Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
Issue 13 December 2000 Engineering and Ordering 3 - 1
3 Engineering and Ordering
Engineering Information
Introduction This section discusses the factors to be considered in determining the
number of rectifiers required in both non-redundant and redundant
battery plants.
Rectifier Sizing
(Non-Redundant
Systems)
In non-redundant systems, the installed rectifier capacity of the battery
plant must be sufficient to provide the current required for the load
during normal operations as well as 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
(abh) current 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 time allocated to
recharge the battery after ac power returns. These two times and Figure
3-1 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.
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