PPA5xx/15xx user manual
9-9
From these elementary ‘a’ and ‘b’ values of voltage and
current, the following secondary values can be derived:
fundamental Watts = V
a
x A
a
+ V
b
x A
b
fundamental VA = V
mag
x A
mag
fundamental power factor = W
fund
/ VA
fund
fundamental VAr = V
a
x A
b
- V
b
x A
a
The signs of Watts and VAr are a direct result of the
computation (watts has the sign of cos(phase angle), VAr
has the sign of sin(phase angle)). The sign of fundamental
power factor is determined by convention such that a
lagging current (inductive load) is shown as a positive
power factor and a leading current (capacitive load) is
shown as a negative power factor; this is effectively the
sign of sin(-phase angle). Optionally the signs of
fundamental VAr and power factor can be independently
inverted.
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