4.
Increase the injected current and note the operate value of the tested step of the
function.
5.
Decrease the current slowly and note the reset value.
6.
If the test has been performed by injection of current in phase A, repeat the test,
injecting current into phases B and C with polarizing voltage connected to phases
B, respectively C (
1 out of 3
currents for operation).
7.
If the test has been performed by injection of current in phases AB, repeat the
test, injecting current into phases BC and CA with the appropriate phase angle of
injected currents.
8.
Block higher set stages when testing lower set stages by following the procedure
described below.
9.
Connect a trip output contact to a timer.
10. Set the injected current to 200% of the operate level of the tested stage, 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
.
11. Check that all trip and pickup contacts operate according to the configuration
(signal matrixes)
12. Reverse the direction of the injected current and check that the protection does
not operate.
13. Repeat the above described tests for the higher set stages.
14. Finally check that pickup and trip information is stored in the event menu.
Verification of the non-directional phase overcurrent function is
done as instructed above, without applying any polarizing voltage.
6.4.3.2
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Disabled
under
Main menu/Tests/IED test mode/1:TESTMODE
. If another
function is tested, then set the parameter
Blocked
to
No
under
Main menu/Tests/
Function test modes/Current/OC4PTOC(51_67,4I>)/1:OC4PTOC
for the function,
or for each individual function in a chain, to be tested next. Remember to set the
parameter
Blocked
to
Yes
, for each individual function that has been tested.
6.4.4
Four step phase overcurrent protection phase segregated
output OC4SPTOC (51_67)
Prepare the IED for verification of settings as outlined in
Section 6
1MRK 506 331-UUS A
Testing functionality
64
Commissioning Manual
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