11.11.7.10 Three phase undercurrent LCP3PTUC
GUID-8C3BA5FB-5878-4B87-BDF0-5DCDF72870B4 v1
Prepare the IED for verification of settings as outlined in section
"Requirements" and section
"Preparing for test" in this chapter.
1. Connect the test set for three-phase current injection to the appropriate IED terminals.
2. Inject a symmetrical three-phase current larger than the set value I<.
3. Decrease the injected current in phase L1 and note the operated value (start value) of the
studied step of the function.
4. Increase the current slowly and note the reset value.
5. Connect a trip output contact to a timer.
6. Decrease the injected current step-wise to 50% of the operate level and check the time delay.
7. Check that all trip and start contacts operate according to the configuration (signal matrices).
8. Finally check that start and trip information is stored in the event memory.
9. Repeat steps 2 – 7 for phases L2 and L3.
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.12 Logic
SEMOD53577-1 v1
11.12.1 Tripping logic, common 3-phase output SMPPTRC
SEMOD54375-102 v10
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to verify settings".
This function is functionality tested together with other protection functions (line differential protection,
earth-fault overcurrent protection, and so on) within the IED. It is recommended that the function is
tested together with the autorecloser function, when built into the IED or when a separate external
unit is used for reclosing purposes.
11.12.1.1 Function revision history
GUID-ADA72CE6-B6ED-48B3-A897-A7B42ECDEBB4 v2
Document
revision
Product
revision
History
A 2.2.1 STN (Start neutral) output added. IEC 61850 mapping is made for the added output.
B 2.2.1 -
C 2.2.2 -
D 2.2.3 -
E 2.2.3 -
F 2.2.4 -
G 2.2.4 Added TRINN (Trip neutral) input and TRN (trip neutral) outputs. TRINALL (Trip all
phases) input is changed from TRIN. IEC 61850 mapping is made for the added output.
The block logic is corrected for the lockout functionality.
H 2.2.5 -
11.12.1.2 3 phase operating mode
SEMOD54375-106 v10
1. Check that AutoLock and TripLockout are both set to Off .
2. Initiate a three-phase fault.
1MRK 505 378-UEN Rev. K Section 11
Testing functionality by secondary injection
Line differential protection RED670 233
Commissioning manual
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