DELTA-CONNECTED WINDING
In delta connected winding
no zero sequence currents flow in the lines because there is no return path for
these currents.
STAR-CONNECTED WITHOUT
NEUTRAL WINDING
In a three-phase, a
three-wire system without a neutral network, the zero sequence line currents
are zero.
STAR-CONNECTED WITH NEUTRAL
GROUNDED
Three phase with neutral
return zero sequence currents can flow both in the phase and windings as well
as in the lines.
If the neutral is solidly
grounded Zn = 0.
Total zero sequence
impedance from point Ground to P is equal to the Total zero sequence impedance
from Neutral to P.
The voltage to neutral or
voltage to ground is the same in the case of positive and negative sequence
systems.
For solidly grounded system
zero sequence impedance is infinity.
No comments:
Post a Comment