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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

COOLANT DISTRIBUTION IN DISC TYPE TRANSFORMER WINDING HORIZONTAL DUCTS AMD ITS INFLUENCE ON COIL TEMPERATURES

Get access (open in a dialog) DOI: 10.1615/IHTC7.2200
pages 251-256

要約

Power transformer size, rating and insulation life expectancy are all influenced by winding heat transfer. The fluid flow distribution and winding copper "hottest spot" are closely related. In a disc winding, the flow is in horizontal ducts where buoyancy forces have imperceptible equalising effect.
Flow distributions have been measured and predicted by a Navier equation algorithm for a perspex model representing winding sections of five and eight ducts. It was concluded that the hottest spot would be in the coils above and below the centre duct, contrary to the "Norris" thesis which implies that the uppermost coil is the hottest one.
Changes in the geometry of the inlet and outlet manifolds were investigated with the aim of equalising the flow distribution and reducing the hottest spot temperature. Equalisation will greatly simplify thermal calculations and could increase power to weight ratio or lengthen life.