ABB Relion 670 Series Technical Reference Manual page 549

1MRK505222-UUS C
VDTrip_A
VDTrip_B
VDTrip_C
VDAlarm_A
VDAlarm_B
VDAlarm_C
V1Low_A
V1Low_B
V1Low_C
BlkDiffAtULow
V2Low_A
V2Low_B
V2Low_C
BLOCK
ANSI06000382 V3 EN
Figure 277: Principle logic for Voltage differential function VDCPTOV (60)
Technical reference manual
VDCPTOV (60) function can be blocked from an external condition with the binary
BLOCK input. It can for example, be activated from Fuse failure supervision function
SDDRFUF.
To allow easy commissioning the measured differential voltage is available as service
value. This allows simple setting of the ratio correction factor to achieve full balance in
normal service.
The principle logic diagram is shown in figure 277.
0-tAlarm
AND
0
OR
0-t1
AND
0
AND
O
AND
R
0-tReset
AND
AND
O
0-tAlarm
AND
R
AND
AND
Section 8
Voltage protection
0-tTrip
0
AND
0
AND
AND
0
AND
AND
en06000382_2_ansi.vsd
TRIP
PICKUP
ALARM
V1LOW
V2LOW
543