Discussion
A tertiary or stabilising winding on a three-phase transformer is provided to
Answer: D
Correct answer: give a path for triple harmonic and unbalance currents
A closed delta tertiary lets triple harmonic magnetising currents circulate within it rather than distorting the flux, and it also provides a path for zero sequence current under unbalanced loading, so the neutral is stabilised. It is often used to supply station auxiliaries as well, but that is a convenience rather than its purpose.
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