6. Activate the condition for accelerated function either by the autorecloser or by
the loss-of-load.
7. Apply a phase-to-earth fault at 100% of line impedance.
8. Check that the fault is tripped instantaneously.
10.11.4.2 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.
10.11.5 Scheme communication logic for residual overcurrent
protection ECPSCH
Prepare the IED for verification of settings outlined in section
"Preparing the IED to
verify settings".
Before testing the communication logic for residual overcurrent protection function
ECPSCH, the four step residual overcurrent protection function EF4PTOC 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 earth-fault protection is included,
proceed with the testing according to the corresponding instruction after the testing
the communication logic for residual overcurrent protection. The current reversal and
weak-end-infeed functions shall be tested together with the permissive scheme.
10.11.5.1 Testing the directional comparison logic function
Blocking scheme
1. Inject the polarizing voltage 3U0 at 5% of UBase (EF4PTOC) where the current
is lagging the voltage by 65°.
2. Inject current (65° lagging the voltage) in one phase at about 110% of the set
operating current, and switch the current off with the switch.
3. Switch the fault current on and measure the operating time of the communication
logic.
Use the TRIP signal from the configured binary output to stop the timer.
4. Compare the measured time with the set value tCoord.
5. Activate the CR binary input.
6. Check that the CRL output is activated when the CR input is activated.
7. Switch the fault current on (110% of the set operating current) and wait longer
than the set value tCoord.
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 217
Commissioning manual
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