4.59
Date Code 20081022
Instruction Manual
SEL-787 Relay
Protection and Logic Functions
Voltage-Based Protection
EPWR := 3P1 enables one three-phase power element. Set EPWR := 3P2 if
you want to use both elements.
Set the element pickup, 3PH PWR ELEM PU to desired values.
shows the power element logic diagram and
in the Real/Reactive power plane.
Figure 4.37
Three-Phase Power Elements Logic
Table 4.21
Power Element Settings
Setting Prompt
Setting Range
Setting Name :=
Factory Default
ENABLE PWR ELEM
N, 3P1, 3P2
EPWR := N
3PH PWR ELEM PU
OFF, 1.0–6500.0 VA
a
a
The range shown is for 5 A input; range for 1 A input is OFF, 0.2—1300.0 VA.
3PWR1P := OFF
PWR ELEM TYPE
+WATTS, –WATTS,
+VARS, –VARS
PWR1T := +VARS
PWR ELEM DELAY
0.0–240.0 s
PWR1D := 0.0
3PH PWR ELEM PU
OFF, 1.0–6500.0 VA
3PWR2P := OFF
PWR ELEM TYPE
+WATTS, –WATTS,
+VARS, –VARS
PWR2T := +VARS
PWR ELEM DELAY
0.0–240.0 s
PWR2D := 0.0
PWRnD
0
3PWRnP
|VAB|
20 V
3PWRnT
Relay
Word
Bits
Switch A
Position
+WATTS
–WATTS
+VARS
–VARS
Setting
PWRnT
1
1
2
2
Switch B
Position
1
2
1
2
Where n = 1 or 2
2 Cycle
Average
•(–1)
Switch A
Switch B
1
1
2
2
3PWRnP
|VBC|
Setting
P
Q
Summary of Contents for SEL-787
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