ABB RELION RET670, Commissioning Manual, Page: 273 / 328

6. Switch the fault current on (110% of the set operating current) and measure the
operating time of the ECPSCH (85) logic.
Use the TRIP signal from the configured binary output to stop the timer.
7. Compare the measured time with the setting for tCoord .
8. Activate the BLOCK digital input.
9. Switch the fault current on (110% of the set operating current) and wait for a period
longer than the set value
tCoord .
No TRIP signal should appear.
10. Switch the fault current and the polarizing voltage off.
11. Reset the CR binary input and the BLOCK digital input.
11.11.4.2 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled . Restore connections and settings to their original values, if they were changed
for testing purposes.
11.11.5 Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH (85)
Prepare the IED for verification of settings as outlined in section "Requirements" and
section "Preparing for test" in this chapter.
Values of the logical signals for ECRWPSCH are available on the Local HMI under Main
menu/Tests/Function status/Scheme communication/ECRWPSCH(85)/ECRWPSCH:1.
The Signal Monitoring in PCM600 shows service values that are available on the Local
HMI as well.
First, test the four step residual overcurrent protection function EF4PTOC (51N/67N) and
then the current reversal and weak-end infeed logic according to the corresponding
instructions. Then continue with the instructions below.
11.11.5.1 Testing the current reversal logic
1MRK 504 165-UUS -
Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 267
Commissioning manual