Voltage Protection; Two Step Undervoltage Protection Uv2Ptuv; Verifying The Settings; Completing The Test - ABB RET670 Installation And Commissioning Manual

Section 13
Verifying settings by secondary injection
13.7
13.7.1
13.7.1.1
13.7.1.2
13.7.2
156

Voltage protection

Two step undervoltage protection UV2PTUV

Prepare the IED for verification of settings as outlined in section
section "Preparing for test"

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.

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.

Two step overvoltage protection OV2PTOV

Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
in this chapter.
in this chapter.
1MRK 504 088-UEN C
"Overview"
"Overview"
Installation and commissioning manual
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