IEEE 946:2020 pdf download.IEEE Recommended Practice for the Design of DC Power Systems for Stationary Applications.
This recommended practice provides guidance for the design of stationary dc power systems. The components of the stationary dc power system addressed by this recommended practice include the following:
— Storage batteries
— Static battery chargers/rectifiers (including sizing)
— Distribution equipment
Protection equipment
Control equipment
Interconnections
Instrumentation
Guidance for selecting the quantity, types. and ratings of equipment is also provided.
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.
1.2 Purpose
The purpose of this document is to provide the user with information and recommendations concerning sizing and designing dc power systems in stationary applications.
While the recommended practices in this document apply to dc power systems in substations, additional guidance fbr substations is provided in IEEE Std 1818.
1.3 Exclusions
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
Photovoltaic, wind, and other alternative dc power source system designs
Loads served by dedicated engine starting battery systems
Applications requiring dc voltage supply above 1000 V nominal
Motor generator sets
Battery technologies other than lead-acid (L-A) and nickel-cadmium (Ni-Cd)
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
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEEE Std 308, IEEE Standard Criteria for Class 1 E Power Systems for Nuclear Power Generating Stations.
IEEE Std 344, IEEE Standard for Seismic Qualification of Equipment for Nuclear Power Generating Stations.
IEEE Std 450TM, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead- Acid Batteries for Stationary Applications.
IEEE Std 484TM, IEEE Recommended Practice for Installation Design and Installation of Vented Lead-Acid Storage Batteries for Stationary Applications.
IEEE Std 485, IEEE Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications.
IEEE Std 649T, IEEE Standard for Qualifying Class 1 E Motor Control Centers for Nuclear Power Generating Stations.IEEE 946 pdf download.