Completing The Test; Rotor Earth Fault Protection With Rxtte4 And General Current And Voltage Protection Cvgapc - ABB RELION REG670 Commissioning Manual

Section 12
Testing functionality by secondary injection
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:
1. Keep all the current and voltage in normal balanced condition.
2. Keeping the phase current at rated value, slowly reduce the voltage till it enters into the
respective zone mho characteristics and also below the set value of the under voltage
seal-in logic.
3. Before the operate time delay of the respective zone, reduce the current magnitude so
that the operating impedance moves out of the mho characteristics.
4. The under voltage seal-in should give a START and TRIP after the operate time delay is set
for the under voltage logic.
12.4.15.2

Completing the test

Continue to test another function or end the testing by setting the parameter
under Main menu/Tests/IED test mode/1: TESTMODE. If another function is tested, then set
the parameter
ZGVPDIS/1: ZGVPDIS for the function, or for each individual function in a chain, to be tested
next. Remember to set the parameter
been tested.
12.4.16 Rotor earth fault protection with RXTTE4 and general current
and voltage protection CVGAPC
Prepare the IED for verification of settings as outlined in section
section
152
Blocked to No under Main menu/Tests/Function test modes/Impedance/
"Preparing for test" in this chapter.
Blocked to Yes , for each individual function that has
1MRK 502 067-UEN B
GUID-4E0958A9-000E-440F-A880-89B54774AC63 v3
GUID-1219D2CC-D2EC-44B1-8F2E-A4C292590680 v2
GUID-93110921-550A-441F-A36F-901488CC41BB v3
TestMode to Off
SEMOD158692-3 v2
"Requirements" and
Commissioning manual