ABB REG670 2.0 IEC, Commissioning Manual

Page: 154 / 268

4. Close the switch to the station earth and check that the trip from the rotor earth
fault will be given after the set delay time.
5. Open the switch to the station earth and check that the trip signal resets
instantaneously.
6. Connect an adjustable resistor to the field circuit (221 on RXTTE4). Decrease
this resistor from a large value until the function operates and check monitored
value
ICOSFI .
When the generator has been started the service value of injection voltage and
injection current shall be checked so that there is no risk for unwanted trip due
to large capacitive detected current.
12.4.8.2 Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off . Restore connections and settings to their original values, if they were changed for
testing purposes.
12.5 Current protection
12.5.1 Instantaneous phase overcurrent protection 3-phase output
PHPIOC
Prepare the IED for verification of settings outlined in section "Requirements" and
section "Preparing for test" in this chapter.
To verify the settings the following fault type should be tested:
• Phase-to-earth fault
Ensure that the maximum continuous current, supplied from the current source used
for the test of the IED, does not exceed four times the rated current value of the IED.
12.5.1.1 Measuring the operate limit of set values
1. Inject a phase current into the IED with an initial value below that of the setting.
2. Set the operation mode to 1 out of 3 .
3. Increase the injected current in the Ln phase until the TRL (n=1–3) signal
appears.
4. Switch the fault current off.
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
148 Generator protection REG670 2.0 IEC
Commissioning manual