ABB REG670 2.0 IEC Commissioning Manual page 150

Section 12
Testing functionality by secondary injection
144
X
P3
ZxRev
P4
IEC11000313 V2 EN
Figure 41: Proposed four test points for phase-to-earth fault
Where,
ZxFwd is the forward positive sequence impedance setting for zone x (where, x is 2- 3
depending on the zone selected)
ZxRev is the reverse positive sequence impedance setting for zone x (where x is 2- 3
depending on the zone selected)
LineAngle
is the Impedance angle for phase-to-phase fault in degrees
Test points X
ZxFwd · sin( LineAngle )
P1
ZxFwd - ZxRev / 2) · sin( LineAngle ))
P2 ((
ZxFwd - ZxRev / 2) · sin( LineAngle ))
P3 ((
ZxRev · sin( LineAngle )
P4 -
Change the magnitude and angle of phase-to-phase voltage to achieve impedances at
test points P1, P2, P3 and P4. For each test point, observe that the output signals,
START and STZx are activated (where x is 2 or 3 depending on selected zone). After
the operate time delay of the respective zone has elapsed, also the signals TRIP and
TRZx (where x is 2 or 3 depending on selected zone) shall be activated.
P1
ZxFwd
P2
LineAngle
IEC11000313-1-en.vsd
R
ZxFwd · cos( LineAngle )
ZxFwd / 2 · (1 + cos( LineAngle ) + ZxRev /2
· (1 – cos(
ZxFwd / 2 · (1 – cos( LineAngle ) + ZxRev /
-
2 · (1 + cos(
ZxRev · cos( LineAngle )
-
Generator protection REG670 2.0 IEC
1MRK502053-UEN B
R
LineAngle ))
LineAngle ))
Commissioning manual