3.60
SEL-351-5, -6, -7 Relay
Instruction Manual
Date Code 20070117
Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements
Power Elements (Available in Firmware Version 7)
Figure 3.37
Three-Phase Power Elements Logic
Figure 3.38
Power Elements Operation in the Real/Reactive Power Plane
, an example is shown with setting PWR
n
T = +VARS. This
corresponds to the settings PWR1P (pickup) and PWR1T (type) in
2
1
Switch A
2-Cycle
Average
2
Switch B
• (—1)
1
Switch A
Position
+WATTS
—WATTS
+VARS
—VARS
Setting
PWRnT
1
1
2
2
Switch B
Position
1
2
1
2
Where n = 1, 2, 3, or 4
40 V
|V
BC
|
|V
AB
|
Reactive Power
(Three-Phase)
Real Power
(Three-Phase)
Multiply by —1
Sufficient Signal
Setting
3PWRn
3PWRnP
Relay
Word
Bits
PWRnD
0
Reactive
Power
Reactive
Power
Real
Power
Real
Power
PWR2P
(pickup)
PWR1P
(pickup)
PWR3P
(pickup)
PWR4P
(pickup)
Set as Reactive Power Elements
Reverse
(Leading)
PWRA2
PWRB2
PWRC2
PWRA1
PWRB1
PWRC1
PWRA4
PWRB4
PWRC4
PWRA3
PWRB3
PWRC3
Forward
(Lagging)
Set as Real Power Elements
Reverse
Forward
SEL-351
52
SEL-351
52
PWR1T =
+VARS
(type)
PWR2T =
—VARS
(type)
PWR4T =
—WATTS
(type)
PWR3T =
+WATTS
(type)
Summary of Contents for SEL-351-5
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