Sel 411L - Page 776

P.12.16
SEL-411L Relay Protection Manual Date Code 20151029
Bay Control
Bay Control Front-Panel Operations
The one-line diagram indicates highlighted text with a box around the current
selection.
Circuit Breaker and
Disconnect Switch
Operations From the
Front Panel
Circuit Breaker Open/Close
The relay supports either three-pole operations or single-pole operations.
Following is a description of the control screens when the relay is set to three-
pole operations.
Figure 12.8 (a) shows the breaker control screens available after pressing the
ENT pushbutton, with the circuit breaker highlighted (Only highlighted
breakers on the one-line diagram can initiate breaker open or close
operations). Pressing the ENT pushbutton with the breaker highlighted and the
LOCAL Relay Word bit asserted displays the breaker control screen in
Figure 12.8 (b). After you enter the screen in Figure 12.8 (b), the relay
performs the circuit breaker operations as described in Figure 12.8. If the
LOCAL Relay Word bit is not asserted when the ENT pushbutton is pressed,
the relay displays the screen in Figure 12.8 (c) for four seconds and then
returns to the screen in Figure 12.8 (a).
Disconnect operation in progress, not
highlighted
b
89OIPm
Disconnect operation in progress,
highlighted
c
89OIPm
a
When the disconnect switch is highlighted and no operation is in progress, a square box
alternately frames the switch symbol.
b
For a disconnect switch operation in progress where the disconnect switch is not highlighted,
the symbol displayed is the present state symbol and then the opposite state symbol. This
sequence repeats until the disconnect switch operation completes.
c
For a disconnect switch operation in progress where the disconnect is highlighted, the symbol
displayed is the present state symbol, then the present state symbol highlighted, then the
opposite state symbol, and finally the opposite state symbol highlighted. This sequence
repeats until the disconnect switch operation completes.
Table 12.3 Disconnect Switch State Representations (Sheet 2 of 2)
Apparatus Position Symbol
Asserted
Relay Word Bit