Using 11000V/433V,3 ph,50Hz,500 KVA, what is the maximum
capacity of motor in KW that can be connected and started at
a single moment? Also explain about any calculations and
formulas used in deriving the same.
Answers were Sorted based on User's Feedback
Answer / amr hamad
the transformer should not be full loaded all the time so,
its maximum load should be .8 of its full load rating =400kva
so , maximum power of motor should not increase 320kw with
0.8 pf
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / dinesh kannan
Since the motor is connected in 433V side , we consider
powerfactor 0.8.so maximum connected capacity of motor is
500*0.8, but we have to run the motor in single start
there are so many methods are there to start the motor like
DOL, star delta starters based on the starter and starting
current of motor we deside the maimun rating of motor( to
start the motor, minimum 70% of voltage is required
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / vijay krishna rao
considering DOL type of starter (so starting time will be
appx 6 times the rated current)and also considering starting
time of motor may affect the Xmer, then 500/6=83.33 MVA.
Motor rating (pf=0.8)=83.33*0.8=66.66kW (efficiency=100%)
If soft starter is used then motor rating can go upto Xmer
rating.
Is This Answer Correct ? | 0 Yes | 1 No |
what is the MNA in case of d.c. machin? whaty is the importance of it? hoe it affect the brush position?
if we supply DC power to AC transformer then what its result?
Which oil is used in Transformer?
In Transformer testing at Shop test we normally test for vector group, open ckt.,short ckt. but what are the other test performed for transformer once it reaches at site.For e.g:if the transformer is dry having rating 1000KVA?
how work the lighting arrestor?
what is hourly consumption of coal in therma plant
sir& friends i want the collection of recent quetions asked in interview of top most companies please send me on my email san.jsr@hotmail.com
where AVR is connected in power plant.
7 Answers ABB, Saudi Red Bricks,
How to find out freqency in Ac and Dc and also how u control it
Maximum efficiency occurs in electrical machines is at i)Full load,ii)50% of full load,iii)Near full load,iv)None of these
What is the need for checking knee point voltage for CT's?