# Zero sequence component in unbalanced faults rotation

#### skyline977

Joined Jan 14, 2021
29
Hi,
I am trying to understand the physical/practical meaning of the zero sequence component, I referred to some books. however, I am not sure is me or are there different interpretation of the zero sequence phasor regarding whether they are rotational or not?
I know that positive sequence rotates as the original equipment rotation, whereas, negative sequence rotates in the opposite direction and thus it tends to reduce the positive sequence torque.
But, I don't know how the zero sequence contribute if it does to the rotation, does it have a torque?
I highlighted the confusing information.
The first book:

The second book:

Sources:

The first book:
TRANSIENT ANALYSIS OF ELECTRIC POWER CIRCUITS HANDBOOK