Hioki PW3390 - 11.2 Trouble Shooting

10.6 Calculation Formula Specifications
212
(i) : Measurement channel
M : Number of synchronous samples
s : Sample (data point) number
1P2W 1P3W 3P3W2M 3P3W3M 3P4W
Active
power
• For 3P3W3M and 3P4W systems, phase voltage is used for waveform voltage U(i)s.
(3P3W3M:U1s=(U1s-U3s)/3, U2s=(U2s-U1s)/3, U3s=(U3s-U2s)/3)
• The polarity sign for active power indicates power flow direction: positive (+P) for forward power (consumption), and nega-
tive (-P) for reverse power (regeneration), and indicates net current flow for power.
Apparent
power
When calculation method TYPE1
is selected
When calculation method TYPE2
is selected
• Select U(i) and i(i) from rms/mn.
• Use phase voltage for voltage U(i) during 3P3W3M and 3P4W wirings for calculation method TYPE1.
Reactive
power
When calculation method TYPE1
is selected
When calculation method TYPE2
is selected
• The polarity sign (si) for reactive power (Q) is indicated by [no sign] for lag or [–] for lead.
• The polarity sign (si(i)) for each channel (i) is acquired from lag or lead of the voltage waveform U(i)s and current wave-
form I(i)s.
Use phase voltage for voltage waveform U(i)s during 3P3W3M and 3P4W wirings for calculation method TYPE1.
(3P3W3M:U1s=(U1s-U3s)/3, U2s=(U2s-U1s)/3, U3s=(U3s-U2s)/3)
• Use calculation method TYPE2's S123 for S123 under 3P3W3M wiring for calculation method TYPE2, and obtain the
polarity sign si123 from the sign for Q123 of calculation method TYPE1.
Power
factor
• The polarity (si) for power factor (  ) is indicated by [no sign] for lag or [–] for lead.
• The polarity sign (si(i)) for each channel (i) is acquired from lag or lead of the voltage waveform U(i)s and current waveform
I(i)s. Polarities si12, si34, and si123 are acquired from reactive power values Q12, Q34, and Q123, respectively.
Power
phase
angle
• The polarity sign (si(i)) for each channel (i) is acquired from lag or lead of the voltage waveform U(i)s and current wave-
form I(i)s. Polarities si12, si34, and si123 are acquired from reactive power values
Q12, Q34, and Q123, respectively.
• In the formula, cos
-1
|  | is used when P 0. When P <0, |180 - cos
-1
|  || is used.
Items
Phase
System
P
i
1
M
-----
U
i
sI
i
s
s0=
M1–

=
P
12
P
1
P
2
+=
P
34
P
3
P
4
+=
P
123
P
1
P
2
P
3
++=
S
i
U
i
I
i
=
S
12
S1 S2+=
S
34
S3 S4+=
S
12
3
2
-------S
1
S
2
+=
S
34
3
2
-------S
3
S
4
+=
S
123
S
1
S
2
S
3
++=
S
123
3
3
-------U
1
I
1
U
2
I
3
U
3
I
2
++=
S
123
S
1
S
2
S
3
++=
Q
i
si
i
S
i
2
P
i
2
–=
Q
12
Q
1
Q
2
+=
Q
34
Q
3
Q
4
+=
Q
123
Q
1
Q
2
Q
3
++=
Q
123
Si
123
S
123
2
P
123
2
–
=
Q
123
Q
1
Q
2
Q
3
++=

i
si
i
P
i
S
i
--------
=

12
si
12
P
12
S
12
--------
=

34
si
34
P
34
S
34
--------
=

123
si
123
P
123
S
123
----------
=

i
si
i

i
1–
cos=

12
si
12

12
1–
cos=

34
si
34

34
1–
cos=

123
si
123

123
1–
cos=