ABB REG670 2.0 IEC Commissioning Manual page 149

1MRK502053-UEN B
Generator protection REG670 2.0 IEC
Commissioning manual
Testing functionality by secondary injection
X
P3
Z1Rev
P4
IEC11000312 V2 EN
Figure 40: Proposed four test points for phase-to-phase fault
Where,
Z1Fwd is the forward positive sequence impedance setting for zone 1
Z1Rev
is the reverse positive sequence impedance setting for zone 1
LineAngle is the Impedance angle for phase-to-phase fault in degrees
Test points X
Z1Fwd · sin( LineAngle )
P1
Z1Fwd - Z1Rev / 2) · sin( LineAngle ))
P2 ((
P3 (( Z1Fwd - Z1Rev / 2) · sin( LineAngle ))
P4 - Z1Rev · sin 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 STZ1 are activated where x refers to the actual phase to be tested. After
the operate time delay for the zone 1 has elapsed, the signals TRIP and TRZ1 shall be
activated.
To verify zone 2 and zone 3 mho characteristic, at least two points must be tested.
P1
Z1Fwd
P2
LineAngle
IEC11000312-2-en.vsd
R
Z1Fwd · cos( LineAngle )
Z1Fwd / 2 · (1 + cos( LineAngle ) + Z1Rev /
2 · (1 – cos(
- Z1Fwd / 2 · (1 – cos( LineAngle ) + Z1Rev /
2 · (1 + cos(
- Z1Rev · cos( LineAngle )
Section 12
R
LineAngle ))
LineAngle ))
143