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Using power output contacts without trip circuit supervision
If TCS is not used but the contact information of corresponding power outputs are
required, the internal resistor can be by-passed. The output can then be utilized as a
normal power output. When bypassing the internal resistor, the wiring between the
terminals of the corresponding output X100:16-15(PO3) or X100:21-20(PO4) can be
disconnected. The internal resistor is required if the complete TCS circuit is used.
Figure 91: Connection of a power output in a case when TCS is not used and the
internal resistor is disconnected
Incorrect connections and use of trip circuit supervision
Although the TCS circuit consists of two separate contacts, it must be noted that
those are designed to be used as series connected to guarantee the breaking
capacity given in the technical manual of the merging unit. In addition to the
weak breaking capacity, the internal resistor is not dimensioned to withstand
current without a TCS circuit. As a result, this kind of incorrect connection causes
immediate burning of the internal resistor when the circuit breaker is in the close
position and the voltage is applied to the trip circuit. The following figure shows
incorrect usage of a TCS circuit when only one of the contacts is used.
1MRS758407 C
Supervision functions
SMU615
Technical Manual
141
Summary of Contents for Relion SMU615
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