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 61: 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
.
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.
12.6.5.2
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
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
188
Commissioning manual