P.7.8
SEL-411L Relay Protection Manual Date Code 20151029
Front-Panel Operations
Front-Panel Layout
Figure 7.7 Clear Alarm Point Confirmation Screen
In the case that all alarms are deasserted, pressing the ENT
pushbutton will allow the user to acknowledge and clear all alarms.
After clearing, a screen showing the results of the action will be
shown, as in Figure 7.8.
Figure 7.8 No Alarm Points Screen
Alarm points are not updated for a particular element if it has been
deleted from the SER as a result of chatter criteria (see Automatic
Deletion and Reinsertion on page P.8.33). Upon reinsertion, the
element state will be updated on the alarm point display. If the relay
enters a period of SER data loss, the status of alarm points cannot be
determined. The screen shown in Figure 7.9 will appear until you exit
the data loss condition, at which point the alarm point elements will
be polled and displayed if asserted. Subsequent alarm point
assertions will be displayed above the data loss message.
Figure 7.9 Alarm Points Data Loss Screen
Display Points
You can display messages on the front-panel LCD that indicate conditions in
the power system. The relay uses display points to place these messages on the
LCD.
Figure 7.10 shows a sample display points screen. Display points can show
the status of Relay Word bits or display the value of analog quantities. The
relay has 96 possible display points; Table 7.4 and Table 7.5 list the display
points settings. The relay updates the display points data once per second if
you are viewing the display points in manual-scrolling mode; in autoscrolling
mode the relay updates the display points information each time the screen
appears in the
ROTATING DISPLAY sequence.
Circuit BK1 SF6 Gas
ALARM POINTS
Press to acknldge
Are you sure you
want to clear
inactive alarms?
Press to clear
NO ALARM POINTS
EXIST.
ALARM POINTS
##SER DATA LOSS##
ALARM POINTS
Press to acknldge
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