1.3.4
Transient Response
The engine-generator set governor and voltage regulator shall cause the
engine-generator set to respond to the maximum step load changes such that
output voltage and frequency recover to and stabilize within the
operational bandwidth within the transient recovery time. The
engine-generator set shall respond to maximum step load changes such that
the maximum voltage and frequency deviations from bandwidth are not
exceeded.
1.3.5
Reliability and Durability
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NOTE: Mean time between overhauls describes the
average number of operating hours that the engine
will operate satisfactorily without overhaul.
Overhaul is a natural consequence of the engine in
operation due to worn out parts after the indicated
operating hours.
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[Each prime engine-generator set shall have both an engine and a generator
capable of delivering the specified power on a prime basis with an
anticipated mean time between overhauls of not less than 10,000 hours
operating with a 70% load factor. Two like engines and two like generators
shall be cited that have performed satisfactorily in a stationary power
plant, independent from the physical location of the manufacturer's and
assembler's facilities. The engine and generators should have been in
operation for a minimum of 8000 actual hours at a minimum load of 70% of
the rated output capacity. During two consecutive years of service, the
units should not have experienced any failure resulting in a downtime in
excess of 72 hours. Like engines shall be of the same model, speed, bore,
stroke, number and configuration of cylinders and rated output capacity.
Like generators shall be of the same model, speed, pitch, cooling, exciter,
voltage regulator and rated output capacity.] [Each standby
engine-generator set shall have both an engine and a generator capable of
delivering the specified power on a standby basis with an anticipated mean
time between overhauls of no less than 5,000 hours operating with a load
factor of 70%. Two like engines and two like generators shall be cited
that have performed satisfactorily in a stationary power plant, independent
and separate from the physical location of the manufacturer's and
assembler's facilities, for standby without any failure to start, including
all periodic exercise. Each like engine and generator shall have had no
failures resulting in downtime for repairs in excess of 72 hours during two
consecutive years of service. Like engines shall be of the same model,
speed, bore, stroke, number and configuration of cylinders, and rated
output capacity. Like generators shall be of the same model, speed, pitch,
cooling, exciter, voltage regulator and rated output capacity.]
1.4
GENERAL REQUIREMENTS
1.4.1
Engine-Generator Set
Each set shall consist of one engine, one generator, and one exciter
mounted, assembled, and aligned on one base; and other necessary ancillary
equipment which may be mounted separately. Sets having a capacity of 750
kW or smaller shall be assembled and attached to the base prior to
shipping. Sets over 750 kW capacity may be shipped in sections. Each set
SECTION 16263A
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