IEEE 946 : 2004

DESIGN OF DC AUXILIARY SYSTEMS FOR GENERATING SYSTEMS

Institute of Electrical & Electronics Engineers

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1 Overview
  1.1 Scope
2 Normative references
3 Definitions
4 General
  4.1 Description and operation
  4.2 Number of batteries
  4.3 Number of chargers and distribution panels
  4.4 System voltage and battery size considerations
  4.5 Physical layout
5 Batteries
  5.1 General description
  5.2 Determination of battery duty cycles and battery size
      (capacity)
  5.3 Installation design
  5.4 Maintenance, testing, and replacement
  5.5 Qualification
6 Battery chargers
  6.1 General description
  6.2 Determination of rated output
  6.3 Sample calculations
  6.4 Installation Design
  6.5 Output characteristics
7 Distribution system and equipment
  7.1 Protective device description and rating
  7.2 Typical diagram
  7.3 Voltage ratings for dc powered components
  7.4 Instrumentation, controls, and alarms
  7.5 Special dc loads
  7.6 Design features to assist in battery testing
  7.7 Cross-tie between buses
  7.8 Qualification
  7.9 Available short-circuit current
8 Spare equipment
Annex A (informative) Bibliography
Annex B (informative) Battery charger rating-sample calculations
      B.1 Introduction
      B.2 Formulas
      B.3 Sample calculations
Annex C (informative) Batteries, available short-circuit
        current-sample calculations
      C.1 Introduction
      C.2 Discussion
      C.3 Sample calculations
Annex D (informative) Effect of grounds on the operation of dc
        auxiliary power systems
      D.1 Introduction
      D.2 Discussion
      D.3 Sample evaluations
Annex E (informative) Battery charger, short-circuit current
        contribution
      E.1 Abstract
      E.2 Discussion
      E.3 Sample evaluation

Abstract

Presents guidance for the design of the dc auxiliary power systems for nuclear and non-nuclear power generating stations. 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.