If the binary input signal
>Trip relay
is not routed to a binary input of the device (information routing in
DIGSI 5), then the
Input sig. not routed
indication is generated and Trip-circuit supervision is no
longer in effect.
The following figure shows the logic diagram of the trip-circuit supervision with 1 binary input.
[lotcs1be-260912-01.tif, 1, en_US]
Figure 8-31
Logic Diagram of Trip-Circuit Supervision with 1 Binary Input
Equivalent Resistance R
The equivalent resistance R must be dimensioned such that the circuit-breaker coil is no longer activated when
the circuit breaker is open. Simultaneously, the binary input must still be activated when the command relay is
open.
In order to ensure the minimum voltage for activating the binary input, R
max
results in:
[fofr1b02-090330-01.tif, 1, en_US]
So that the circuit-breaker coil does not remain activated, R
min
results in:
[fofr1b03-090330-01.tif, 1, en_US]
You can calculate the optimal value for the equivalent resistance R from the 2 values R
min
and R
max
:
Supervision Functions
8.3 Supervision of the Secondary System
972 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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