11.6.3.2 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.
11.6.4 Overexcitation protection OEXPVPH (24)
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
11.6.4.1 Verifying the settings
1. Enable function.
2. Connect a symmetrical three-phase voltage input from the test set to the appropriate
connection terminals of the overexcitation protection OEXPVPH (24) is configured
for a three-phase voltage input.
A single-phase injection voltage is applied if the function is configured for a phase-
to-phase voltage input.
OEXPVPH (24) is conveniently tested using rated frequency for the injection
voltage and increasing the injection voltage to get the desired overexcitation level.
3. Connect the alarm contact to the timer and set the time delay tAlarm temporarily to
zero.
4. Increase the voltage and note the operate value Pickup1.
5. Reduce the voltage slowly and note the reset value.
6. Set the alarm time delay to the correct value according to the setting plan and check
the time delay, injecting a voltage corresponding to 1.2 · Pickup1.
7. Connect a trip output contact to the timer and temporarily set the time delay
t_MinTripDelay to 0.5s.
8. Increase the voltage and note the Pickup2 operate value
9. Reduce the voltage slowly and note the reset value.
10. Set the time delay to the correct value according to the setting plan and check the
time delay t_MinTripDelay, injecting a voltage corresponding to 1.2 · Pickup2.
11. Check that trip and alarm contacts operate according to the configuration logic.
12. Set the cooling time constant temporarily to min value (1min.) to quickly lower the
thermal content.
13. Wait for a period equal to 6 times t_CoolingK switch 20 minutes on a voltage 1.15 ·
Pickup1 and check the inverse operate time.
Wait until the thermal memory is emptied, set the cooling time constant according
to the setting plan and check another point on the inverse time curve injecting a
voltage 1.3 · Pickup1.
14. Finally check that PICKUP and TRIP information is stored in the event menu.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
216 Transformer protection RET670 2.2 ANSI
Commissioning manual
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