Measurands; Operational Measured Quantities Depending On The Connection Types - Siemens SICAM 7KG85X Manual

Basic Functions
2.5 AC Measurement

Measurands

2.5.4
2.5.4.1

Operational Measured Quantities Depending on the Connection Types

Table 2-13
Measured Quan-
Circuit
tity
Voltage
Va a-N
Vb b-N
Vc c-N
Vab a-b
Vbc b-c
Vca c-a
V a+b+c
N
a-N
Vavg b-N
c-N
a-b
Vavg b-c
c-a
a-b
Vunbal b-c
c-a
Current
Ia a
Ib b
Ic c
I a+b+c
N
Iavg a+b+c
Iunbal a+b+c
Fundamental Power Factor
cos φ(a) a
cos φ(b) b
cos φ(c) c
cos φ a+b+c
Power Factor
PFa a
PFb b
PFc c
PF a+b+c
Phase Angle
φa a
φb b
52
Operational Measured Quantities Depending on the Connection Types in Power Systems
(10/12 cycles)
3-Wire
Network
1-Phase
(Delta)
System
Balanced
(1I)
x –
– –
– –
– x
– x
– x
– –
– –
–
– x
x x
– –
– –
– –
– –
– –
x –
– –
– –
– x
x –
– –
– –
– x
x –
– –
3-Wire 3-Wire
Network Network
(Delta) (Delta)
Unbalanced Unbalanced
(3I) (2I)
– –
– –
– –
x x
x x
x x
– –
– –
1/3 Σ V
ph-ph
x x
x x
x x
x x
– –
x x
x x
– –
– –
– –
x x
– –
– –
– –
x x
– –
– –
SICAM, SICAM P850/P855 7KG85X, Manual
E50417-H1040-C482-A9, Edition 03.2022
4-Wire
4-Wire
Network
Network (Star)
(Star)
Unbalanced
Balanced
(3I)
(1I)
x x
– x
– x
– x
– x
– x
– x
1/3 Σ V
–
ph-n
– –
– x
x x
– x
– x
– x
1/3 Σ I
–
ph
– x
– x
– x
– x
1/3 Σ cos φ
x
– x
– x
– x
1/3 Σ PF
x
ph
x x
– x
ph