4.115
Date Code 20100129 Instruction Manual SEL-751A Relay
Protection and Logic Functions
Front-Panel Settings (SET F Command)
When the HV breaker opens (LV breaker is still closed), the relay removes the
line containing the HV breaker information because the Clear String
information was omitted. Because the line containing the HV breaker
information is removed, the relay now displays the LV breaker information on
the top line, as shown in Figure 4.66.
Figure 4.65 Front-Panel Display—Both HV and LV Breakers Closed
Figure 4.66 Front-Panel Display—HV Breaker Open, LV Breaker Closed
If you want the relay to display a blank state when IN101 deasserts instead of
removing the line altogether, use the curly brackets {} for the Clear String, as
follows:
DP01 := RID, “{16}”
? IN101,"TRFR 1 HV BRKR:",CLOSED,{} <Enter>
When Input IN101 now deasserts, the relay still displays the line with the HV
breaker information, but the state is left blank, as shown in Figure 4.67.
Figure 4.67 Front-Panel Display—HV Breaker Open, LV Breaker Closed
Name Only
Table 4.62 shows an entry in the Name String only (leaving the Alias string,
Set String, and Clear String void), using the SET F command as follows:
DP01 := RID, “{16}”
? IN101 <Enter>
Figure 4.68 shows the front-panel display for the entry in Table 4.62. Input
IN101 is deasserted in this display (
IN101=0), but changes to IN101=1 when
Input IN101 asserts.
Figure 4.68 Front-Panel Display for a Binary Entry in the Name String Only
Analog Display Point Entry Composition
In general, the legal syntax for analog display points consists of the following
two fields or strings:
Name, “User Text and Formatting.”
TRFR 1 HV BRKR:= CLOSED
TRFR 1 LV BRKR:= CLOSED
TRFR 1 LV BRKR:= CLOSED
TRFR 1 HV BRKR:=
TRFR 1 LV BRKR:= CLOSED
Table 4.62 Binary Entry in the Name String Only
Name Alias Set String Clear String
IN101———
IN101=0
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