GE 750 Instruction Manual page 242

750/760
Feeder Management Relay
6–8
system cycle and perform protection and monitoring functions. Displayed metered
quantities are updated approximately three (3) times a second for readability. All
phasors and symmetrical components are referenced to the A-N voltage phasor for
wye-connected VTs; to the A-B voltage phasor for delta-connected VTs; or to the
phase A current phasor when no voltage signals are present.
ONE LINE DIAGRAM
I
2
I
3
SOURCE
PER IEEE DEFINITIONS
PHASOR DIAGRAM
(POSITIVE ROTATION)
S2
- Watt
- Var
PF=Lag
I
2
4
I
S3
3
- Watt
+ Var
PF=Lead
= Angle By Which Voltage Leads Current
4
FIGURE 6–3: Power Quantity Relationships
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I
1
I
4
POSITIVE
DIRECTION
LOAD
RELAY
S2=E
S3=E
S1
+ Watt
- Var
PF=Lead
I
1
Bus Voltage E
I
4 S4
+ Watt
+ Var
PF=Lag
A2 Metering
POWER PLANE DIAGRAMS
+Q
P1
-P +P
Q1
^
I 1
S1=E
-Q
+Q
P2
-P +P
Q2
^
I 2
-Q
+Q
^
I 3
Q3
P3
-P +P
-Q
+Q
^
I 4
S4=E
Q4
4
-P +P
P4
-Q
818773AC.CDR
GE Multilin