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1MRK 505 378-UEN Rev. K
IEC07000106 V2 EN-US
Figure 47:
where:
1
2
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.
Repeat steps
Check of U2Low
Procedure
1.
Connect voltages to the IED according to valid connection diagram and figure 48.
Line differential protection RED670
Commissioning manual
UL1
UL2
UL3
UN
Connection of the test set to the IED for test of U1 block level
is three-phase voltage group1 (U1)
is three-phase voltage group2 (U2)
2
to
4
to check 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)
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Testing functionality by secondary injection
UL1
UL2
1
UL3
UN
UL1
2
UL2
UL3
IEC07000106-1-en.vsd
Section 11
SEMOD175258-91 v3
187
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