Newtons4th PPA45 Series, Руководство для стартапов, Страница: 67 / 127

PPA45xx Quick User Guide
Page 66
Viewing the data (Green Box) the phase angle of the fundamental is shown as
78.90⁰. A perfect transformer would display a phase angle of 90⁰. From this data
we can confirm that there must be parasitic elements within the makeup of the
transformer causing these results, such as a series resistance.
The Pcorr (Corrected Power) and K factor values displayed within the
Orange Box (see previous page) are computed in transformer mode. In
transformer mode there is usually very little distortion. The equations used to
calculate these values are:
The K factor equation is the lower one in the left hand column.
The Corrected power (P
0
) equation is the top one in the right hand column.
IEC 6007 6-1 :2011
Where
P or P
0 =
corrected power
P
m
= measured power
P
1
= ratio of hysteresis loss to total iron losses
P
2
= ratio of eddy current losses to total iron losses.
U’ = Normalised mean value of voltage
U = rms value of voltage