
VA
VB
VC
VN
VA
VA
VB
VC
IE
D
T
E
S
T
S
E
T
IE
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.
to
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
Содержание RELION RET670
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