Hitachi Relion 670 Series Commissioning Manual page 191

1MRK506371-UUS Rev. M
11.6.5.2 Check of undervoltage levels
This test is relevant if the setting BlkDiffAtVLow = Yes.
Check of V1Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure 47.
2. Apply voltage higher than the highest set value of VDTrip, V1Low and V2Low to the V1 three-phase
inputs and to one phase of the V2 inputs according to figure 47.
The voltage differential PICKUP signal is set.
ANSI07000106 V2 EN-US
Figure 47:
where:
1
2
3. Decrease slowly the voltage in phase VA of the test set until the PICKUP signal resets.
4. Check V1 blocking level by comparing the voltage level at reset with the set undervoltage blocking
V1Low.
5. Repeat steps
Check of V2Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure 48.
Line distance protection REL670
Commissioning manual
VA
VB
VC
VN
Connection of the test set to the IED for test of V1 block level
is three-phase voltage group1 (V1)
is three-phase voltage group2 (V2)
2 to 4 to check V1Low for the other phases.
The connections to V1 must be shifted to test another phase. (VA to VB, VB to VC, VC to
VA)
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Testing functionality by secondary injection
VA
VB
1
VC
VN
VA
2
VB
VC
ANSI07000106-1-en.vsd
Section 11
SEMOD175258-71 v2
SEMOD175258-75 v3
SEMOD175258-91 v3
185