GE D30 Instruction Manual page 417

CHAPTER 6: ACTUAL VALUES
Generator
G
M
LOAD
Inductive Resistive
Generator
G
LOAD
Resistive
Resistive
Inductive
M
LOAD
G
Generator
Resistive
LOAD
G
Generator
6.3.1.2 UR convention for measuring phase angles
All phasors calculated by URs and used for protection, control and metering functions are rotating phasors that maintain
the correct phase angle relationships with each other at all times.
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 6-1: Flow direction of signed values for watts and VARs
Voltage
WATTS = Positive
VARS = Positive
PF = Lag
Current
UR RELAY
Voltage
WATTS = Positive
VARS = Negative
PF = Lead
Current
UR RELAY
-
2
Voltage
WATTS = Negative
VARS = Negative
PF = Lag
Current
UR RELAY
-
3
Voltage
WATTS = Negative
VARS = Positive
PF = Lead
Current
UR RELAY
827239AC.CDR
PER IEEE CONVENTIONS
PARAMETERS AS SEEN
BY THE UR RELAY
VCG
IC
-P
VAG
IB IA
VBG
-
1
VCG
IA
IC
-P
VAG
IB
VBG
VCG
IB
IA
VAG
-P
IC
VBG
VCG
IB
-P
VAG
IC
IA
VBG
-
4
METERING
+Q
PF = Lead PF = Lag
IA
+P
PF = Lag PF = Lead
-Q
S=VI
+Q
PF = Lead PF = Lag
+P
IA
PF = Lag PF = Lead
-Q
S=VI
+Q
PF = Lead PF = Lag
+P
IA
PF = Lag PF = Lead
-Q
S=VI
+Q
PF = Lead PF = Lag
IA
+P
PF = Lag PF = Lead
-Q
S=VI
6-11
6