Connect the injection current to terminals L1 and neutral.
2.
Set the injected polarizing voltage slightly larger than the set minimum polarizing voltage
(default 5% of Ur) and set the injection current to lag the voltage by an angle equal to the
set reference characteristic angle (
AngleRCA), if the forward directional function is
selected.
If reverse directional function is selected, set the injection current to lag the polarizing
voltage by an angle equal to RCA+ 180°.
3.
Increase the injected current and note the value at which the studied step of the function
operates.
4.
Decrease the current slowly and note the reset value.
5.
If the test has been performed by injection of current in phase L1, repeat the test,
injecting current into terminals L2 and L3 with a polarizing voltage connected to
terminals L2, respectively L3.
6.
Block lower set steps when testing higher set steps according to the instructions that
follow.
7.
Connect a trip output contact to a timer.
8.
Set the injected current to 200% of the operate level of the tested step, switch on the
current and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the operate
current for
txMin.
9.
Check that all operate and start contacts operate according to the configuration (signal
matrixes)
10. Reverse the direction of the injected current and check that the step does not operate.
11.
Check that the protection does not operate when the polarizing voltage is zero.
12.
Repeat the above described tests for the higher set steps.
13. Finally, check that start and trip information is stored in the event menu.
12.5.4.2
Four step non-directional earth fault protection
SEMOD53296-202 v4
1.
Do as described in
"Four step directional earth fault protection"
any polarizing voltage.
12.5.4.3
Completing the test
SEMOD53296-122 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.
12.5.5
Four step negative sequence overcurrent protection NS4PTOC
GUID-EB1A8DFD-5BAC-4024-ADA2-D9BE7A2B50A0 v1
Prepare the IED for verification of settings as outlined in section
in this chapter.
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
When inverse time overcurrent characteristic is selected, the operate time of
the stage will be the sum of the inverse time delay and the set definite time
delay. Thus, if only the inverse time delay is required, it is important to set the
definite time delay for that stage to zero.
GUID-F973601F-BC67-4E4F-A4CA-BE6253E2FB92 v3
Procedure
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
157
Commissioning manual
