Voltage Differential Protection Vdcptov; Check Of Undervoltage Levels - ABB RET670 Installation And Commissioning Manual

1MRK 504 088-UEN C
13.7.5
13.7.5.1
Installation and commissioning manual

Voltage differential protection VDCPTOV

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

Check of undervoltage levels

This test is relevant if the setting BlkDiffAtULow = Yes.
U1Low
Check of
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.
Verifying settings by secondary injection
in this chapter.
Section 13
"Overview" and
159