Question

Does an open$\mathbf{∆}$connection permit balanced three-phase operation?

(a) Yes

(b) No

Short answer

Therefore, the correct option is (a) Yes.

Step-by-step solution

Explain about  ∆-∆ connection.

The Y-Y and $\mathbf{∆}\mathbf{-}\mathbf{∆}$ connections are used in the circuits, if phase shift is not required.

Using $∆-∆$connected transformers has a special advantage in a power system, that is, it avoids the transfer of harmonic current to the load.

Reason for using ∆  connection.

If any of the phase is damaged in the $∆$connection, it can be still used in the circuit after removing the single one-phase for repairing.

Therefore, open $∆$ connection permits the balanced three phase operation.

Hence, the correct option is (a) yes.