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Literature available on flitch plate loss analysis is quite scarce. Calculation of losses and temperature rises occurring in structural parts of a transfanner is a very complex task due to magnetic and thermal non-linearity. Karsai et. al. have given an approximate but practical method of calculation of losses and temperature rise of critical strwtural parts of a transformer [2]. Eddy-current losses arising in metallic parts of rectangular cross section are calculated by an analytical method which makes certain approximations based on experimental factors [3]. Field strength at the inner edge of the LV winding is assumed to vary periodically with a sinusoidal distribution in the space along the height of the winding, and the non-sinusoidal nature is accounted by multiplying loss by a factor. The approximations made are: eddy current reaction is neglected and only amplitude of harmonic campanents of the field strength in the z direction (perpendicular to plate surface) are subject to change, their wavelengths and phase positions remaining unaltered. For a l l l y slotted flitch plate, the

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