Lucent Technologies Lineage
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2000 200A Ferroresonant Rectifier J85503B-2
Issue 8 January 1999
Engineering and Ordering 3 - 1
3
Engineering and Ordering
Rectifier Sizing
This section discusses how to determine the minimum number
of rectifiers required in a battery plant. Rectifiers of different
output current capacities can be paralleled in a plant; therefore,
size mixing is also discussed.
Sizing
Considerations
Any time the plant load exceeds the combined capacity of the
rectifiers, the batteries, which are in parallel, must discharge in
order to supply the additional current demand. Momentary
discharges are handled easily by the batteries; in fact, this
capability precludes the need for the rectifiers to handle
infrequent, momentary peak current conditions. However, the
total rectifier capacity of the plant must be designed to meet
prolonged periods of current drain during “busy” demand times.
In a telecommunications environment, this is known as the
“average busy hour” (abh) current drain. It is defined as the
average busy hour of busy season current drain drawn at normal
plant operating voltage.
Other parameters which the customer must decide are the
maximum length of time the batteries are allowed to discharge
(reserve time), and the amount of time allowed for recharge of
the batteries (recharge time). These two times are used in
determining the “recharge factor” from battery data similar to
that shown in Figure 3-1. The recharge factor determines the
amount of current required, over and above the load demand, to
recharge the batteries concurrently with supplying the abh load
demand.
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