Sel SEL-787 - Figure 4.78 Adding Temperature Measurement Display Points; Table 4.59 Example Settings and Displays

4.104
SEL-787 Relay Instruction Manual Date Code 20150130
Protection and Logic Functions
Front-Panel Settings (SET F Command)
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 4.78 shows the settings to add the three transducer
measurements. (Use the > character to move to the next settings category).
Table 4.59 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
=>>SET F TERSE <Enter>
Front Panel
General Settings
DISPLY PTS ENABL (N,1-32) EDP := 4 ? 5 <Enter>
LOCAL BITS ENABL (N,1-32) ELB := 1 ? > <Enter>
•
•
•
Target LED Set
TRIP LATCH T_LED (Y,N) T01LEDL := Y ? > <Enter>
Display Point Settings (maximum 60 characters):
(Boolean): Relay Word Bit Name, "Alias", "Set String", "Clear String"
(Analog) : Analog Quantity Name, "User Text and Formatting"
DISPLAY POINT DP01 (60 characters)
DP01 := IN101,"TRFR 1 HV BRKR:",CLOSED,OPEN
? <Enter>
DISPLAY POINT DP02 (60 characters)
DP02 := IN102,"TRFR 1 LV BRKR:",CLOSED,OPEN
? <Enter>
DISPLAY POINT DP03 (60 characters)
DP03 := IAV, "IAV CURR {5} A"
? AI301,"HOT SPOT TEMP" <Enter>
DISPLAY POINT DP04 (60 characters)
DP04 := IG_MAG, "GND CURR {5} %"
? AI302,"OIL TEMPERATURE" <Enter>
DISPLAY POINT DP05 (60 characters)
DP05 := IA_MAG, "IA {7.1} A pri"
? AI303,"WINDING TEMP" <Enter>
Save changes (Y,N)? Y <Enter>
Settings Saved
=>>
Figure 4.78 Adding Temperature Measurement Display Points