Application - ABB RELION SMU615 Technical Manual

1MRS758407 C
Figure 86: Functional module diagram
TCS status
This module receives the trip circuit status from the hardware. A detected failure in
the trip circuit activates the timer.
Timer
Once activated, the timer runs until the set value of
The time characteristic is according to DT. 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 0.5 s reset timer is activated.
After that time, the operation timer is reset.
The BLOCK input can be controlled with a binary input, a horizontal communication
input or an internal signal of the merging unit's program. The activation of the
BLOCK input prevents the ALARM output to be activated.
5.1.5

Application

TCSSCBR detects faults in the electrical control circuit of the circuit breaker. The
function can supervise both open and closed coil circuits. This supervision is
necessary to find out the vitality of the control circuits continuously.
Figure 87
solution is to connect an external R
breaker internal contact. Although the circuit breaker internal contact is open, TCS
can see the trip circuit through R
that the current through the resistance remains small, that is, it does not harm or
overload the circuit breaker's trip coil.
SMU615
Technical Manual
shows an application of the trip circuit supervision function use. The best
Operate delay time has elapsed.
shunt resistor in parallel with the circuit
ext
. The R resistor should have such a resistance
ext ext
Supervision functions
135