ABB Relion 650 Series Applications Manual page 116

Section 9
Secondary system supervision
IS: Constant current generator.
V: Transient Voltage Suppressor
PO1
TCS1
HW
S W
GUID-B056E9DB-E3E5-4300-9150-45916F485CA7 V2 EN-US
Figure 38: Operating principle of the trip-circuit supervision with an external resistor. The
If the TCSSCBR is required only in a closed position, the external shunt resistance may be omitted.
When the circuit breaker is in the open position, the TCSSCBR sees the situation as a faulty circuit.
One way to avoid TCSSCBR operation in this situation would be to block the monitoring function
whenever the circuit breaker is open.
110
Current level ~ 1,0 mA (I )
c
Breakdown Voltage 380 to 400 VDC
V
I
c
IS
TCSSCBR
TCS_STATE ALARM
BLOCK
TCSSCBR blocking switch is not required since the external resistor is used.
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R ext
(-)
PSM
1
2
(+)
1MRK 505 287-UUS B
Rs
IEC13000025-2-en.vsd
Busbar protection REB650
Application manual