UL1
UL2
UL3
UN
UL1
UL1
UL2
UL3
IE
D
T
E
S
T
S
E
T
IE
D
IEC07000107-1-en.vsd
UL2
UL3
UN
1
2
IEC07000107 V2 EN-US
Figure 47: 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 UDT
rip, U1Low and
U2Low to the U1 three-phase inputs and to one phase of the U2 inputs
according to figure
47.
The voltage differential ST
ART 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.
11.6.5.2 Check of voltage differential trip and alarm levels
SEMOD175258-104 v3
Procedure
1. Connect voltages to the IED according to valid connection diagram and
figure
48.
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 203
Commissioning manual
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