What is the d/f between DOL & star delta starter & automatic
star delta starter?
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Answer Posted / ankur mishra(moradabad)
In DOL starter full line voltage is fed to motor which will
start motor with a shock, it also draws very high current
than rated current(around 6 times), but if we use star-
delta starter , the motor starts as a star connection later
which is converted in to delta.
using star connection the line voltage is devided in two
phase voltages, also impedence is also increased due to two
star windings which result in low starting current and low
torque which will prevent motor to run with shock.
another difference is DOL starting takes less time while
star-delta takes more time to run at rated speed.
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