Answer / sunil bhuarya

its sunil bhuarya
ans of this question is ut self in the que.
how-
5000/(root3)*11=262.43 aproxx=263
and in case of overloading it becomes 300 to 315A.

Answer / ynrao

263 Amps as the question itself says

Answer / serwox

Answer depends on what percentage overload a transformer can
accept. For a tx that can accept a 120% overload, the
current is 315A.

Answer / pravin

Actually it depends upon designer. If we asked designer to
designed for 125% overload, he will provide cooling per
current loading on 125% overload to restrict Hot Spot Temp.
of the winding & Top oil temp. respective to max. ambient
temp.
In this case, we can provide loading of 437A in
terms of ampere on top rating with Hot spot temp & top oil
temp in control on top rating. Actually transformer has
three rating OA/FA/FA. If this transformer is OA/FA/FA then
we can provide this loading.
If it is self cooled then 263A is max. loading.

Answer / sunil kumar das

above answer is also correct.we can put less than full
load current.

Answer / jayant subhash golait

If the word rated current comes,then it is actually safe n maximum permissible limit....Obviously,the machine will misbehave when crossed this limit...to save the machine or to avoid failures,extra cooling may be required that is also within tolerable range...again the manufacturer may declare that value as a rated current which is itself little bit away from tripping or breakdown or danger zone of tolerance....finally ,it is solely depend upon manufacturer n in turn the quality of raw material used to design the machine....

Answer / narayanan surendran

The question did not talk about cooling and Tap Changer Type.
If over loaded, voltage drop and over heating may occur.
Therefore given rated current 263 A is correct.

Answer / sam

That depends on the rated output's power factor and the
load power factor.

Answer / har

300amp

Answer / pankaj

Normayy transformer gives max efficieny at 75% of its rated
capacity because in that case cu loss = iron loss.

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