Question

What is the formula of the phase angle of the secondary load circuit?

(a) phase angle of secondary load circuit = tan^-1 * (reactance of the external burden/resistance of the external burden)

(b) phase angle of secondary load circuit = tan^-1 * (reactance of the external burden + resistance of the external burden)

(c) phase angle of secondary load circuit = tan^-1 * (reactance of the external burden – resistance of the external burden)

(d) phase angle of secondary load circuit = tan^-1 * (reactance of the external burden * resistance of the external burden)

I got this question by my college director while I was bunking the class.

The doubt is from Errors in portion Design of Current Transformers (CT) of Design of Electrical Machines

Answer 1

Right choice is (a) phase angle of secondary load circuit = tan^-1 * (reactance of the external burden/resistance of the external burden)

The best I can explain: The reactance and resistance of the external burden is first calculated. Next, the value is taken tan inverse to obtain the phase angle of secondary load circuit.