265Section 14 Load ManagementTP-6953 7/19
14.5.4 Generator Capacity Load Add
Generator Capacity Load Add uses the percent loading
of the generator system and the Genset Maximum
Percent Capacity to compute an Available Capacity.
The percent loading of the generator system is taking
from the generator metering in a single-generator
application and from the total bus percent loading in a
paralleling application.
Available Capacity is compu ted a ccording to the
following formula:
Available Capacity = (Genset Maximum Percent
Capacity – Generator System % load)
TheexpectedkWforthenextloadishard-codedat15%,
so the reserve capacity is calculated as follows:
Reserve Capacity = (Available Capacity – 15)
The Add Accumulator fills at a rate that is dependent on
the Reserve Capacity and the Base Load Add Time
suchthatthetimetoaddapriorityisdefinedas:
TheBaseLoadAddTimesetstheaddtimeat25%
reserve capacity, while the timing increases with
additional reserve capacity (lower generator load).
Note: The add function is performed by an accumulator
and the timing is determined by the rate that the
accumulator fills, hence a varying load will fill the
accumulator at varying rates, causing the load to
add at a time that can’t be calculated directly with
the equation above, but can be estimated by it.
Figure 14 -11 Generator Capacity Load Add Timing With Default Configuration
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