7
3
Measuring
3.1
Measured quantities
Prefix
Quantity
Calculation
System / Phase
I
Input current
(I1+I2+I3)/3
System
I1
Phase current L1
L1
I2
Phase current L2
L2
I3
Phase current L3
L3
U
Input voltage
(U1+U2+U3)/3
System
U1
L1 Phase voltage
L1
U2
L2 Phase voltage
L2
U3
L3 Phase voltage
L3
P
Active power
P1+P2+P3
System
P1
Active power L1
L1
P2
Active power L2
L2
P3
Active power L3
L3
Q
Reactive power
Q1+Q2+Q3
System
Q1
Reactive power L1
L1
Q2
Reactive power L2
L2
Q3
Reactive power L3
L3
S
Apparent power
S1+S2+S3
System
S1
Apparent power L1
L1
S2
Apparent power L2
L2
S3
Apparent power L3
L3
U12
Main voltageL1-L2
L1 - L2
U23
Main voltage L2-L3
L2 - L3
U31
Main voltage L3-L1
L3 - L1
PF
Active power factor
P/S
System
PF1
Active power factor
COS(φ1)=P1/S1
L1
PF2
Active power factor
COS(φ2)=P2/S2
L2
PF3
Active power factor
COS(φ3)=P3/S3
L3
QF
Reactive power factor
Q/S
System
QF1
Reactive power factor
SIN(φ1)=Q1/S1
L1
QF2
Reactive power factor
SIN(φ2)=Q2/S2
L2
QF3
Reactive power factor
SIN(φ3)=Q3/S3
L3
LF
LF factor
sign(Q)*(1-|PF|)
System
LF1
LF factor
sign(Q1)*(1-|PF1|)
L1
LF2
LF factor
sign(Q2)*(1-|PF2|)
L2
LF3
LF factor
sign(Q3)*(1-|PF3|)
L3
PA
Phase angel
PA=(PA1+PA2+PA3)/3
System
PA1
Phase angel
φ1=ARCCOS(P1/S1)/PI*180*sign(P1) L1
PA2
Phase angel
φ2=ARCCOS(P2/S2)/PI*180*sign(P2) L2
PA3
Phase angel
φ3=ARCCOS(P3/S3)/PI*180*sign(P3) L3
IS
Input current with sign
(IS1+IS2+IS3)/3
System
IS1
Phase current with sign
I1*sign(P1)
L1
IS2
Phase current with sign
I2*sign(P2)
L2
IS3
Phase current with sign
I3*sign(P3)
L3
P_I1_U12
Active power, System connection-02
System
P_I1_U23
Active power, System connection -03
System
P_I1_U31
Active power, System connection -04
System
Q_I1_U12
Reactive power, System connection -02
System
Q_I1_U23
Active power, System connection -03
System
Q_I1_U31
Active power, System connection -04
System
F
Frequency
System
