommended Practice for the Design of DC Power Systems for Stationary Applications
Recommended practices for the design of dc power systems for stationary applications are provided in this document. The components of the dc power system addressed by this document include lead-acid and nickel-cadmium storage batteries, static battery chargers, and distribution equipment. Guidance in selecting the quantity and types of equipment, the equipment ratings, interconnections, instrumentation and protection is also provided. This recommendation is applicable for power generation, substation, and telecommunication applications.
These standards have been replaced with a revised version of the standard, or by a compilation of the original active standard and all its existing amendments, corrigenda, and errata.
946-2004
IEEE Recommended Practice for the Design of DC Auxiliary Power Systems for Generating Systems
Revision of IEEE Std 946-1992. Guidance for the design of the DC auxiliary power systems for nuclear and non-nuclear power generating stations is provided by this recommended practice. The components of the DC auxiliary power system addressed by this recommended practice include lead-acid storage batteries, static battery chargers, and distribution equipment. Guidance for selecting the quantity and types of equipment, the equipment ratings, interconnections, instrumentation, control and protection is also provided.
These standards have been removed from active status through a ballot where the standard is made inactive as a consensus decision of a balloting group.
No Inactive-Withdrawn Standards
These standards are removed from active status through an administrative process for standards that have not undergone a revision process within 10 years.
No Inactive-Reserved Standards