Lucent Technologies Lineage
®
2000 50A -48V 364A-3 SR Series Rectifier
Issue 6 January 1997 Engineering and Ordering 3 - 9
non-redundant and redundant battery plants. Mixing rectifiers of
different output current capacities in the same plant is also
discussed.
Non-Redundant
Systems
In non-redundant systems, the minimum installed rectifier
capacity of the battery plant must provide the current required
for the load during normal operations and must also provide the
current required to recharge the battery following ac power
outages.
For the telecommunications industry the system load current is
known as the average busy-hour current. (The average
busy-hour current drain is defined as the average busy-hour
current drain during busy season with the plant operating at the
normal voltage.) Therefore, the minimum installed rectifier
capacity (mirc) is the sum of the average busy-hour current (abh)
and the required battery recharge current, or:
mirc = abh + recharge current
The battery recharge current is determined by two system
considerations, the maximum time the system is required to
operate in the absence of ac power (reserve time) and the
minimum time allocated to recharge the battery after ac power
returns. These two times and the battery data shown in Figure
3-2 may be used to determine the recharge factor. This
factor, when multiplied by the average busy-hour current,
determines the minimum installed rectifier capacity, or:
mirc = abh x recharge factor
The mirc divided by the individual rectifier capacity determines
the number of rectifiers (of equal capacity) required for a
non-redundant system.
Redundant
Systems
In redundant systems, a spare on-line rectifier is included so that
the loss of any one rectifier will not cause the available plant
capacity to fall below the required minimum installed rectifier
capacity. Thus, the loss of a rectifier will not affect the normal
system operation nor will it cause the batteries to discharge.
In cases where the additional spare rectifier will provide the
required battery recharge current, the mirc satisfies the
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