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Question
what is different the DOL Starter and Star Delta STARTER
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
D.O.L Starter=Direct On Line Starter
1.It does not decrease the starting current.
2.It is cheap.
3.It connects directly the motor with supply for starting
as well as for running.
Star-Delta Starter
1.It decrease the starting current to 1/3 times.
2.It is costly.
3.It connects motor first in star at the time of starting
then in delta for running.
 
Is This Answer Correct ?    122 Yes 9 No
Natarajanramkumar
 
Answer
# 2
DOL is Direct on line starter, it is used upto 50 H.P Motors
Star delta starter is Starting time Motor Phases are in Star
and Running time it is convert to Delta scheme.( Because
High H.P Motors are Starting time we are appling Low voltage
by using Star system, and it is increase the Torque.)
 
Is This Answer Correct ?    136 Yes 59 No
Shankar Rao
 
 
 
Answer
# 3
in star/delta we can limit the current .but during starting
of motor in DOL motor will draw 3-5 time of its FLA
 
Is This Answer Correct ?    68 Yes 36 No
Shafiq
 
Answer
# 4
DOL-- As its meaning suggests "DIRECT ON LINE" the motors are provided the direct supply without any changes & this starters are only used for protection purpose (not for soft starting of the motor)and are preffered only upto 10 Hp motors in industries....

STAR DELTA--- are preffered beyond DOL range
first reduced voltage(1/3 of supply V) is given to the motor & as it reaches 70-80% of its rated speed full V is given. (it is the function of changing 4m star to delta)is done to reduce the starting current and to protect the motor.......

for any disagreement mail me at parmar20072008@yahoo.com
 
Is This Answer Correct ?    28 Yes 6 No
Sunil Guru
 
Answer
# 5
DOL MEANS DIRECT ON LINE STARETER WE CAN USE DOL UP TO 5KW
RATEING IT CONNECTED DIRECT TO THE SUPPLY THROUGH OVER
LOAD RELAY IT DOES NOT REDUSE THE STARTING CURRENT. star
delta are used havy rateing motors because it limits the
starting current in 1/3 tmes of starting current
 
Is This Answer Correct ?    24 Yes 4 No
Ramanjaneyulu
 
Answer
# 6
DOL MEANS DIRECT ON LINE STARETER WE CAN USE DOL UP TO 110
KW MOTORS SPECIALLY WHERE THE STARTING TOURQUE IS LOW AND
STARTING KICK IS ALSO SMALL. WHILE STAR DELTA IS DESIGN TO
REDUSE THE HIGH STARTING KICK. GENERALLY FANS BLOWER AND
COMPERSSOR MOTORS HAVE HIGH STARTING CURRENT DURING THE
STARTING SO IT IS GOOD TO USE STAR DELTA INSTEAD OF DOL.
ANOTHER DIFFERENCE IS THAT DOL HAS ONLY ONE CONTACTOR WHILE
STARDELTA HAS THREE CONTACTOR.
 
Is This Answer Correct ?    43 Yes 33 No
Rohan K Trivedi
 
Answer
# 7
DOL Starter :
This starter is costwise cheap. it doesnot reduce the
starting current of the motor. The starting current of the
DOL starter is 6 to 7 times of the full load current. We can
use this starter for any higher kW range motors also even
6400kW motor.(In my working place using this DOL starter for
this 6400kW motor.

Note: for any standard cannot mentioned this much of the kW
motors only use in this type of starter nu..

Star/Delta Starter :
This starter is costwise higher. It can reduce the
starting current of the motor. The starter current of the
star/delta starter is 3 to 5 times of the full load current.
Generally in my working place this starter can be use above
75kW motors.
 
Is This Answer Correct ?    19 Yes 14 No
J.karthik
 
Answer
# 8
the dol is direct online ie if press the start button it
start direct by closing the single contactor.and star-delta
starter is by redusing the volatge this will helps to
incrase the traque.
 
Is This Answer Correct ?    18 Yes 16 No
Mallikarjun
 
Answer
# 9
DOL is Direct on line starter, it is used upto 50 H.P Motors
star delta connects motor first in star at the time
ofstarting then in delta for running.
 
Is This Answer Correct ?    14 Yes 34 No
Nesalinpraju
 
Answer
# 10
I have seen in books that says DOL starters are used up to 50 hp(roughly 37 kw). In my project in singapore, 19 pumps of 160 kw are all start by DOL.(May not start all in one time). It is equal to 214 hp each. 
Is This Answer Correct ?    8 Yes 49 No
Pswin
 

 
 
 
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