ABB REG670 Commissioning Manual page 189

1MRK 502 073-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
Test points X
Z1Fwd · sin( LineAngle )
P1
P2 (( Z1Fwd - Z1Rev / 2) · sin( LineAngle ))
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,
PICKUP and PU_Z1 are activated where x refers to the actual phase to be tested. After
the trip 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. The
default measuring loop selected is maximum current phase to current loop. Hence the
below characteristics are tested with phase–to-ground fault conditions.
X
P3
ZxRev
P4
IEC11000313 V2 EN-US
Figure 52: Proposed four test points for phase-to-earth fault
Where,
Testing functionality by secondary injection
R
P1
ZxFwd
P2
LineAngle
Section 13
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 )
-
R
IEC11000313-1-en.vsd
183