P.7.11
Date Code 20151029 Protection Manual SEL-411L Relay
Front-Panel Operations
Front-Panel Layout
mode line editing commands to set the display points (see Text-Edit Mode
Line Editing on page P.10.18 for information on text-edit mode line editing).
To delete Display Point 1, type DELETE <Enter> at the front-panel settings
Line 1 prompt.
EXAMPLE 7.2 Creating a Display Point
Display points screens provide operator feedback about the readiness
of equipment connected to the relay. A display points screen contains
11 display points; this example demonstrates a method to set the
display point messages that are shown in Figure 7.10. The relay in this
example has an additional I/O interface board.
This example is based on a three-pole circuit breaker. The Relay Word
bit 52AA1 will assert when Circuit Breaker 1 is in the closed position.
IN209 will assert when Circuit Breaker 1 is in an alarm condition.
B2IAFIM is the filtered instantaneous magnitude for the A-phase
current through Circuit Breaker 2.
In the front-panel settings (SET F), enter the following after the
Display Points and Aliases line 1 prompt:
1: 1,”Circuit Breaker 1”
2: 52AA1,,“ --Closed--”,“ --Open--”
3: 0
4: 0,”Circuit BK1 SF6 Gas”
5: IN209,,” --Alarm--”,” --Normal--”
6: 1
7: 1,”Circuit Breaker 2”
8: B2IAFIM,” A PH={6.1,1} A pri”
9: IN209,,”SF6 ALARM”, D
Fixed text is set by assigning an alias to a “1” or “0.” Blank lines are
set by assigning a blank alias to a “1” or “0.” The circuit breaker
closed condition is indicated by the set state, “ --Closed--” where
leading spaces are added to center the set state message. Add a clear
state named “ --Open--” to show that the circuit breaker is open. The
circuit breaker alarm condition is indicated by the set state,
“ --Alarm--” where leading spaces are added to center the set state
message. Add a clear state named “ --Normal--” to show that the
circuit breaker is not in alarm. User text “ A PH=” and “A pri” allows
for customized display of the Circuit Breaker 2 A-phase current, which
has been formatted to display numerically as XXXX.X. Double font
display is used to give greater visibility to the SF6 Alarm. A horizontal
scroll appears while in manual-scrolling mode regardless of whether
or not the display point label width requires two full screens to
display.
EXAMPLE 7.3 Monitoring Test Modes With Display Points
This example uses the Relay Word bit TESTFM (Fast Meter test
running) to activate a front-panel display point that alerts an on-site
operator that the relay is in Fast Meter test mode.
In the front-panel settings (SET F), enter the following after the line 10
prompt:
10: TESTFM,,“FAST METER TEST!!!!”
The LCD displays the screen shown in Figure 7.11 as a part of the
ROTATING DISPLAY if the Fast Meter test is running. (Instruct the
operator to view the relay front panel for messages or warnings as
the last item on a “Leaving the Substation” checklist.)
Again, this display point application example does not require a clear
state, so the clear state is blank. If the Fast Meter test is not running
and no other display points are active, the relay shows a blank screen
in the ROTATING DISPLAY.
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