10. Inject the polarizing voltage 3U0 to about 110% of the setting ( 3U0> ) and adjust the phase
angle between the voltage and current to (180°- AnglRCA) setting, the current leads the
voltage.
11. Inject current in one phase to about 110% of the set operate current (IN>Dir ).
12. Activate the CRL binary input.
No ECHO and TRWEI should appear.
13. Abruptly reverse the current to 65° lagging the voltage to operate the forward directional
element.
No ECHO and TRWEI should appear.
14. Switch the current off and check that the ECHO, CS and TRWEI appear on the corresponding
binary output during 200ms after resetting the directional element. If EF4PTOC also operates in
forward direction, CS should be obtained.
15. Switch the polarizing voltage off and reset the CRL binary input.
11.11.6.3 Completing the test
M13936-90 v5
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.
11.11.7 Direct transfer trip logic
GUID-F6AE5927-D93F-4CAD-A6C6-445720C806D8 v1
11.11.7.1 Low active power and power factor local criteria LAPPGAPC
GUID-5F73C74C-3BA1-4DF0-8D04-CE1416AF727D 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 and three-phase voltage to the
appropriate IED terminals.
2. Inject symmetrical phase voltages equal to the rated voltage.
3. Decrease the injected current in phase L1 and note the operated value (start value) of the
studied step of the function. This current shall have the same phase angle as the injected
phase voltage. The active power for operation is calculated as:
(single-phase
active power).
4. Increase the current slowly and note the reset value.
5. Connect a trip output contact to a timer.
6. Set the injected current to 50% of the operate level in the tested stage. Switch on the current
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. Repeat steps 3 – 6
for phases L2 and L3.
9. Inject symmetrical phase voltages and phase currents in all three phases, equal to SBase
(rated voltage and current).
10. Increase the phase angle between the injected phase voltages and phase current, and note the
operate value φ. The corresponding power factor is equal to
.
11. Decrease the phase angle and note the reset value.
1MRK 505 378-UEN Rev. K Section 11
Testing functionality by secondary injection
Line differential protection RED670 227
Commissioning manual
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