Interested to Buy Any Domain ? << Click Here >> for more details...
why do we use star-delta starter. what is its need?
- 6 Answers
- 49489 Views
- I also Faced
- E-Mail Answers
Answer Posted / d.ramesh classes
Technical explanation
When the windings of a 3-phase motor are connected in STAR:
the voltage applied to each winding is reduced to only (1 /.'/'3) [1 divided by root three] of the voltage applied to the winding when it is connected directly across two incoming power service lines in DELTA.
the current per winding is reduced to only (1 /.'/'3) [1 divided by root three] of the normal running current taken when it is connected in DELTA.
so, because of the Power Law V [in volts] x I [in amps] = P [in watts],
the total output power when the motor is connected in STAR is:
PS = [VL x (1/.'/'3)] x [ID x (1/.'/'3)] = PD x (1/3) [one third of the power in DELTA]
where:
VL is the line-to-line voltage of the incoming 3-phase power service
ID is the line current drawn in DELTA
PS is the total power the motor can produce when running in STAR
PD is the total power it can produce when running in DELTA.
by D.RAMESH CLASSES
| Is This Answer Correct ? | 19 Yes | 8 No |
Post New Answer View All Answers
Is better to supply the voltage for static exciter from the auxiliary power source or from the SG terminals? And why?
Vibromotor 252MV 1/4HP2P..what is mean by 252MV?
current transformer balance the power level on both sides. e.g in case of step up, at secondary side voltage rise but current decrease and vice versa in case of step down transformer. but how this power level remains same in case of current transformer and voltage transformer
Electronic circuit
An active element is one which a. Supplies energy b. Absorbs energy c. Supplies energy and convert energy from one form to another
where reactive power is used
why actual valve timing diagram is different than ideal valve timing digram of a 4 stroke engine?
Why synchorised generators are used for the production of electricity?
what is per unit calculation?looking for simple and strong explanation thk u
how to calculate the battery AH
why 1.7Uo for HV cable Hi pot test?IE standard why?
What is the physical significance of phase.. i.e. what is exactly the meaning in layman's language.. 1 phase, 3 phase etc ???
in ACB breaker requireding 3200Amps. buscoupler getting OFF mode and again it reset and getting normal position give me a required answer?
whit is 33kv power 300*300 cable full current with formula
please write motor, transformer, Generator setting, fault level calculation of Tr.etc
