Zero sequence component in unbalanced faults rotation

Thread Starter

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:
1613556545097.png
1613556556737.png
The second book:
1613556622959.png
Sources:

The first book:
TRANSIENT ANALYSIS OF ELECTRIC POWER CIRCUITS HANDBOOK
Published by Springer 2005
by
ARIEH L. SHENKMAN
ISBN-10 0-387-28797-3

The second book:
Protective Relaying Handbook, Volume 2
2009 Published by Inter National Electrical Testing Association
 
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