Check Of Undervoltage Levels - ABB RELION REG670 Commissioning Manual

1MRK 502 067-UEN B
12.6.5.1

Check of undervoltage levels

This test is relevant if the setting
Check of U1Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure 60.
2. Apply voltage higher than the highest set value of
three-phase inputs and to one phase of the U2 inputs according to figure 60.
The voltage differential START signal is set.
IEC07000106 V2 EN-US
Figure 60: Connection of the test set to the IED for test of U1 block level
where:
1
2
3. Decrease slowly the voltage in phase UL1 of the test set until the START signal resets.
4. Check U1 blocking level by comparing the voltage level at reset with the set undervoltage
blocking
5. Repeat steps
Check of U2Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure 61.
Commissioning manual
BlkDiffAtULow = Yes .
UL1
UL2
UL3
UN
is three-phase voltage group1 (U1)
is three-phase voltage group2 (U2)
U1Low .
U1Low for the other phases.
2 to 4 to check
The connections to U1 must be shifted to test another phase. (UL1 to UL2,
UL2 to UL3, UL3 to UL1)
Testing functionality by secondary injection
UDTrip , U1Low and U2Low to the U1
UL1
UL2
1
UL3
UN
UL1
2
UL2
UL3
IEC07000106-1-en.vsd
Section 12
SEMOD175258-71 v2
SEMOD175258-75 v3
SEMOD175258-91 v3
187