MI L-DTL-53133/ 5B
a. Real power division. At no time shall difference between the average individual
kilowatt outputs of the set, when supplying the system load, be greater than 10
percent of the kilowatt rating of one set.
b. Power exchange. At all constant system loads up to the combined rating of the
sets in parallel, power exchange between the sets shall not exceed 20 percent
of the kilowatt rating on one set. Power exchange is the difference between
the maximum and minimum power output delivered by one set for constant
system load conditions, as determined from oscillographic measurements.
c. Reactive power division. At no time shall the difference in average reactive
kilovolt-ampere (kVA) supplied by any two set differ by more than 10 percent of
the reactive kVA rating on one set.
For the above requirements, the initial system load shall be equally divided between the
sets, both as to activate and reactivate components; thereafter, there shall be no
adjustments to governors, voltage regulators, or any other components as system load
is changed.
3.7 Frequency regulation. The governing system shall provide isochronous
operation of the set; i.e., (including rated load) the frequency regulation shall not
exceed 0.25 percent of rated frequency.
3.8 Frequency short-term stability (30 seconds). At every constant load from no
load to rated load, the system shall maintain frequency within a bandwidth equal to 0.5
percent of rated frequency. The system shall not permit repetitive frequency variations,
commonly called "hunting", even though within the allowable 0.5 percent band.
3.9 Frequency long-term stability (4 hours). At constant ambient temperature,
constant barometric pressure, constant voltage, and any constant load from no load to
rated load, the system shall maintain frequency within a bandwidth equal to 1 percent
of rated frequency in a 4-hour operation period.
3.10 Frequency drift. With the set operating at constant load and voltage, a change
in ambient temperature of up to 33 C° (60 F° ) in an 8-hour period shall not cause the
frequency to change by more than 0.5 percent, set temperature stabilization being
accomplished at both the initial and final ambient temperature conditions.
3.11 Frequency transient performance. Following a sudden increase or decrease in
load, up to and including rated load, the governing system shall re-establish stable
engine operating conditions within 2 seconds. The maximum transient frequency
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