ABB RET670 - Page 226

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
Figure 50: 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)
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
220 Transformer protection RET670 2.2 ANSI
Commissioning manual