Check Of Voltage Differential Trip And Alarm Levels - ABB RET670 Commissioning Manual

1MRK 504 165-UEN A
11.6.5.2
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
Check of U2Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and
figure 49.
UL1
UL2
UL3
UN
IEC07000107 V2 EN-US
Figure 49: Connection of the test set to the IED for test of U2 block level
where:
1 is three-phase voltage group1 (U1)
2 is three-phase voltage group2 (U2)
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 49.
The voltage differential START signal is set.
3. Decrease slowly the voltage in phase UL3 of the test set until the START
signal resets.
4. Check U2 blocking level by comparing the voltage level at reset with the set
undervoltage blocking U2Low.

Check of voltage differential trip and alarm levels

Procedure
1. Connect voltages to the IED according to valid connection diagram and
figure 50.
Section 11
SEMOD175258-91 v3
UL1
UL2
1
UL3
UN
UL1
2
UL2
UL3
IEC07000107-1-en.vsd
SEMOD175258-104 v3
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