Hioki 3390 - Page 176

10.5 Calculation Formula Specifications
168
(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 neg-
ative (-P) for reverse power (regeneration), and indicates net current flow for power.
Apparent
power
• Select U(i) and i(i) from rms/mn.
• For 3P3W3M and 3P4W waveforms, U(i) is phase voltage.
Reactive
power
• The polarity sign (si) for reactive power (Q) is indicated by [none] 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. For 3P3W3M and 3P4W waveforms, U(i)s is phase voltage.
(3P3W3M:U1s=(U1s-U3s)/3, U2s=(U2s-U1s)/3, U3s=(U3s-U2s)/3)
Power
factor
• The polarity (si) for power factor ( λ ) 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. 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.
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
++=
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
++=
λ i() si i()
P i()
S i()
--------
=
λ
12
si
12
P
12
S
12
--------
=
λ
34
si
34
P
34
S34
--------
=
λ 123 si
123
P
123
S
123
----------
=
φ
i()
si
i()
λ
i()
1–
cos=
φ
12
si
12
λ
12
1–
cos=
φ
34
si
34
λ
34
1–
cos=
φ
123
si
123
λ
123
1–
cos=