Lucent Technologies Lineage
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2000 50A -48V 364A-3 SR Series Rectifier
3 - 10 Engineering and Ordering Issue 6 January 1997
requirements for both non-redundant and redundant systems. In
other cases, rectifiers in addition to the redundant rectifier may
be required to provide the battery recharge current.
Plant
Configuration
Examples
To illustrate the relationships between mirc, abh current drains,
the recharge factor, and battery recharge current for
non-redundant and redundant systems, consider the following
examples.
1. A battery plant is required to provide an average busy-hour
load of 70 amperes, have an 8-hour discharge time (reserve
time) and recharge to 95% of battery capacity in 24 hours.
Determine the number of 50-ampere rectifiers required for
non-redundant and redundant systems.
From Figure 3-2, the recharge factor is 1.38.
mirc = abh x recharge factor
mirc = 70 x 1.38 = 96.6 amperes
Two 50-ampere rectifiers (96.6/50 = 1.9) are required to
provide the minimum installed capacity of 96.6 amperes
for a non-redundant system. If one rectifier fails, however,
the one remaining rectifier will not provide the abh
capacity. Therefore, one additional rectifier must be added
to complete a redundant system.
2. A battery plant is required to provide an average busy-hour
load of 350 amperes, have a 4-hour discharge time (reserve
time) and recharge to 95% of battery capacity in 24 hours.
Determine the number of 50-ampere rectifiers required for
non-redundant and redundant systems.
From Figure 3-2, the recharge factor is approximately 1.2.
mirc = abh x recharge factor
mirc = 350 x 1.2 = 420 amperes
Nine 50-ampere rectifiers (420/50 = 8.4) are required to
provide the minimum installed rectifier capacity of 420
amperes. In this example, seven rectifiers supply the abh
capacity and two additional rectifiers are required to
supply the battery recharge current. This system also meets
requirements for non-redundant and redundant systems.
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