IG-150-EN version 04; 03/10/16
68
Protection functions. Description and settings General instructions
ekor.rps
4.6.9. Neutral directional (67N); polarization by S
0
+ S- + I (V
0
+ V2 + I
pol
)
Operation
The direction is determined regardless of the previous
criteria (V
0
,V
2
and I). If any of them determines that the
direction is the trip direction, the trip permission is given.
The earth fault directional units output is an OR of the
polarization by voltage and polarization by current units so
that the trip permission criterion prevails over the locking
criterion.
Trip permission without V
pol
(Directional Locking on the
display)
This setting is used only when in the three units the
polarization magnitude is below the threshold (V
polarization setting) in the case of the V
0
and the V
2
and
below 68 mA in the case of the current.
Signaling
It provides forward and reverse signaling. The directional
units output is an OR of the polarization by voltage and
polarization by current units so that the trip permission
criterion prevails over the locking criterion.
Being the trip permission without V
pol
((Directional Locking)
set as “NO”, if the polarization magnitudes are below the
threshold the direction is not signaled.
Being the trip permission without V
pol
(Directional Locking)
set as “YES”, if the polarization magnitudes are below the
threshold signals reverse and forward.
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