USER'S GUIDE____________________________________________________________________
56 __________________________________________________________________ M210474EN-B
Water solubility of mineral transformer oil as a
function of temperature
Figure 1. The water solubility of transformer oils versus
temperature. The margins show the range of variation of water
solubility found in mineral oils.
Ppm-calculation for transformer
oils
Traditionally, moisture in transformer oil is measured by using
ppm-units. The ppm-output shows the average
mass concentration
of water
in oil.
The moisture and temperature transmitter MMT318 and MMT317
have an option for ppm-output provided that this has been notified as
placing the order of the transmitter.
NOTE
Silicone based oils
must have the MMT318 and MMT317 with the
Calculation Model With Oil Specific Coefficients.
WATER SOLUBILITY IN MINERAL TRANSFORMER OIL
10
100
1000
10000
0
10
20
30
40
50
60
70
80
90
100
Temperature (°C)
average water
solubility
range of
variation due to
oil type
range of
variation due to
oil type
