Hioki CM3286-50, Инструкция по эксплуатации

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94
Equations
Equations
(1) Single‑phase power measurement
Apparent power
S U
RMS
∙
I
RMS
• The active power
P
has no sign
during consumption and a negative
sign during generation.
• Due to the effects of measurement
error ,
S
=|
P
| and
Q
=0 are used when
S
<|
P
|.
Reactive power Q
2 2
P S −
Power factor PF
S
P
(2) Balanced 3‑phase/3‑wire power measurement
Balanced 3‑phase/3‑wire
zero‑cross phase angle
φ
(3P3W)
φ −30°
• The symbol φ represents the
zero-cross phase angle of the
voltage U
12
and the current I
1
.
• The symbol
S
represents
the apparent power of the
line voltage
U
12
and the wire
current I
1
.
Balanced 3‑phase/3‑wire
power factor
PF
(3P3W)
{ }
) 3 3 (
cos
W P
φ
Balanced 3‑phase/3‑wire
active power
P
(3P3W)
[W]
S
W P
⋅ ⋅
) 3 3 (
3 PF
Balanced 3‑phase/3‑wire
apparent power
S
(3P3W)
[VA]
S ⋅ 3
Balanced 3‑phase/3‑wire
reactive power
Q
(3P3W)
[var]
2
) 3 3 (
2
) 3 3 ( W P W P
P S −
HIOKI CM3286C961-00