Section 7 Supervision functions
7.1 Trip circuit supervision TCSSCBR
7.1.1 Identification
Table 77: Function identification
IEC 61850 identification: TCSSCBR
IEC 60617 identification: TCS
ANSI/IEEE C37.2 device number: TCM
7.1.2 Functionality
The trip circuit supervision function (TCSSCBR) is designed for supervision
purposes of control circuits. The invalidity of a control circuit is detected by using a
dedicated output contact that contains the supervision functionality.The failure of a
circuit is reported to the corresponding function block in the IED configuration.
The function starts and operates when TCS detects a trip circuit failure. The operate
time characteristic for the function is of DT type. The function operates after a
predefined operating time and resets when the fault disappears.
The function contains a blocking functionality. Blocking deactivates the ALARM
output and resets the timer.
7.1.3 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 supervision is
necessary to find out the vitality of the control circuits continuously.
The following figure shows an application of the trip-circuit supervision 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, TCS 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.
1MRS756378 D Section 7
Supervision functions
REF615 187
Application Manual
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