Omicron CP CR500 - Page 23

23
Diagnostic of Rotating Machines Insulation
The correlation between the Dissipation Factor and Power Factor (PF = cos
ϕ)
and the vector diagram are shown in figure 6-3.
Figure 6-3:
Correlation between
DF and PF
I
m
I
CN
I
CX
δ
ϕ
U
O
R
e
Withδ 1
δδϕ
δ
sin≅tan≅
«
π
2
-- - ϕ–=
PF
DF
1 DF
2
+
------------------------=
DF
PF
1 PF
2
–
-----------------------=