Omicron CP TD1 - Page 50

CP TD1 Reference Manual V 1.44
50
Figure 5-12 and table 5-1 show a temperature correction factor (according to
ANSI 57.12.90) for insulation based on mineral oil [2.4].
Figure 5-12 Temperature correction factor for mineral oil insulation [2.4]
where
F
p20
is the power factor corrected to 20°C
F
pt
is the power factor measured at T
T is the test temperature (°C)
K is the correction factor
Table 5-1 Temperature correction factor for mineral oil insulation [2.4]
Test temperature T (°C) Correction Factor K
10 0.80
15 0.90
20 1.00
25 1.12
30 1.25
35 1.40
40 1.55
45 1.75
50 1.95
F
p20
F
pt
K
-------=