Omicron CP TD12 - Page 31

OMICRON 31
Introduction to capacitance and dissipation factor measurement
Figure 4-2: Definition of dissipation factor (tan
δ) and the vector diagram
The correlation between the Dissipation Factor and Power Factor (PF = cos
ϕ) and the vector diagram
are shown in Figure 4-3.
Figure 4-3: Correlation between DF and PF
j
Im
I
Cp
I
I
Rp
δ
U
R
e
δtan
1
R
P
ω C
P
------------------
=
I
m
I
CN
I
CX
δ
ϕ
U
O
R
e
Withδ 1
δδϕcos
δ
≅tan≅
«
π
2
---
ϕ–=
PF
DF
1DF
2
+
------------------------
=
DF
PF
1PF
2
–
----------------------
=