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Section 10
Testing functionality by secondary injection
176
UL1
UL2
UL3
UN
IEC07000106 V2 EN
Figure 37:
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.
Repeat steps
2
to
4
The connections to U1 must be shifted to test another phase.
(UL1 to UL2, UL2 to UL3, UL3 to UL1)
Check of U2Low
Procedure
1.
Connect voltages to the IED according to valid connection diagram and
figure 38.
to check U1Low for the other phases.
1MRK 506 355-UEN A
UL1
UL2
1
UL3
UN
UL1
2
UL2
UL3
IEC07000106-1-en.vsd
Line distance protection REL670 2.1 IEC
Commissioning manual
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