ABB Relion 650 Series Applications Manual page 117

1MRK 505 287-UUS B
IS: Constant current generator.
V: Transient Voltage Suppressor
Breakdown Voltage 380 to 400 VDC
PO1
TCS1
HW
S W
CBPOS_open
GUID-6B09F9C7-86D0-4A7A-8E08-8E37CAE53249 V3 EN-US
Figure 39: Operating principle of the trip-circuit supervision without an external resistor.
Trip-circuit monitoring 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.
GUID-7264738C-F9D7-48F0-B6FC-F85FD10D5B84 V1 EN-US
Figure 40: Constant test current flow in parallel trip contacts and trip-circuit supervision
Busbar protection REB650
Application manual
Current level ~ 1,0 mA (I )
c
V
I
c
IS
TCSSCBR
TCS_STATE ALARM
BLOCK
The circuit breaker open indication is set to block TCSSCBR when the circuit
breaker is open.
© Copyright 2013 ABB. All rights reserved
(-)
PSM
1
2
(+)
Section 9
Secondary system supervision
Rs
IEC13000026-2-en.vsd
111