A 100/5 A bar primary current transformer supplies an overcurrent relay set at 25% pick up and it has a burden of 5 VA. The secondary voltage is
- A. 1 V
- B. 1.25 V
- C. 2.5 V
- D. 4 V
Answer: D. 4 V
Explanation: Relay pickup current = 25% of 5 A = 1.25 A. Secondary voltage Vs = Burden / Irelay = 5 VA / 1.25 A = 4 V.