15.7.3 Two step residual overvoltage protection ROV2PTOV
Prepare the IED for verification of settings outlined in section "Overview" and
section "Preparing for test" in this chapter.
15.7.3.1 Verifying the settings
1. Apply the single-phase voltage either to a single phase voltage input or to a
residual voltage input with the start value below the set value U1>.
2. Slowly increase the value until ST1 appears.
3. Note the operate value and compare it with the set value.
4. Switch the applied voltage off.
5. Set and apply about 20% higher voltage than the measured operate value for
one phase.
6. Measure the time delay for the TR1 signal and compare it with the set value.
7. Repeat the test for step
2.
15.7.3.2 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
15.7.4 Overexcitation protection OEXPVPH
Prepare the IED for verification of settings outlined in section
"Overview" and
section
"Preparing for test" in this chapter.
15.7.4.1 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
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 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 V/Hz>.
5. Reduce the voltage slowly and note the reset value.
1MRK 502 029-UEN A Section 15
Verifying settings by secondary injection
193
Installation and commissioning manual
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