P.12.26
SEL-411L Relay Protection Manual Date Code 20151029
Bay Control
Bay Control Front-Panel Operations
The following example shows the process of changing a three-position
disconnect from closed in-line to closed to ground. This process requires that
you first open the in-line disconnect before you can close the ground
disconnect.
Starting with the one-line diagram in Figure 12.16, highlight the three-
position disconnect and press the ENT pushbutton. If the LOCAL Relay Word
bit is asserted, the control screen shown in Figure 12.15 (b) is displayed on the
screen. Note that the only options at this point are to open or close Disconnect
SW3. Therefore, use the Up Arrow or Down Arrow pushbutton to move the
highlight box to the
OPEN SW3 position. Then press the ENT pushbutton to open
Disconnect SW3. If Disconnect SW3 successfully opens, the control screen
will change as shown in Figure 12.15 (a). Note that the control actions
changed so that Disconnect SW4 can now be closed. At this point, use the
Up Arrow or Down Arrow pushbutton to move the highlight box to the
CLOSE SW4
position and press the ENT pushbutton to close Disconnect SW4. If disconnect
SW4 is successfully closed the control screen will change as show in
Figure 12.15 (c).
Disconnect SW3: Open
Disconnect SW4: Alarm
OPENED
UNKNOWN
SW3
SW4
CLOSE
OPEN
CLOSE
NO CONTROL for either disconnect
Disconnect SW3: Alarm
Disconnect SW4: Open
UNKNOWN
OPENED
SW3
SW4
CLOSE
OPEN
CLOSE
NO CONTROL for either disconnect
Disconnect SW3: Closed
Disconnect SW4: Alarm
CLOSED
UNKNOWN
SW3
SW4
CLOSE
OPEN
CLOSE
NO CONTROL for either disconnect
Disconnect SW3: Alarm
Disconnect SW4: Closed
UNKNOWN
CLOSED
SW3
SW4
CLOSE
OPEN
CLOSE
NO CONTROL for either disconnect
Disconnect SW3: Closed
Disconnect SW4: Closed
CLOSED
CLOSED
SW3
SW4
CLOSE
OPEN
CLOSE
NO CONTROL for either disconnect
Disconnect SW3: Alarm
Disconnect SW4: Alarm
UNKNOWN
UNKNOWN
SW3
SW4
CLOSE
OPEN
CLOSE
NO CONTROL for either disconnect
a
See Figure 12.15 (a).
b
See Figure 12.15 (b).
c
See Figure 12.15 (c).
Table 12.5 Three-Position Disconnect Switch Control Screen Status and Control Options (Sheet 2 of 2)
State of Disconnects Status Displayed Control Options Displayed Control Actions Available
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