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An induction motor is fed from a balanced threephase supply at rated voltage and frequency through a bank of three single phase transformers connected in delta-delta. If one unit of the bank develops fault and is removed, then
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- single phasing will occur and the machine fails to start
- single phasing will not occur but the motor terminal voltages will become unbalanced and machine can be loaded to the extent of 57.7% of its rating
- machine can be loaded to the extent of 57.7% of its rating with balanced supply at its terminals.
- machine can be loaded to the extent of 66.66% with balanced supply at its terminals.
Correct Option: D
NA
