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 28:
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
.
11.5.4.3
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 11
1MRK 511 403-UEN Rev. L
Testing functionality by secondary injection
126
Bay control REC670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Содержание REC670
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