VAPORIZATION COOLED TRANSFORMER

RD-6290 A hermetically- sealed vaporization chamber contains heat-producing electrical apparatus such as a transformer to be cooled while dielectrically protected, and also contains a two-phase dielectric fluid (a liquid and a vapor). The liquid resides at a bottom portion of the chamber, and is further distributed of vertical cooling ducts which extend through the apparatus. The vapor is produced by vaporization of the liquid by heat from the apparatus, the vapor occupying space in the chamber above the liquid level. A condenser has one end connected in communication with an upper portion of the vaporization chamber occupied by the vapor. A reservoir containing a predetermined mass of non-condensible dielectric gas is above the condenser, and the condenser has another end connected in communication with the reservoir and the gas within it. A liquid dam is positioned on the upper edges of the apparatus adjacent the vertical ducts. A distribution pan in the chamber is located above the liquid dam for receiving liquid condensate from the condenser and distributing the liquid condensate from the condenser and distributing the liquid condensate uniformly to the liquid dam. The liquid dam distributes the liquid condensate uniformly as a film over the wall surfaces of the adjacent vertical ducts. A condensate make-pump is included for pumping liquid from the bottom portion of the chamber to the distribution pan.