ABB REG670 Commissioning Manual page 176

Section 13
Testing functionality by secondary injection
170
Test points X
Z1Fwd · sin( LineAngle )
P1
Z1Fwd - Z1Rev / 2) · sin( LineAngle ))
P2 ((
Z1Fwd - Z1Rev / 2) · sin( LineAngle ))
P3 ((
Z1Rev · 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 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.
X
P3
ZxRev
P4
IEC11000313 V2 EN-US
Figure 52: 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
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
R
Z1Fwd · cos( LineAngle )
Z1Fwd / 2 · (1 + cos( LineAngle ) +
Z1Rev / 2 · (1 – cos( LineAngle ))
Z1Fwd / 2 · (1 – cos( LineAngle ) +
-
Z1Rev / 2 · (1 + cos( LineAngle ))
Z1Rev · cos( LineAngle )
-
P1
ZxFwd
P2
LineAngle
IEC11000313-1-en.vsd
1MRK 502 073-UEN A
R
Commissioning manual