Omicron CP TD1 Reference Manual

173
Appendix
for them electronically, so it is now for the first time possible to measure in the
field down to DF = 5 x 10 E-5. The correlation between DF and power
factor = cos ϕ and the vector diagram are shown in Figure 12-30.
Figure 12-30 Correlation between DF and PF
To the present day, the dissipation or power factor was measured only at line
frequency. With the power source described in [8], it is now possible to make
these insulation measurements in a wide frequency range. Beside the possibility
to apply frequency scans, measurements can be made at frequencies different
from the line frequency and their harmonics. With this principle, measurements
are possible also in the presence of high electromagnetic interference in high-
voltage substations.
I
m
I
CN
I
CX
δ
U
O
R
e
Withδ 1
δδϕ
δ
sin≅tan≅
«
π
2
--- ϕ–=
PF
DF
1 DF
2
+
------------------------=
DF
PF
1 PF
2
–
-----------------------=

Omicron CP TD1 Specifications

General

Brand	Omicron
Model	CP TD1
Category	Measuring Instruments
Language	English