ABB Relion 670 Series Commissioning Manual page 171

1MRK 504 165-UUS Rev. J
IEC11000312 V2 EN-US
Figure 45:
Where,
Z1Fwd
Z1Rev
LineAngle
Test points
P1
P2
P3
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.
Transformer protection RET670
Commissioning manual
X
P3
LineAngle
Z1Rev
P4
Proposed four test points for phase-to-phase fault
is the forward positive sequence impedance setting for zone 1
is the reverse positive sequence impedance setting for zone 1
is the Impedance angle for phase-to-phase fault in degrees
X
Z1Fwd · sin(LineAngle)
((Z1Fwd -Z1Rev / 2) · sin(LineAngle))
((Z1Fwd -Z1Rev / 2) · sin(LineAngle))
-Z1Rev · sinLineAngle
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P1
Z1Fwd
P2
R
IEC11000312-2-en.vsd
R
Testing functionality by secondary injection
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)
Section 11
165