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
Figure 19:
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
.
10.5.4.2
Check of voltage differential trip and alarm levels
Procedure
1.
Connect voltages to the IED according to valid connection diagram and
figure
.
1MRK 511 360-UEN A
Section 10
Testing functionality by secondary injection
Bay control REC670 2.1 IEC
123
Commissioning manual
