Verification of the non-directional phase overcurrent function is
done as instructed above, without applying any polarizing voltage.
6.3.3.2 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/TESTMODE:1. If another function is
tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Current/OC4PTOC(51_67,4I>)/OC4PTOC:1 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 phase overcurrent protection phase segregated
output OC4SPTOC (51_67)
Prepare the IED for verification of settings as outlined in 5.1 "Preparing the IED to verify
settings".
Values of the logical signals for OC4SPTOC (51_67) are available on the local HMI under
Main menu/Tests/Function status/Current/OC4SPTOC(51_67,4I>)/OC4SPTOC:1.
The Signal Monitoring in PCM600 shows the same signals that are available on the local
HMI.
6.3.4.1 Verifying the settings
1. Connect the test set for appropriate current injection to the appropriate IED phases.
If there is any configuration logic that is used to enable/block any of the four available
overcurrent steps, make sure that the step under test is enabled, for example end fault
protection. Connect the symmetrical three-phase injection current into phases A, B
and C.
2. Connect the test set for the appropriate three-phase voltage injection to the IED
phases A, B and C.
Make sure that the protection is fed with a symmetrical three-phase voltage.
3. Set the injected polarizing voltage slightly larger than the set minimum polarizing
voltage (default is 5% of VBase) and set the injection current to lag the appropriate
voltage by an angle of about 55° if 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 235° (equal to 55° + 180°).
4. Increase the injected current and note the operated value of the tested step of the
function.
5. Decrease the current slowly and note the reset value.
1MRK 505 293-UUS A Section 6
Testing functionality
49
Commissioning manual
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