Transformers
Which of the following 3 phase connections of transformer create disturbances in communication systems

Star/Star
Delta/Star
Star/Delta
Delta/Delta

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Transformers
In case of 3-phase induction motors, plugging means

pulling the motor directly on line without a starter
interchanging two supply phases for quick stopping
starting the motor on load which is more than the rated load
locking of rotor due to harmonics

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