ABB REX 521 Technical Reference Manual, Standard Configurations page 116

REX 521
0
1
Blocking signal from
the residual voltage relay
to Io>
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116
Protection Relay
Technical Reference Manual, Standard Configurations
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 chapter
3.3.-1 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.
CB
REX521
DC
ES
1MRS 751802-MUM
0
1
Breaker wear alarm
Circuit-breaker failure
protection
Blocking signal to the incoming feeder
(START 3I>>)
CLOSE circuit breaker
TRIP circuit breaker