ABB REG670 Commissioning Manual page 169

1MRK 502 073-UEN Rev. J
IEC11000313 V2 EN-US
Figure 56:
Where,
ZxFwd
ZxRev
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 STZx are
activated (where x is 2 or 3 depending on selected zone). After the operate time delay of the
respective zone has elapsed, also the signals TRIP and TRZx (where x is 2 or 3 depending on
selected zone) shall be activated.
Load encroachment
Load encroachment operates on the same measuring principles as the impedance measuring zones.
Thus, it is necessary to follow the same principles as for distance protection when performing the
secondary injection tests. Measure operating characteristics during constant current conditions. Keep
the injected current as close as possible to the rated value of its associated input transformer or
lower. Ensure, however, that it is higher than 30% of the rated current. Ensure that the maximum
continuous current of an IED does not exceed four times Its rated value, if the measurement of the
operating characteristics runs under constant voltage conditions.
Measuring the operate limit of set values of load encroachment function
Generator protection REG670
Commissioning manual
X
P3
LineAngle
ZxRev
P4
Proposed four test points for phase-to-earth fault
is the forward positive sequence impedance setting for zone x (where, x is 2- 3 depending
on the zone selected)
is the reverse positive sequence impedance setting for zone x (where x is 2- 3 depending on
the zone selected)
is the Impedance angle for phase-to-phase fault in degrees
X
ZxFwd · sin(LineAngle)
((ZxFwd -ZxRev / 2) · sin(LineAngle))
((ZxFwd -ZxRev / 2) · sin(LineAngle))
-ZxRev · sin(LineAngle)
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P1
ZxFwd
P2
IEC11000313-1-en.vsd
R
ZxFwd · cos(LineAngle)
ZxFwd / 2 · (1 + cos(LineAngle) + ZxRev/2 · (1
– cos(LineAngle))
-ZxFwd / 2 · (1 – cos(LineAngle) + ZxRev / 2 ·
(1 + cos(LineAngle))
-ZxRev · cos(LineAngle)
Section 13
Testing functionality by secondary injection
R
GUID-4E0958A9-000E-440F-A880-89B54774AC63 v3
163