Why, the starting current of 3 phase Induction Motor is 7
to 8 times its rated current?
- 9 Answers
- 34282 Views
- L&T, I also Faced
- E-Mail Answers
Answer Posted / roysayan01
From the equivalent circuit of an induction motor it can be
seen that the the expression of current is
I=E/[(jX1+R1)+(jX2+R2/s)
Generally during running condition slip,s=0.03
i.e the value of slip is very low which increases the
resistance (R2/s) in the above eqn and as a result of which
current decreases
but
at starting s=1 and so the resistance (R2/s) is small and
the current is 7 to 8 times higher than the current during
running condition.
Hope i explained it vividly.
For ny doubt or query feel free to mail me at
roysayan01@gmail.com
| Is This Answer Correct ? | 46 Yes | 2 No |
Post New Answer View All Answers
Why is the air gap between the pole pieces and the armature kept very small?
The moisture in air will condense at
If only R Phase is connected in 2 pole elcb, n is not connected than it will work or not in ground fault.
Mention the difference between Analogue and Digital circuit?
WHICH SIZE A.B.CABLE IS USED FOR 11KV.
What is cut-off rate?
How to know of any cable size if there are not written on cabl?
What is reactive power and where it is used.
how you taken aotitude test
A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.
how define the torque in ac drive. from electrical side in the drive friquency ,voltage and current three factor is there.
What is critical disruptive voltage?
how can get electrical "c" licence.i am complited in DEEE.PASSING YEAR OF 1993.WORKING IN PVT COCERN LT LINE.PLEASE ADVISE ME .CELL NO 9994786021
what is kondo syatem in eletrical traction
For R-L or R-C ckt,time constant formula is L/R and RC respectively and its unit is in sec.Pls tell me the derivation
