What is the d/f between DOL & star delta starter & automatic
star delta starter?
Answer Posted / honey
in induction motor the torque is propotional to squre of
supply voltage in case of dol the motor directly connected
to supply so torque is more while in star delta the motor
is firstly connected to star hence voltage is reduced
torque will be less and when motor reaches its 80% of speed
it connects with delta with the help of timer then full
voltage is supplied hence less rating motor should be
started with dol but for high rating it should be with star
delta
Is This Answer Correct ? | 58 Yes | 8 No |
Post New Answer View All Answers
What is a Phase shift meter? Where can I get one?
we are having 110 Kv,250mA Electrostatic precipitators for coal fired boilers. what will be static voltage and current after discharge and what time it will remain before earthing?
In a voltage-controlled current source A A current booster is never used B The load is always floated C A stiff current source drives the load D The load current equals Isc
what is the use of the circle diagram
what is self capacitance of inductor
What consists of 2 or more thermocouples to be connented series?
What is main cause of cable's terminal point burned in Lug on high temperature although lug and cable selection is ok as per stantard and also tightness is ok as per situation. so please take in deep and tell correct answer thanku.
what is the purpose of slope in the differential relay?why we are using two slope?but in busbar differential we are using only one slope.why?
what is meant by skew width in machines?
Discribe type of fault in DOL and stardelta startor.
I have doubt that the supply HZ (very low or high than rated ) may affect the power factor. is it true. ?
What is the use of bundle conductors?
Why we are going for converter transformers for DC drives application instead of distribution transformer?
For a spring controlled governer the relation F = ar+b (F is the controlling force, r is the radius of rotation a and b are constants), indicates that the governer is
what is earthing.how we make it,describe briefly.