VA
VB
VC
VN
VA
VA
VB
VC
I
E
D
T
E
S
T
S
E
T
I
E
D
ANSI07000108-1-en.vsd
VB
VC
VN
1
2
ANSI07000108 V2 EN-US
Figure 53: Connection of the test set to the IED for test of alarm levels, trip levels and trip
timer
where:
1 is three-phase voltage group1 (V1)
2 is three-phase voltage group2 (V2)
2. Apply 1.2 · Vn (rated voltage) to the V1 and V2 inputs.
3. Decrease slowly the voltage of in phase VA of the test set until the ALARM signal is activated.
The ALARM signal is delayed with timer
tAlarm
4. Check the alarm operation level by comparing the differential voltage level at ALARM with the set
alarm level VDAlarm.
5. Continue to slowly decrease the voltage until PICKUP signal is activated.
6. Check the differential voltage operation level by comparing the differential voltage level at PICKUP
with the set trip level VDTrip.
7. Repeat steps
1 to 6 to check the other phases.
Observe that the connections to V1 must be shifted to test another phase. (VA to VB, VB to VC, VC
to VA)
11.6.5.4 Check of trip and trip reset timers
SEMOD175258-124 v2
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure
53.
2. Set Vn (rated voltage) to the V1 inputs and increase V2 voltage until the differential voltage is 1.5 ·
operating level (VDTrip).
3. Switch on the test set. Measure the time from activation of the PICKUP signal until TRIP signal is
activated.
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
212 Transformer protection RET670
Commissioning manual
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