Fluke 1744 - Manual (Page 53)

1744/1743
Users Manual
44
Total active power of the
fundamental for three
phases
∑
=
⋅ =
3
1
1 1
k
k total
Ph Ph
Apparent power of the
fundamental per phase.
Basic value for 200 ms.
1 1
. 1 I V Sh
bas
=
Apparent power of the
fundamental per phase per
interval
∑
=
⋅ =
M
j
j bas
Sh
M
Sh
1
1
1
1
Power factor of the
fundamental per phase
1
1
1
1
cos
1 Qh
Qh
Sh
Ph
total ⋅ = ϕ
Total power factor on all
three phases
total
total total
total Qh
Qh
Sh Sh Sh
Ph
1
1
1 1 1
1
cos
3 2 1
1
⋅
+ +
= ϕ
Active energy per phase
and total Active power accumulated on each logging interval
Sign of PF, tan φ, cos φ:
• Sign “+” : Q positive (“inductive”)
• Sign “–” : Q negative (“capacitive”) independent of the sign of active
power P
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