6.4.5.2
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/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.
6.4.6
Four step residual overcurrent protection, zero or negative
sequence direction EF4PTOC (51N/67N)
Prepare the IED for verification of settings as outlined in
.
Values of the logical signals for EF4PTOC (51N67N) 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.
6.4.6.1
Four step directional residual overcurrent protection
1.
Connect the test set for single current injection to the appropriate IED terminals.
Connect the injection current and voltage to terminals A and neutral.
2.
Set the injected polarizing voltage slightly larger than the set minimum polarizing
voltage (default 1% of Vn) 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 A, repeat the test,
injecting current into terminals B and C with a polarizing voltage connected to
terminals B, respectively C.
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.
1MRK 506 331-UUS A
Section 6
Testing functionality
67
Commissioning Manual
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