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A 3 phase star connected winding is fed from symmetrical 3 phase supply with their neutrals connected together. If one of the 3 supply lines gets disconnected, then the revolving MMF wave will have a ___________

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A 3 phase star connected winding is fed from symmetrical 3 phase supply with their neutrals connected together. If one of the 3 supply lines gets disconnected, then the revolving MMF wave will have a ___________

(a) Constant amplitude but sub synchronous speed

(b) Varying amplitude but synchronous speed

(c) Constant amplitude but super synchronous speed

(d) Varying speed and a speed fluctuating around the synchronous speed

This question was addressed to me during an interview.

I'm obligated to ask this question of Rotating Magnetic Field in chapter Basic Concepts in Rotating Machines of Electrical Machines

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The correct option is (d) Varying speed and a speed fluctuating around the synchronous speed

Best explanation: With one supply phase disconnected, a rotating MMF wave of varying amplitude is produced, but at a speed fluctuating around the synchronous speed.

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