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9.2
Breaker close/trip circuit monitoring TCSSCBR
GUID-6D9DE533-EC57-4517-955E-075851E1C89A v1
9.2.1
Identification
GUID-C6367ACC-A594-4C2C-B75A-8A62387117BB v5
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker close/trip circuit monitoring
TCSSCBR
-
-
9.2.2
Application
GUID-D28727C2-FF93-4E3A-BD92-9B85D1F653DC v10.1.1
TCSSCBR detects faults in the electrical control circuit of the circuit breaker. The function can
supervise both open and closed coil circuits. This kind of monitoring is necessary to find out the
vitality of the control circuits continuously.
Trip circuit supervision generates a current of approximately 1.0 mA through the
supervised circuit. It must be ensured that this current will not cause a latch up of
the controlled object.
To protect the trip circuit supervision circuits in the IED, the output contacts are
provided with parallel transient voltage suppressors. The breakdown voltage of
these suppressors is 400 +/– 20 V DC.
The following figure shows an application of the trip-circuit monitoring function usage. The best
solution is to connect an external R
ext
shunt resistor in parallel with the circuit breaker internal
contact. Although the circuit breaker internal contact is open, TCSSCBR can see the trip circuit
through R
ext
. The R
ext
resistor should have such a resistance that the current through the
resistance remains small, that is, it does not harm or overload the circuit breaker's trip coil.
1MRK 505 287-UUS B
Section 9
Secondary system supervision
Busbar protection REB650
109
Application manual
© Copyright 2013 ABB. All rights reserved
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