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 98:
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
.
15.7.5.2
Check of voltage differential trip and alarm levels
Procedure
1.
Connect voltages to the IED according to valid connection diagram and
figure
.
Section 15
1MRK 502 029-UEN A
Verifying settings by secondary injection
196
Installation and commissioning manual
Summary of Contents for Relion 670 series
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