
9.9.3.2
Completing the test
M11758-57 v4
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.
9.9.4
Scheme communication logic for residual overcurrent
protection ECPSCH
M13926-2 v6
Prepare the IED for verification of settings outlined in Section
.
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
testing the communication logic for residual overcurrent protection. The current
reversal and weak-end-infeed functions shall be tested together with the permissive
scheme.
9.9.4.1
Testing the directional comparison logic function
M13926-7 v2
Blocking scheme
M13926-9 v6
1.
Inject the polarizing voltage 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
.
No TRIP signal should appear.
8.
Switch the fault current off.
9.
Reset the CR binary input.
10. Activate the BLOCK digital input.
1MRK 506 383-UEN A
Section 9
Testing functionality by secondary injection
Line distance protection REL650 2.2 IEC
153
Commissioning manual
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