Breaker Close/Trip Circuit Monitoring Tcsscbr - ABB REL650 Applications Manual

1MRK 506 334-UUS A
10.3
10.3.1
10.3.2
Application manual
Set the IDLDPU with a sufficient margin below the minimum expected load current. A
safety margin of at least 15-20% is recommended. The operate value must however
exceed the maximum charging current of an overhead line, when only one phase is
disconnected (mutual coupling to the other phases).
Set the VDLDPU with a sufficient margin below the minimum expected operating
voltage. A safety margin of at least 15% is recommended.

Breaker close/trip circuit monitoring TCSSCBR

Identification
Function description
Breaker close/trip circuit monitoring
Application
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
breaker internal contact. Although the circuit breaker internal contact is open, TCSSCBR
can see the trip circuit through R
current through the resistance remains small, that is, it does not harm or overload the
circuit breaker's trip coil.
Secondary system supervision
IEC 61850 IEC 60617
identification identification
TCSSCBR -
shunt resistor in parallel with the circuit
ext
. The R resistor should have such a resistance that the
ext ext
Section 10
ANSI/IEEE C37.2
device number
-
281