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10. REPLACEMENT STORAGE BATTERY SIZING
Sizing of a storage battery is generally based on three kinds of loads:
1. Power circuit breaker or circuit switcher tripping. This load is normally
of short duration and uses few ampere hours. When replacing a station
battery, the battery must have ample ampacity to handle this short term
load.
battery, the battery must have ample ampacity to handle this short term
load.
2. Normal battery loads that turn on automatically with loss of station power
must be calculated by multiplying load amperes times expected duration
and a rating factor. Typically, this rating factor would be 1, based on a 3-
hour discharge rate.
and a rating factor. Typically, this rating factor would be 1, based on a 3-
hour discharge rate.
3. Loads remaining after personnel have manually deleted all possible loads.
This battery load would normally be based on an 8-hour discharge rate
with a rating factor of 1.
The ampere-hour rating combining loads No. 2 and 3 normally is used to
size a station battery provided the short term ampacity is sufficient to handle
the load of No. 1.
Computer software is available from battery manufacturers at no cost to
simplify the sizing of different type batteries using IEEE methods.
simplify the sizing of different type batteries using IEEE methods.
11. STANDARDS
Additional information on batteries can be obtained from battery suppliers
and from IEEE standards as follows:
and from IEEE standards as follows:
IEEE 485-1983--
Recommended Practice for Sizing Large Lead Storage Batteries for
Generating Stations and Substations
*
*IEEE 450-1995--
Recommended Practice for Maintenance, Testing, and Replacement of
Vented Lead-Acid Batteries for Stationary Applications
IEEE 1184-1994--
Guide for Selection and Sizing of Batteries for Uninterruptable Power
Supply (UPS)
IEEE 1115-1992--
Recommended Practice for Sizing Nickel-Cadmium Batteries for
Stationary Applications
*IEEE 1106-1995--
Recommended Practice for Maintenance, Testing, and Replacement of
Nickel-Cadmium Batteries for Stationary Applications
IEEE 1189-1996--
Guide for Selection of Valve Regulated Lead-Acid Batteries (VRLA) for
Stationary Applications
*IEEE 1188-1996--
Recommended Practice for Maintenance, Testing, and Replacement of