Supervision Functions
PRS-7367 243
The function contains a blocking functionality. The activation of the TCS_Blk input deactivates the
TCS_Alm output and resets the internal timers.
The operating time characteristic for the function is DT. Once activated, the timer runs until the set
value of TCS_Op_T has elapsed. When the operation timer has reached the maximum time value,
the ALARM output is activated. If a drop-off situation occurs during the operate time up counting,
the fixed 200 ms reset timer is activated. After that time, the operation timer resets.
4.5.3 TCS Application Scope
TCS 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 circuit breaker coil current is normally cut by an internal contact of the circuit breaker. In case
of a circuit breaker failure, there is a risk that the protection trip contact is destroyed. An auxiliary
relay can be used between the protection IED trip contact and the circuit breaker coil. This way the
breaking capacity question is solved, but the TCS circuit in the protection device monitors the
healthy auxiliary relay coil, not the circuit breaker coil. The separate trip circuit supervision relay is
applicable for this to supervise the trip coil of the circuit breaker.
4.5.4 TCS Settings
Table 4.5-3 TCS settings
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