1MRS751802-MUM
REX 521
145
Protection Relay
Technical Reference Manual, Standard Configurations
The Alarm 1 signal is then connected to an output relay via
Main menu\Configuration\Output Signals\
, and in this example, the
breaker wear alarm signal is connected to the signal output 1, SO1.
9.1.5.6.
Disconnector and earth-switch indication
If the status indication signals are available from the disconnector or the earth
switch, they can be connected to the digital inputs for indication sent as events to a
monitoring system or to include in the interlocking scheme for close-operation of the
breaker. These settings can be found in:
Main menu\Configuration\Input
Signals\
.
The status indication signals for the disconnector are named as “DC pos. open” and
“DC pos. close” and for the earth switch as “ES pos. open” and “ES pos. close”. In
this example, the disconnector indication signals are connected to the inputs DI3
(open) and DI4 (close). The earth-switch indication is connected to the inputs DI5
(open) and DI6 (close).
With these indication signals, it is possible to prevent or give permission for the
closing of the breaker. The different interlocking options are described in Section
5.2. Interlocking. In this example, the interlocking option “Interlocking_B” is used.
This option allows closing of the breaker only when the disconnector is closed and
the earth switch is open. The different interlocking options can be set in
Main menu\Configuration\Input Signals\Close enable
.
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