Question

In a $\mathbf{∆}$-connected three-phase system, line currents have no zero-sequence component.

(a) True

(b) False

Short answer

Therefore, the correct option is (a): True.

Step-by-step solution

Define ungrounded system.

The zero-sequence current requires return path to flow. If there is ungrounded neutral then the impedance of neutral path is infinity that means zero sequence impedance is infinity and zero sequence network get open circuited.

Determine whether line currents have zero sequence current in delta connected system or not.

System with no neutral path as delta connected system or three wire star connected system with ungrounded neutral does not have the zero-sequence current.

Hence, delta connected three-phase system, line currents have no zero-sequence component.

Therefore, the correct option is (a) True.