6.3.3.2
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Off
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/EFPIOC(50N,IN>>)/1:EFPIOC
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.
6.3.4
Four step residual overcurrent protection EF4PTOC
Prepare the IED for verification of settings as outlined in
.
Values of the logical signals for EF4PTOC are available on the local HMI under
Main menu/Tests/Function status/Current/EF4PTOC(51N67N,4IN>)/
X:EF4PTOC
. The Signal Monitoring in PCM600 shows the same signals that are
available on the local HMI.
6.3.4.1
Four step directional residual overcurrent protection
1.
Connect the test set for single current injection to the appropriate IED terminals.
Connect the injection current to terminals L1 and neutral, or to terminals N
and neutral.
2.
Set the injected polarizing voltage slightly larger than the set minimum
polarizing voltage (default 1% 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 when 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 trip 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.
1MRK 511 248-UEN -
Section 6
Testing functionality
43
Commissioning Manual
