Band (Percent) (+ or -)
<2.5
<1.5
<0.5
Steady-State Voltage
Regulation (Percent) (+ or -)
<5
<2.5
<1.0
**************************************************************************
The voltage and frequency behavior of the generator set shall be in
accordance with ISO 8528 operating limit values for performance Class[ G1][
G2][ G3][ G4 as follows].
2.1.1.4
Load Profile
The diesel engine-generator set shall be of adequate capacity necessary for
the following load profile:
[a.
Lighting [_____] kW]
[b.
Computer [_____] kW]
[c.
Uninterruptible power supplies (UPS) [_____] kVA,[ 3][ 6][ 12][ 24]
pulse]
[d.
Variable frequency drives (VFD) [_____] kVA,[ 3][ 6][ 12][ 24] pulse]
[e.
Motor starting sequence
Starting Size
Locked Rotor
Starting
Maximum
Order
(hp)
NEMA Code
Method
Voltage Dip
[_____]
[_____]
[F] [_____]
[Full Voltage] [_____]
[25] [_____] Percent
[_____]
[_____]
[F] [_____]
[Full Voltage] [_____]
[25] [_____] Percent
[_____]
[_____]
[F] [_____]
[Full Voltage] [_____]
[25] [_____] Percent]
[f.
Other load:
[_____] kW at 0.8 p.f.]
2.1.2
Diesel Engines and Accessories
**************************************************************************
NOTE: As of 8/98 major manufacturers are building
only four-cycle engines in order to meet Federal
emissions requirements. Two-cycle engines shall not
be specified.
**************************************************************************
ISO 3046. Diesel engines shall be four-cycle naturally aspirated, or
turbocharged, or turbocharged and intercooled; vertical in-line or vertical
Vee type; designed for stationary service. Engines shall be capable of
immediate acceleration from rest to normal speed without intermediate
idle/warm up period or prelubrication to provide essential electrical
power. Two-cycle engines are not acceptable.
2.1.2.1
Subbase Mounting
Mount each engine-generator set on a structural steel subbase sized to
support the engine, generator, and necessary accessories, auxiliaries and
control equipment to produce a complete self-contained unit as standard
with the manufacturer. Design the structural subbase to properly support
SECTION 16237N
Page 19
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