ABB RELION REX640 Technical Manual page 1206

Section 6
Supervision functions
1200
(+)
A
PSM100x.X2:4
PSM100x.X2:5
I
PODP1
PSM100x.X2:6
Rext
coil
PSM100x.X2:7
TCS
PODP1
PSM100x.X2:8
(-)
GUID-A341C961-7ACD-4F29-9B55-7ACEDFF5BA1B V1 EN
Figure 651: 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.
1MRS759142 C
+
B
BIO1002.X2:12
I
SP05
BIO1002.X2:11
Rext
coil
BIO1002.X2:14
TCS
SP06
BIO1002.X2:13
-
Technical Manual
REX640