Paper Title
Switching Study On High Voltage Efficient Motor
Abstract
High Voltage Motors are a vital
component of the energy conversion process for
electric utilities. These are used to drive water
pumps, feed pumps in super thermal power
stations, marine loading terminals, off-shore gas
platform and many other high voltage high power
applications. Most motors experience surges with
magnitudes 6 to 8 pu and rise times 0.2 to 0.6 µs.
Grounding of the motor supply cable shield on one
end (preferably motor end) can minimize the
severity of switching surges seen at the motor
terminals. The risetimes and magnitudes of surges
produced by vacuum and air-magnetic switchgear
are similar. However, vacuum switchgear produce
multiple surges in each operation. Inadequate
quality control appears to be the real cause for low
surge strength of poor motors. The grounding of
the shielding ends of XLPE cable play important
role in addition to protecting devices such as
capacitor, resistor and ZnO-Varistor.
Index terms— Switching Surges, Transients, High
Voltage Motors, ZnO-Varistor, Shielding Ends of
XLPE cable