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In a delta-connected system, the currents IR = IB = IY =?

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In a delta-connected system, the currents IR = IB = IY =?

(a) IPh

(b) 2IPh

(c) 3IPh

(d) 4IPh

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

This question is from Voltage, Current and Power in a Delta Connected System in chapter Polyphase Circuits of Network Theory

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The correct option is (a) IPh

To elaborate: In a delta-connected system, the currents IR = IB = IY = IPh. Since the system is balanced, the sum of the three voltages round the closed mesh is zero; consequently no current can flow around the mesh when the terminals are open.

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