VA
VB
VC
VN
VA
VA
VB
VC
I
E
D
T
E
S
T
S
E
T
I
E
D
ANSI07000106-1-en.vsd
VB
VC
VN
1
2
ANSI07000106 V2 EN
Figure 48: Connection of the test set to the IED for test of V1 block level
where:
1 is three-phase voltage group1 (V1)
2 is three-phase voltage group2 (V2)
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
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)
Check of V2Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure 49.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
218 Transformer protection RET670 2.2 ANSI
Commissioning manual
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