Electrex X3M, Руководство пользователя

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8 Parameters and formulas
For each type of connection, the available readings as well as the formulas used for their calculation are
provided.
The redings not available will be displayed as
in place of the value.
8.1 3P 4W Three phase with 4 wire neutral
N
1
3
N
1
2 3
I
1
I
3
I
2
U
1N
U
2N
U
3N
I
1N
I
3N
I
2N
2
Current inputs
Voltage inputs
8.1.1 Available Reading:
1 Frequency:
Voltage frequency
N
V
1
:
f
2 RMS amplitude:
Phase Voltages:
N
U
1
,
N
U
2
,
N
U
3
Average Phase Voltages:
λ
U
Phase-phase Voltages:
12
U
,
23
U
,
31
U
Mean Phase-phase Voltage:
∆
U
Phase Current:
1
I
,
2
I
,
3
I
Neutral Current:
N
I
Mean three phase Current:
Σ
I
3 Total harmonic Distortion (in percentage):
Phase Voltages THD:
N
U
THD
1
,
N
U
THD
2
,
N
U
THD
3
Mean 3 phase voltage THD:
λ
U
THD
Phase Current THD:
1
I
THD
,
2
I
THD
,
3
I
THD
Mean 3 phase current THD:
Σ
I
THD
4 Power (on the short period):
Phase Active Powers:
1
P
,
2
P
,
3
P
3 Phase Active Power:
Σ
P
Phase reactive Powers:
1
Q
,
2
Q
,
3
Q
3 Phase Reactive Power:
Σ
Q
Phase apparent Powers:
1
S
,
2
S
,
3
S