Cewe Prometer 100 - Page 63

BGX501-943-R01 Prometer 100 User Manual Page 63 of 72
Reactive energy capacitive: quadrant II and IV
Apparent energy
Apparent energy is calculated for import and export. The direction is controlled by the sign for active power;
apparent energy is registered for the direction that the active energy has during the same period.
Apparent energy import: quadrant I and IV
Apparent energy export: quadrant II and III
Power Factor
1/1)1( SPLpf =
SPTotpf /)( =
The power factor is calculated without signs and is thus always positive.
Phase angle
pIpUL 11)1( −= ϕ
Phase angle for an element is calculated from the fundamental phase angles.
)1/
1arctan()(
fundfund
QPTot =
ϕ
Total phase angle is calculated from fundamental power.
Phase angle values specified between –180 ° and 180°.
THD
Total harmonic distortion
%100
...
...
2
1
2
2
2
1
22
3
2
2
⋅
++
++
=
−n
n
eur
III
III
THD
Where
1
I
…
n
I
are the current’s harmonic components. The calculation is made in the same ways for current
and voltage.