Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
3 - 2 Engineering and Ordering
Issue 10 July 2000
Figure 3-1 illustrates some general bounds on sizing rectifiers for
recharging batteries. With other conditions fixed, it illustrates three
generalities.
•
As the reserve time of batteries increases, so does the recharge
factor required for a given recharge time.
•
Some minimum recharge factor is required to effectively recharge
the batteries.
•
Continuing to increase the recharge factor will not materially
reduce the recharge time.
Redundant and
Non-Redundant
Systems
The recharge factor (1.2 to 1.6) multiplied by the abh current drain gives
the minimum installed rectifier capacity (mirc) for any plant.
mirc = abh x recharge factor
The mirc is also the sum of the abh and the recharge current. For
example, a 1.2 recharge factor in a plant with an abh current drain of 100
amperes simultaneously allows 100 amperes for plant load, and 20
amperes for battery recharge in 24 hours, following a 3-hour discharge
period.
The mirc value of current is a requirement of either a redundant or a
non-redundant rectifier system. It is the only requirement defining a
non-redundant system. A redundant system additionally requires that
Figure 3-1: Recharge Time vs. Recharge Factor
1.0
12
16
20
24
28
32
36
40
44 48
Hours to 95% Charge
Recharge
Factor
1.1
1.2
1.3
1.4
1.5
1.6
3 4
Hours Reserve
5 6 7 8
