13.7 Voltage protection
13.7.1
Two step undervoltage protection UV2PTUV
Prepare the IED for verification of settings as outlined in section
"Overview" and
section "Preparing for test" in this chapter.
13.7.1.1
Verifying the settings
Verification of START value and time delay to operate for Step1
1. Check that the IED settings are appropriate, especially the START value, the
definite time delay and the 1 out of 3 operation mode.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the voltage in one of the phases, until the START signal
appears.
4. Note the operate value and compare it with the set value.
5. Increase the measured voltage to rated load conditions.
6. Check that the START signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower
than the measured operate value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
Extended testing
1. The test above can now be repeated for step
2.
2. The
tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.
3. The tests above can be repeated to check security, that is, the START and
operate signals, that are not supposed to appear, - do not.
4. The tests above can be repeated to check the time to reset.
5. The tests above can be repeated to test the inverse time characteristic.
13.7.1.2 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.
13.7.2 Two step overvoltage protection OV2PTOV
Prepare the IED for verification of settings as outlined in section
"Overview" and
section "Preparing for test" in this chapter.
Section 13 1MRK 504 088-UEN C
Verifying settings by secondary injection
156
Installation and commissioning manual
To Next Page
Loading...
Need help?
General
