Normally the
starter used to
reduce the
starting
current.but the
dol starter do not
it,so why we use
it?
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Answer Posted / ionp
When DOL Starter is employed the motor is loaded with full
load voltage in starting, which causes high starting
current in the circuit.
Torque is proportional to square of Voltage so employing
DOL starter we achieve High Starting Torque. Which in turn
help Motor to attain its rated speed quickly.
Available Pull out Torque help load to accelerate quickly.
The starting current which can be 5 to 7 times of full load
current can be born by motor & Associated cables etc. for
few seconds during starting & does not causes any unwanted
heating & heat losses.
Hence we prefer DOL starters where high Starting Torque is
required.
On the contrary With Star-Delta starter Starting Voltage is
1/3rd of rated Voltage & Starting current is almost 3
times. This low voltage will cause insufficient torque in
starting & time taken to attain full load speed is more, in
turn more heating & losses. Also when Motor switches to
delta mode the current kick is almost 5 times the FLC, Thus
system is subjected to 2 current kicks.
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