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The device is connected to line-to-neutral voltages
When the device is connected to line-to-neutral voltages, the voltage
measurement mode is set to equal to "3LN". The following equation
is used for power calculation.
=
⋅
+
*
S
U
I
U
L
1
L
1
L
2
=
Three phase power phasor
S
=
Measured voltage phasor corresponding the
U
1 L
fundamental frequency voltage of phase L1.
=
Complex conjugate of the measured phase L1
*
I
1 L
fundamental frequency current phasor.
=
Measured voltage phasor corresponding the
U
L
2
fundamental frequency voltage of phase L2.
*
=
Complex conjugate of the measured phase L2
I
L
2
fundamental frequency current phasor.
=
Measured voltage phasor corresponding the
U
L
3
fundamental frequency voltage of phase L3.
*
=
Complex conjugate of the measured phase L3
I
L
3
fundamental frequency current phasor.
Apparent power, active power and reactive power are calculated
similarly as with line-to-line voltages
=
S
S
=
P
real
(
S
)
=
Q
imag
(
S
)
P
ϕ
=
cos
S
Measurement Functions
⋅
+
⋅
*
*
I
U
I
, where
L
2
L
3
L
3
5-7
857-UM001A-EN-P – July 2009
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