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In main frequency capacitors the inherent losses are such that the internal heat which is generated can readily be dissipated by the surface area of the container. With higher frequencies, the KVAr output of the capacitor proportionately increases. This make it possible to obtain about 600 KVAr from a capacitor of dimensions which at 50 cycles would be more than what could be dissipated from the surface of the container without giving rise to harmful internal temperature. To prevent this overheating the water-cooling method is adopted. The calculations of KVAr from MFD rating of the Capacitor or vice versa can be done by a direct formula KVAr = 2PIFCV2 x 1 0'
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After winding the extended foil capacitor elements, one edge is soldered to a tinned copper tube, through which water is passed to dissipate the heat generated in the capacitor. For a successful joint between the foils and the tube, it is essential to have: