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ranjan kumar


{ City } cuttack
< Country > india
* Profession * dy mgr electrical
User No # 54234
Total Questions Posted # 0
Total Answers Posted # 5

Total Answers Posted for My Questions # 0
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Questions / { ranjan kumar }
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Answers / { ranjan kumar }

Question { 4586 }

what is O.T?specify the acceptable range?


Answer

OT means oil temperature of transformer.
The limit is maximum ambient temperature of your site of
installation+50 deg C

Is This Answer Correct ?    0 Yes 0 No

Question { HLL, 6020 }

In a star(primary) to delta(secondary) transformer,how you
take the neutral point?


Answer

In primary (star) u can easily get the neutral
point/earthing point & in the secondary (delta) u can get
the neutarl point by using Zig-Zag (V- connected)
transformer.

Is This Answer Correct ?    1 Yes 4 No


Question { 7526 }

Amoung all classes of electric machines, why the
transformer uses oil as one medium of cooling?


Answer

the above answers are almost correct.but i would like to
inform that we are also using air cored/cooled small x'mers
also as control x'mer upto 6KVA.In large KVA x'mer copy the
above answers.

Is This Answer Correct ?    0 Yes 0 No

Question { JSW, 10362 }

as we know that N=120f/P
speed of an im can be controled only through changing no if
poles, can we control by changing the frequncy????


Answer

yes, definitely.as u know we are using the VFD drives for
speed variation w.r.t frequency.

Is This Answer Correct ?    3 Yes 0 No

Question { 7534 }

what will be fault level of 11 KV , 2000 A ELECTRICAL
SYSTEM?


Answer

fault level depends on your system's percetage impedance.In
general practice we are using 28KA for 3 secs. or 40KA for
3 secs.

Is This Answer Correct ?    1 Yes 0 No