11.6.5.3 Check of trip and trip reset timers
Procdure
1. Connect voltages to the IED according to valid connection diagram and figure 50.
2. Set Vn (rated voltage) to the V1 inputs and increase V2 voltage until differential
voltage is 1.5 · operating level (VDTrip).
3. Switch on the test set. Measure the time from activation of the PICKUP signal until
TRIP signal is activated.
4. Check the measured time by comparing it to the set trip time tTrip.
5. Increase the voltage until PICKUP signal resets. Measure the time from reset of
PICKUP signal to reset of TRIP signal.
6. Check the measured time by comparing it to the set trip reset time tReset.
11.6.5.4 Final adjustment of compensation for VT ratio differences
Procedure
1. With the protection in test mode, view the differential voltage service values in each
phase on the local HMI under Main menu/Test/Function status/Voltage
protection/VoltageDiff(PTOV,60)/VDCPTOV:x.
The IED voltage inputs should be connected to the VTs according to
valid connection diagram.
2. Record the differential voltages.
3. Calculate the compensation factor RF_x for each phase.
For information about calculation of the compensation factor, see the application
manual.
4. Set the compensation factors on the local HMI under Main menu/Settings/Settings
group N/Voltage protection/VoltageDiff(PTOV,60)/VDCPTOV:x
5. Check that the differential voltages are close to zero.
11.6.5.5 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 221
Commissioning manual
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