4. Check that trip and alarm contacts operate according to the configuration logic.
5. Decrease the current slowly from operate value and note the reset value.
6. Check in the same way the function by injecting current in phases L2 and L3.
7. Inject a symmetrical three-phase current and note the operate value.
8. Connect the timer and set the current to twice the operate value.
9. Switch on the current and note the operate time.
10. Check in the same way the functioning of the measuring circuits connected to the
CTs on the neutral point side of the generator.
11. Finally check that trip information is stored in the event menu.
Information on how to use the event menu is found in the
operator’s manual.
12. If available on the test set a second-harmonic current of about 20% (assumes
15% setting on I1/I2 ratio parameter) can be added to the fundamental tone in
phase L1. Increase the current in phase L1 above the start value measured in step
3. Repeat test with current injection in phases L2 and L3 respectively.
Fifth-harmonic blocking can be tested in a similar way.
The balancing of currents flowing into and out of the differential zone is
typically checked by primary testing.
6.3.4.2 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/TESTMODE:1. If another function
is tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Differential/GENPDIF(87G,IdG)/GENPDIF: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.
6.4 Testing impedance protection functions
6.4.1 Power swing detection ZMRPSB
The aim is to verify that the settings of the Power swing detection function ZMRPSB
is according to the setting table and to verify that ZMRPSB operates as expected.
Prepare the IED for verification of settings as outlined in
5.1 "Preparing the IED to
verify settings".
Values of the logical signals for ZMRPSB are available on the local HMI under Main
menu/Tests/Function status/Impedance/ZMRPSB(68)/ZMRPSB:1. The Signal
Monitoring in PCM600 shows the same signals that are available on the local HMI.
Before starting this process, all impedance measuring zones shall be set and in
operation. Test the outer resistive boarder in forward and reverse direction,
Section 6 1MRK 502 049-UEN A
Testing functionality
48
Commissioning manual
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