The comparison
between Direct ON Line Starter and Star Delta Starter is given as below.
Sr.No
|
||
1
|
The control
circuit consists of three contactors. ( 1 ) Main connection ( 2 ) Star
connection ( 3 ) Delta connection. The rating of the star contactor should be
1 / √ 3 times that of main / delta contactor rating.
|
|
2
|
Each winding
gets rated line voltage.
|
Each winding
gets only 58% of the rated line voltage.
|
3
|
The starting
current is 5 to 6 times as that of full load current
|
The starting
current is 1/3rd that of in the Direct ON line starter.
|
4
|
The three
winding is generally connected in the star.
|
The three
winding is connected first in the star at the time of starting then delta at
the time of running condition.
|
5
|
The starting torque is 1.5 to 3.0 times that of full load torque.
|
The starting torque is reduced 1/3th that of in the Direct ON line starter. The star delta starter is equivalent to auto transformer with 57.7% tapping.
|
6
|
The Direct ON Line Starter is used where high starting torque requires
|
The Star delta starter is not used where high starting torque is required.
|
7
|
Only one
contactor operates for entire operation.
|
First main and
star contactor operates, then main and delta contactor operates.
|
8
|
Only three
wires are brought out from the motor terminals
|
There are six
wires are brought out from the motor terminals
|
9
|
Application :
up to 5 HP motor
|
Application :
up to 10 HP motor
|
10
|
Compact size
|
Large space
requires
|
11
|
Low cost
|
High cost
|
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