ABB RELION REX640 Technical Manual page 1305

1MRS759142 F
A
PSM100x.X2:5
PODP1
PSM100x.X2:6
PSM100x.X2:7
PODP1
PSM100x.X2:8
Figure 740: Operating principle of the trip-circuit supervision, double-pole
connection
Trip circuit supervision and other trip contacts
It is typical that the trip circuit contains more than one trip contact in parallel, for
example in transformer feeders where the trip of a Buchholz relay is connected
in parallel with the feeder terminal and other relays involved. The supervising
current cannot detect if one or all the other contacts connected in parallel are not
connected properly.
REX640
Technical Manual
(+)
PSM100x.X2:4
I
Rext
coil
TCS
(-)
Supervision functions
+
B
BIO1002.X2:12
SP05
I
BIO1002.X2:11
coil
BIO1002.X2:14
TCS
SP06
BIO1002.X2:13
-
Rext
1305