Compact medium and high voltage generators for data centers

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TECH N I C A L NOTE
Compact medium and high voltage
generators for data centers
Data centers are extremely
demanding in terms of the
reliability and quality of their power
supplies. High reliability and
excellent harmonic performance
make ABB’s compact medium and
high voltage generators for diesel
and gas engines an ideal solution
for standby power at data centers.
In some cases, these generators
are also being used for continuous
power at data centers.
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01 ABB compact
medium and high voltage
synchronous generators
offer maximum reliability
for data centers
Reliability and low harmonics
Reliability is essential for data centers, and for
maximum reliability ABB’s compact medium and
high voltage synchronous generators feature form
wound windings and vacuum pressure impregnation
(VPI) for both the stator and rotor. The advanced
VPI insulation system gives the windings added
strength to withstand vibration, and mechanical
and electrical stresses. Since the mid-1970s VPI has
proven itself in tens of thousands of generators
that are operating successfully all over the world.
High performance PMG excitation, supplied as
standard, further boosts reliability by ensuring
sufficient magnet power at power-up.
A key way to improve the quality of an electricity
supply is to reduce its harmonic content. As stan-
dard, ABB supplies the generators with a 5/6
winding pitch, which reduces the most significant
(5th and 7th) harmonics to minimal levels. At the same
time the 5/6 winding pitch increases the generators’
overall efficiency, which enables them to be built in
a smaller size for each given output level. ABB can
also supply generators with a 2/3 winding pitch for
cases where the neutral point is direct earthed.
This eliminates the 3rd harmonic.
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The generators are compact and easy to install.
The exciter and PMG are built in, and the main and
auxiliary terminals and AVR are all integrated.
An analog AVR is provided as standard, with ABB’s
advanced UNITROL® digital AVR available as an
option for optimal stability.
The open air cooled, 4- and 6-pole generators
are supplied in frame sizes 500 – 630. They cover the
power range 0.9 – 7.3 MVA at voltages of
3.3 – 13.8 kV, 50 and 60 Hz. The insulation is class H,
with utilization as class F in versions optimized for
continuous duty at data centers.
The cost-effective generators are pre-engineered,
enabling fast delivery. Their high efficiency reduces
fuel consumption for a low overall cost of
ownership.