why the autotransformer burnt while stating the pumpmotor?,
In starter and motor there was no abnormality.
Answers were Sorted based on User's Feedback
Answer / k.prakashchandra
Autotransformer is for starting of large motor.If you use a
starter additionally ,it requires a certain minimum voltage
for the hold coil.As this voltage was high enough for heavy
starting current which burnt the autotransformer.
Is This Answer Correct ? | 5 Yes | 2 No |
Answer / amit kumar singh
The one reason may be that at the time of starting,
induction motor sucts very high inrush current for the
establishment of magnetic field. Thus the total MVA
requirement at the time of motor starting is about 6 to 7
times the rated MVA of motor (if voltage is considered to
remain constant at the time of starting).
As, a transformer can only withstand 1.5 times its rated
MVA (i.e. also only for short duration), the heavy
requirement of MVA by motor could have damaged the
transformer (in case of failure of tap changer operation to
reduce voltage applied before starting of motor).
Is This Answer Correct ? | 3 Yes | 1 No |
Answer / d.lakshmi narayana
To check the transformer tap voltage
persantage.(or)Unbalance the tap voltage (or)To take proper
tap voltage for motor starting load
Is This Answer Correct ? | 1 Yes | 1 No |
What is notching in dc machine?
hi this is hema, r there any books in particular for the preparation of the APPSC-A.E.E(electrical), if so please mail me the names ... thank u .
How the electric train gets the supply of electricity? What is the return path of the current?
why do you add the load short circuit impedance when considering short circuit amperage. It seems that you should only consider supply. If you need to consider loads and you don't know what loads are to be added , what would be a good sub-transient reactance rating for the loads?
what are problems caused by the pdu in rack server
The iron loss in a 100kva transformer is 1 kw and full load copper losses are 2 kw, then what is maximum efficiency occure at a load?
What is Skin effect in Cable?
List the time domain specifications.
What is the main feature of v/f control?
What is meant by rating error prevention in breaker??
A IS TWICE AS GOOD A WORKMAN AS B AND TOGETHER THEY FINISH A PIECE OF WORK IN 14 DAYS.THE NUMBER OF DAYS TAKEN BY A ALONE TO FINISH THE WORK IS 1.11 2.21 3.28 4.42
why reactor is connected before capacitor in APFC panel