Question

Under short-circuit condition, the windings of a transformer having
5% impedance will experience a radial force
(a) 5 times of full load value.
(b) 20 times of full load value.
(c) 25 times of full load value.
(d) 400 times of full load value. ​

Answer 1

Answer:

which of this book question

Answer 2

Answer:

Under short circuit conditions in transformers the force acting on it is directly proportional to square of current....

we already know that the

F= BIL.

Here B depends on I so Force = I2.

For this given impedance i.e. 5% ; short circuit current will increase to 20 times and,

Hence; 20×20= 400 times the force.