ABB RET670 - Voltage Differential Protection VDCPTOV; Check of Undervoltage Levels

13.7.5 Voltage differential protection VDCPTOV
Prepare the IED for verification of settings as outlined in section "Overview" and
section "Preparing for test" in this chapter.
13.7.5.1
Check of undervoltage levels
This test is relevant if the setting BlkDiffAtULow = Yes.
Check of
U1Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure
63.
2.
Apply voltage higher than the highest set value of UDTrip, U1Low and
U2Low to the U1 three-phase inputs and to one phase of the U2 inputs
according to figure
63.
The voltage differential
START signal is set.
1MRK 504 088-UEN C Section 13
Verifying settings by secondary injection
159
Installation and commissioning manual