47
IM CW500-02EN
Neutral current An [A]
*
Only for 3P4W wiring
Range
Same as rms current
Display digits
Same as rms current
Display range
Same as rms current
Equation
An
=
(
)
{
}
(
)
{
}
2
2
)1
3
sin(
3
1
2
sin
2
)1
3
cos(
3
1
2
cos
2
1
θ
θ
θ
θ
θ
θ
θ
θ
−
+
−
+
−
+
−
+
A
A
A
A
A
*
θ1, 2, and 3
denote the phase difference between
V1
and
A1, 2, 3
, respectively.
Voltage unbalance factor Uunb [%]
Display digits
5 digits
Display range
0.00% to 100.00%
Wiring
3P3W, 3P4W
Measurement
system
Complies with IEC61000-4-30
Accuracy
Measurement waveform ±0.3% for a 50 to 60 Hz sine wave
(0% to 5% for IEC61000-4-30 testing)
Equation
(
)
(
)
100
6
3
1
6
3
1
×
−
+
−
−
=
β
β
Vumb
(
)
2
2
31
2
23
2
12
4
31
4
23
4
12
V
V
V
V
V
V
+
+
+
+
=
β
*
Uses the first harmonic of the harmonic voltage.
*
For 3P4W, phase voltage is converted to line voltage for
calculation.
V
12
= V
1
-
V
2
,
V
23
= V
2
-
V
3
,
V
31
= V
3
-
V
1
Current unbalance factor Aunb [%]
Display digits
5 digits
Display range
0.00% to 100.00%
Wiring
3P3W, 3P4W
Equation
(
)
(
)
100
6
3
1
6
3
1
×
−
+
−
−
=
β
β
Iumb
(
)
2
2
31
2
23
2
12
4
31
4
23
4
12
A
A
A
A
A
A
+
+
+
+
=
β
*
Uses the first harmonic of the harmonic current.
*
For 3P4W, phase current is converted to line current for
calculation.
A
12
= A
1
-
A
2
,
A
23
= A
2
-
A
3
,
A
31
= A
3
-
A
1
Specifications