Ormazabal ekor.rps, General Instructions Manual

Page: 65 / 144

IG-150-EN version 04; 03/10/16
65
General instructions
ekor.rps
Protection functions. Description and settings
Trip permission without V
pol
(Directional Locking on the
display)
This setting is used when the polarization voltage (3 V
0
) falls
below the threshold (setting V polarization), so that if it is
set as “YES”, it indicates forwards and if it is set as “NO”, it
indicates reverse.
Signaling
It provides forward and reverse signaling.
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, it signals reverse and forward.
4.6.4. Neutral directional (67N); polarization by S - (V
2
)
Operation with polarization by V
2
, reverse sequence voltage
The direction is determined using the negative sequence
current with the negative sequence voltage (V
2
) as
polarization. The angle determines the range in which the
fault is considered forwards and reverse. The setting angle
is the same as that used for the phase directional.
There is a 5
th
zone between the locking zone and the trip
zone, for which the present directional status is maintained.
1
2
3
90 - setting angle < arg (I
2
) – arg (V
2
) < 270 - setting angle
1
Trip zone
2
Locking zone
3
Setting angle
Figure 4.8.
Negative sequence directional
Trip permission without V
pol
(Directional Locking on the
display)
This setting is used when the polarization voltage (V
2
) falls
below the threshold (V polarization setting), so that, if it is
set as “YES”, it indicates forwards and if it is set as “NO”, it
indicates reverse.
Signaling
It provides forward and reverse signaling.
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.