ABB REG670 Commissioning Manual page 190

Section 13
Testing functionality by secondary injection
184
ZxFwd
is the forward positive sequence impedance setting for zone x (where, x is 2- 3
depending on the zone selected)
ZxRev
is the reverse positive sequence impedance setting for zone x (where x is 2- 3
depending on the zone selected)
LineAngle
is the Impedance angle for phase-to-phase fault in degrees
Test points X
ZxFwd · sin( LineAngle )
P1
ZxFwd - ZxRev / 2) · sin( LineAngle ))
P2 ((
P3 (( ZxFwd - ZxRev / 2) · sin( LineAngle ))
P4 - ZxRev · sin( LineAngle )
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_Zx are activated (where x is 2 or 3 depending on selected zone).
After the trip 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 PICKUP 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
trip value for of the phase-to-ground and phase-to-phase loops.
Under voltage seal-in
The under voltage seal-in logic can be verified using the 27 Trip and 27 PU outputs.
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
1MRK 502 073-UUS A
R
ZxFwd · cos( LineAngle )
ZxFwd / 2 · (1 + cos( LineAngle ) + ZxRev /2
LineAngle ))
· (1 – cos(
- ZxFwd / 2 · (1 – cos( LineAngle ) + ZxRev /
LineAngle ))
2 · (1 + cos(
- ZxRev · cos( LineAngle )
GUID-4E0958A9-000E-440F-A880-89B54774AC63 v3
GUID-1219D2CC-D2EC-44B1-8F2E-A4C292590680 v2
Commissioning manual