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Secondary Winding

A 100/5 A Cur...

Question

A 100/5 A Current transformer supplies an over current relay set at 25% pick up and it has a burden of 5 VA. The secondary voltage is __________ V
4

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Solution

The correct option is A 4
The relay current setting = 25%
$∴ T h e r e l a y o p e r a t e s a t a c u r r e n t o f$
$= 0.25 \times 5 = 1.25 A$
The VA burden on the relay is,
VA = 5
$5 = V \times 1.25$
$∴ V = 4 V$

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