ABB REG670 Commissioning Manual page 177

1MRK 502 073-UEN A
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Testing functionality by secondary injection
Test points X
ZxFwd · sin( LineAngle )
P1
ZxFwd - ZxRev / 2) · sin( LineAngle ))
P2 ((
ZxFwd - ZxRev / 2) · sin( LineAngle ))
P3 ((
ZxRev · 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 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
The load encroachment does not have any special output to be verified. It can only
be verified with the distance START and TRIP outputs.
Steps to test the load encroachment:
1. Supply the IED with healthy conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the injected impedance to find
the operate value for of the phase-to-earth and phase-to-phase loops.
Under voltage seal-in
The under voltage seal-in logic can be verified using the TRUV and STUV outputs.
Steps to verify the logic:
Section 13
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 )
-
GUID-4E0958A9-000E-440F-A880-89B54774AC63 v3
GUID-1219D2CC-D2EC-44B1-8F2E-A4C292590680 v2
171