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Insulation Gas transformer maintenance micro water suppliers

Moisture in insulation - IEEE Web Hostingewh.ieee.org/soc/pes/saintlouis/2010 12 6/Moisture...· PDF file4/2/2008· Example of water distribution in a 25 MVA transformer with 3% moisture in paper 40°C Oil (25 000litre) 10 ppm 0.25 kg Paper (2500 kg) 3 % 75 kg Total 75.25 kg 80°C 80 ppm 2.0kg 2.93% 73.25 kg 75.25 kg •Most of the water is in the solid insulation •Change in water content of oil does not entail a similar change in the water content of paper

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