ABB REG670 2.0 IEC, Commissioning Manual

Page: 150 / 268

P1
P3
P4
X
R
LineAngle
ZxFwd
ZxRev
P2
IEC11000313-1-en.vsd
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 R
P1
ZxFwd · sin(LineAngle) ZxFwd · cos(LineAngle)
P2 ((
ZxFwd -ZxRev / 2) · sin(LineAngle)) ZxFwd / 2 · (1 + cos(LineAngle) + ZxRev/2
· (1 – cos(
LineAngle))
P3 ((
ZxFwd -ZxRev / 2) · sin(LineAngle))
-
ZxFwd / 2 · (1 – cos(LineAngle) + ZxRev /
2 · (1 + cos(
LineAngle))
P4 -
ZxRev · sin(LineAngle)
-
ZxRev · cos(LineAngle)
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.
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
144 Generator protection REG670 2.0 IEC
Commissioning manual