JPS5764912A - Self-cooling transformer winding - Google Patents

Abstract

PURPOSE:To obtain a self-cooling transformer winding of uniform temperature-rise type, by increasing the number of coils of disc winding housed from the bottom section up to the upper ones, when winding sections are provided by separating them by oil flow guide plates outside the inner insulation tube. CONSTITUTION:Coils 2 wound around iron cores in plate form are piled up through horizontal spacers 8 placed at prescribed heights respectively so that horizontal oil passages are formed. Then, the obtained disc windings 1 are arranged through a vertical spacer 9 outside an inner insulation tube 4 so that an inner vertical oil passage 5 is formed. For each coil 2, an oil passage guide plate 7 to close the inner vertical oil passage is set, and the outer peripheral surface of the winding is exposed to the oil. The in-flow oil from under the horizontal oil passage 3 is made to once flow out into a free oil space 6 through owing to the vertical oil passage 5 the presence of the guide plates 7. The oil is led again to the oil passage 3 above the lower section. In this case, the guide plates 7 are not set at equal height but the spacings of the upper ones should be greater than the lower ones so that the number of coils 2 separated by these guide plates 7 are also increased gradually according to their heights.