Question

While using three phase transformers, it is taken care about the third harmonics current in the system. This is present when transformer set is delta on either side.

(a) True

(b) False

I have been asked this question in unit test.

My question is taken from Three Phase Transformers in portion Transformers of Electrical Machines

Answer 1

Correct choice is (a) True

To elaborate: Third harmonic current are co-phase in nature and require closed path which is present in delta connected only.