180
Calculation Formula
8. Power factor (PF), Displacement power factor (DPF)
Wiring
Item
Single phase
2-wire
1P2W
Single phase
3-wire
1P3W
3-phase 3-wire
3P3W2M
3-phase 3-wire
3P3W3M
3-phase 4-wire
3P4W
PF [ ]
PF/Q/S
Calculation
Selection:
RMS value
calculation
PF
1
PF
c
=
c
c
S
P
si
PF
1
PF
2
PF
1
PF
2
PF
3
PF
sum
=
sum
sum
S
P
si
•
Si
: indicates lag and lead. The sign of reactive power Q (fundamental wave reactive power) is used.
Sign +: lag
Sign −: lead
• When
S < |P|
due to the effects of measurement errors or unbalance,
S = |P|
and
PF = 1
.
• When
S = 0
, PF is taken as invalid data.
DPF [ ]
PF/Q/S
Calculation
Selection:
Fundamen-
tal wave
calculation
DPF
1
DPF
c
=
)1(
)1(
c
c
S
P
si
DPF
1
DPF
2
DPF
1
DPF
2
DPF
3
DPF
sum
=
)1(
)1(
sum
sum
S
P
si
•
Si
: indicates lag and lead. The sign of reactive power Q (fundamental wave reactive power) is used.
Sign +: lag
Sign −: lead
• (1): indicates the harmonic calculation fundamental wave (1st order)
• When
S
c(1)
= 0
,
DPF
is taken as invalid data.
c
: Measurement channel
9. Active energy (WP+/WP−), Reactive energy (WQ_LAG/WQ_LEAD), Apparent energy (WS),
Energy cost (Ecost)
Wiring
Item
Single phase
2-wire
1P2W
Single phase
3-wire
1P3W
3-phase 3-wire
3P3W2M
3-phase 3-wire
3P3W3M
3-phase 4-wire
3P4W
WP+ [Wh]
(consumption)
WP+=
∑
+
h
sum
Pk
1
)(
•
P(+)
: Only the consumption component of active power (positive component) is used.
WP− [Wh]
(Regeneration)
WP−=
∑
−
h
sum
Pk
1
)(
•
P(−)
: Only the regeneration component of active power (negative component) is used.
WQ_LAG
[varh]
(Lag)
WQ_LAG=
∑
h
sum
LAGQk
)(
•
Q(LAG)
: Only the lag component of reactive power is used.
WQ_LEAD
[varh]
(Lead)
WQ_LEAD=
∑
h
sum
LEADQk
1
)(
•
Q(LEAD)
: Only the lead component of reactive power is used.
WS [VAh]
WS=
∑
h
sum
Sk
1
Ecost
[Variable]
Ecost=
rateWP ×+
•
rate
: Electrical unit cost (variable setting from 0.00000 to 99999.9/kWh)
k
: Calculation unit time [h],
h
: Measurement duration
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