Power Supply Mfg.
50hz.Test @1500KVA over
a voltage range of 323 to477V.
The internationally recognized
manufacturer of an innovative and revolutionary high tech electromechanical
replacement for DC battery banks used in large Uninterruptible Power
Systems sold in conjunction with and by Cat Standby Diesel Engine
Dealers needed a 1500KVA, 1200KW source to test his units at 50hz
over a range of 380V.+/-15%(323V.) to 415V+/-15%(477V) for overseas
Solution: The above 1500KVA unit features a synchronous motor at 1800RPM coupled to a synchronous generator at 1500RPM thru a gearbox and equipped with a 300hp pony motor directly coupled to the synchronous motor thru a shaft extension. This design incorporates several advantages:
- The use of the pony motor results in "no surge" starting--that
is, the unit never draws more current from the utility than it would
need when operating with a full load on the generator--even when starting
the 1875hp synchronous motor. In contrast, a wye-delta starter would
result in a 300% surge and that's guaranteed to dim anybody's, if not
- Starting Surge of 480V, 3ph., 60hz. Induction Pony Motor--1685A.
Total amperage reading on utility line when 1875 hp. Motor comes on
Total amperage on utility line when full 1500KVA 50hz load is on generator
--1847A @480V., 60hz.
Starting Surge of a normal wye-delta start 1875 hp Synch.Motor---5241A.
- The synchronous motor is equipped with a VAR/Power Factor Controller
which allows the operator to operate at 1.0 power factor automatically
at all times regardless of changing loads which means that the operating
cost of this test set is minimized at all times automatically with
no operator attention required. Even better, the unit can be adjusted
to act as a synchronous condenser, that is it can, in effect, feed
back reactive power into the building load and reduce the power factor
bringing the KVA(apparent power) closer to the KW(real usable power)
of the entire site. Some customers actually buy and run synchronous
motors on line with no load in place of capacitor banks for power
factor improvement. Of course, the higher the test load on the generator,
the less reactive power that can be fed back to the utility.
- This unit is equipped with our digital output meter with an RS485
output and software for test recording. When the unit is started,
a pushbutton results in a base printout of all parameters that is
time dated. At each load change, a timed printout can be generated
showing the various readings at that load and the length of time involved
to the next change etc.
- The unit is equipped with a PMG to provide "clean"(not affected
by the distortion fed back into the supply line by the test load)
operating power to the voltage regulator.
Click Image to Enlarge
(note height would be 79" if control panels were not mounted on the
Sound Level: 110 dB @ 3ft.
Dimension would be 30" shorter if panels were not skid mounted. Unit
is housed outdoors under an unheated roof and has coil heaters to
View All Problems