Schweitzer Engineering Laboratories SEL-787, Instruction Manual, Page: 180 / 564

4.102
SEL-787 Relay Instruction Manual Date Code 20081022
Protection and Logic Functions
Front-Panel Settings (SET F Command)
Figure 4.70 shows the front-panel display for the entry in Table 4.55 . Input
IN101 is deasserted in this display (0), and the display changes to
INPUT
IN101=1
when Input IN101 asserts.
Figure 4.70 Front-Panel Display for an Entry in (a) Boolean Name and
Alias Strings and (b) Analog Name and User Text and Formatting Strings
If the engineering units are set, then the front-panel display shows the
engineering units. For example, in the Group setting example, we set
AI301EU to degrees C. With this setting, the front-panel display looks as
shown in
Figure 4.71 .
Figure 4.71 Front-Panel Display for an Entry in (a) Boolean Name and Alias
Strings and (b) Analog Name, User Text and Formatting Strings,
and Engineering Units
For fixed text, enter a 1 in the Name String, then enter the fixed text as the
alias text. For example, to display the word DEFAULT and SETTINGS on two
different lines, use a display point for each word, i.e., DP01 = 1,“DEFAULT”
and DP02 = 1,“SETTINGS.”
Table 4.56 shows other options and front-panel
displays for the User Text and Formatting settings.
Following is an example of an application of analog settings. Assume we also
want to know the hot-spot temperature, oil temperature, and winding
temperature of the transformer at a certain installation. To measure these
temperatures, we have installed an analog card in relay Slot
C , and connected
4–20 mA transducers inputs to analog inputs AI301 (hot-spot temperature),
AI302 (oil temperature), and AI303 (winding temperature).
First enable enough display points for the analog measurements (e.g.
EDP = 5).
Figure 4.72 shows the settings to add the three transducer
measurements. (Use the > character to move to the next settings category).
Table 4.56 Example Settings and Displays
Example Display Point Setting Value Example Display
AI301,"TEMP {4}deg C" TEMP 1234 deg C
AI301,"TEMP = {4.1}" TEMP =xx.x
AI301,"TEMP = {5}" TEMP = 1230
AI301,"TEMP={4.2,0.001} C" TEMP=1.23 C
AI301,"TEMP HV HS1={4,1000}" TEMP HV HS1=1234
1,{} Empty line
INPUT IN101:=0
TEMPERATURE:
0.024 mA
(a) Boolean
(b) Analog
INPUT IN101:=0
TEMPERATURE:
0.024 degree C
(a) Boolean
(b) Analog