Lucent Technologies H569-420, Руководство по эксплуатации продукта

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Lucent Technologies ECS Minicell Battery Plant H569-420
Issue 5 February 1997 Engineering and Ordering 3 - 1
3 Engineering and Ordering
Sizing a Plant
When ordering a battery plant, the engineer must determine
whether the plant is to be redundant or not. The following
sections describe both non-redundant and redundant systems.
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 operation 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. Therefore, the
minimum installed rectifier capacity (mirc) is the sum of the
average busy-hour current (abh) and the required battery
recharge current.
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
requirements for both non-redundant and redundant systems. In