13.6.5.3 Check of trip and trip reset timers
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Procdure
1. Connect voltages to the IED according to valid connection diagram and figure
60.
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.
13.6.5.4 Final adjustment of compensation for VT ratio differences
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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.
13.6.5.5 Completing the test
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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.
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
228 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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