12.6.5.1
Check of undervoltage levels
SEMOD175258-71 v2
This test is relevant if the setting
BlkDiffAtULow = Yes.
Check of U1Low
SEMOD175258-75 v3
Procedure
1.
Connect voltages to the IED according to valid connection diagram and figure
.
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.
UL1
UL2
UL3
UN
UL1
UL1
UL2
UL3
IE
D
T
E
S
T
S
E
T
IE
D
IEC07000106-1-en.vsd
UL2
UL3
UN
1
2
IEC07000106 V2 EN-US
Figure 60: Connection of the test set to the IED for test of U1 block level
where:
1
is three-phase voltage group1 (U1)
2
is three-phase voltage group2 (U2)
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
U1Low.
5.
U1Low for the other phases.
The connections to U1 must be shifted to test another phase. (UL1 to UL2,
UL2 to UL3, UL3 to UL1)
Check of U2Low
SEMOD175258-91 v3
Procedure
1.
Connect voltages to the IED according to valid connection diagram and figure
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
187
Commissioning manual