Completing The Test - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
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.
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 trip 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 PICKUP and TRIP after the trip time delay is set for the
under voltage logic.
10.4.15.2

Completing the test

Continue to test another function or end the testing by setting the parameter
Disabled 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
10.5 Current protection
10.5.1 Instantaneous phase overcurrent protection 3-phase output
PHPIOC (50)
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
To verify the settings the following fault type should be tested:
• Phase-to-ground fault
Commissioning manual
Blocked to No under Main menu/Tests/Function test modes/Impedance/
Blocked to Yes , for each individual function that has been tested.
in this chapter.
Testing functionality by secondary injection
GUID-1219D2CC-D2EC-44B1-8F2E-A4C292590680 v2
GUID-93110921-550A-441F-A36F-901488CC41BB v3
TestMode to
"Requirements" and
Section 10
SEMOD53531-1 v1
M11754-3 v7
137