ABB RELION REX640 - Page 1305

PSM100x.X2:5
PSM100x.X2:4
PSM100x.X2:6
(+) +
(-)
BIO1002.X2:12
-
BIO1002.X2:11
PODP1
SP05
I
I
A B
PSM100x.X2:7
PSM100x.X2:8
TCS
PODP1
Rext
coil
BIO1002.X2:14
BIO1002.X2:13
TCS
SP06
Rext
coil
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.
1MRS759142 F
Supervision functions
REX640
Technical Manual
1305