ABB Relion 670 Series Commissioning Manual page 165

1MRK 504 165-UEN E
If the measurement of the operating characteristics runs under constant voltage conditions,
ensure that the maximum continuous current in an IED does not exceed four times its rated
value.
To verify the zone 1 mho characteristic, at least two points must be tested.
IEC11000312 V2 EN-US
Figure 45: Proposed four test points for phase-to-phase fault
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, 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.
Transformer protection RET670
Commissioning manual
X
P3
LineAngle
Z1Rev
P4
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 · sin LineAngle
-
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P1
Z1Fwd
P2
R
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 )
-
Testing functionality by secondary injection
LineAngle ))
LineAngle ))
Section 11
159