Completing The Test; Scheme Communication Logic For Residual Overcurrent Protection Ecpsch (85); Testing The Directional Comparison Logic Function - ABB RET670 Commissioning Manual

1MRK 504 165-UUS -
11.11.3.3
11.11.4
11.11.4.1
Transformer protection RET670 2.2 ANSI
Commissioning manual
The setting parameter WEI is set to Echo & Trip.
1. Apply input signals according Table 35.
2. Activate the receive (CR) signal.
3. After the IED has operated, turn off the input signals.
4. Check that trip, send signal, and indication are obtained.
The ECHO output gives only a 200 ms pulse.

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.
Scheme communication logic for residual overcurrent
protection ECPSCH (85)
Prepare the IED for verification of settings outlined in Section
verify settings".
Before testing the communication logic for residual overcurrent protection function
ECPSCH (85), the four step residual overcurrent protection function EF4PTOC (51N/
67N) has to be tested according to the corresponding instruction. Once this is done,
continue with the instructions below.
If the current reversal and weak-end infeed logic for ground-fault protection is included,
proceed with the testing according to the corresponding instruction after testing the
communication logic for residual overcurrent protection. The current reversal and weak-
end-infeed functions shall be tested together with the permissive scheme.

Testing the directional comparison logic function

Blocking scheme
Testing functionality by secondary injection
Section 11
"Preparing the IED to
265