What is the d/f between DOL & star delta starter & automatic
star delta starter?
- 23 Answers
- 158045 Views
- ACC, Dalkia, Engineering, Indeco, NINL, Novotel, RMH Control Systems, Wipro, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / ponnu(the elite)
DOL STARTER MEANS DIRECT ON LINE STARTER WHICH IS USED 2
CONTROLS THE OVER LOADS BUT IN STAR-DELTA STARTER,FIRST WE
WILL CONNECT THE SUPPLY TO STAR.WHEN THE 80% RATED SPEED
OBTAINED,WE WILL CONNETED THE TERMINALS TO DELTA CONNECTION.
| Is This Answer Correct ? | 15 Yes | 6 No |
Answer / prashant
DOL STARTER IS DIRECT ON LINE STATER THIS IS ONLY FOER OVER LOAD PROTECTION BUT THE STAR DELTA STARTER IS MOTOR PROTECTION THAT IS IN START IN STAR WHEN INITIAL LOADING IS DONE THEN IN DELTA.
| Is This Answer Correct ? | 15 Yes | 9 No |
When the motor is connected in Delta and started by DOL method, the voltage applied across a coil is the voltage between two phases i.e, 415V approx. Therefore the current inrush is high. In order to minimize the starting current, voltage across the coils should be brought low, which can be done if we connect the coils in star. During star connection the voltage across a coil is 240V (approx) which is 1/(sq root of 3)times that in delta which results in a simultaneous lowering of current also. This eases the stress on relays and conductors.When the motor attains 90% of its rated speed the coils are connected in Delta. therefore generating higher power.
| Is This Answer Correct ? | 5 Yes | 3 No |
Answer / h.l.kiran
in DOL we are going to connect 3 phase supply directly but
it will capable for less current if more current flows
through it the starter will get damage. while starting the
motor it will take more current, for reducing this start up
current we r going to star-delta connection. in this first
will be in star conection after that it will turn to delta
connection.
| Is This Answer Correct ? | 6 Yes | 5 No |
Answer / bheem reddy bhanu teja reddy
the voltages are reduced in dol and we can use it a proper
manner the lines are connected directly to the motor but in
star delta the voltage is step downed
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / bhavin makwana
the d.o.l is 0-5H.P MOTOR,AND STRE DELTA STRTER IS USE
ABOVE 5H.P MOTOR.
THE DOL IS CONNECTED TO DIRECT TO LINE.
THE STARE DELTA IS DO NOT CONNECTED TO LINE USE.
IN AUTOMATIC STARE DELTA STATER IS NO CHANGE OVER SWITCH
THEY CHANGE BY AFTER SOME TIME BY TIMER CKT.
IN STARE DELTA STRTER INITIALLY MOTOR STARTE IN STARE AFTER
SOME TIME THEY RUN IN DELTA.
SOME TEXT.....
| Is This Answer Correct ? | 4 Yes | 4 No |
Answer / varun machal
in case of dol starter the motor terminals directly to the power supply. & case of star delta the potential speed of motor starts in slowly
| Is This Answer Correct ? | 3 Yes | 3 No |
Answer / sanjeev
in dol starter starting torque is high.which is on light load.it is connectrd direct to line and used below 5hp.
in star-delta starter starting torque is 60% and it reduced to 1/3and its then connected to delta.this starter is used above 5hp.
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / bhavin
star delta ::This is a starting method that reduces the starting current
and starting torque. The components normally consist of three
contactors, an overload relay and a timer for setting the time in
the star-position (starting position). The motor must be delta
connected during a normal run, in order to be able to use this
starting method
dol :: this is also a starting method but some what dangerous for heavy motor who can carry heavy load. because this processes fed direct current to the motor.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / dhinesh cipet
=>dol starte the motor is directly fed from the line and
=>star delta starter ther motor is started initially from
star and later during running from delta
| Is This Answer Correct ? | 6 Yes | 7 No |
how to reduce the magnetizing current in distribution transformers
what are the problems that generally occur in power flows??
What about electrical Units. discrive in detail
difference between Ac and Dc mcb ????
sir, plz tell me how much kvar capacitor required for 1000 amp or 500 Kw load ? what is the formula ?
Explain role of Buckolz Relay in Transformer ?
why u r living from presentaly working.
why earth hole size is biggest in plug point?
22 Answers Al Qabas, HCL, RRB,
explain remenance . differentiate high remenance type ct & low remenance type ct
sir i completed apprentice in TNEB.apprentice is eligible for 'c' licence
0 Answers Bhel, TNEB Tamil Nadu Electricity Board,
I have 500A load (WHICH IS SEPARATE MDP PANEL),an MCC panel with 4000A Breaker.Already I have 2500A load.Can I connect this load directly to the Busbar since I have PROTECTION IN MY MDP Panel ?
At what factor resistance r of a conductor depends?
-
Civil Engineering (5085) - Mechanical Engineering (4451)
- Electrical Engineering (16632)
- Electronics Communications (3918)
- Chemical Engineering (1095)
- Aeronautical Engineering (239)
- Bio Engineering (96)
- Metallurgy (361)
- Industrial Engineering (259)
- Instrumentation (3014)
- Automobile Engineering (332)
- Mechatronics Engineering (97)
- Marine Engineering (124)
- Power Plant Engineering (172)
- Textile Engineering (575)
- Production Engineering (25)
- Satellite Systems Engineering (106)
- Engineering AllOther (1379)
