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In delta-connected system, the currents IR, IY, IB are equal in magnitude and they are displaced by _____ from one another.(a) 0⁰(b) 60⁰(c) 90⁰(d) 120⁰I had been asked this question in semester exam.Asked question is from Voltage, Current and Power in a Delta Connected System topic in portion Polyphase Circuits of Network Theory

Answer»

Right answer is (d) 120⁰

The BEST I can explain: In delta-connected system, the currents IR, IY, IB are equal in magnitude and they are displaced by 120⁰ from one another. From the manner of interconnection of the three phases in the circuit, it may APPEAR that the three phase are short circuited AMONG themselves.



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