| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power transformer wherein noise caused in a space configured by a tank bottom side of the power transformer, a base and an installed face can simply be reduced. <P>SOLUTION: The power transformer is installed on the installed face such as a floor face via the base comprising shape steels or the like. A plurality of spaces are formed to the tank bottom plate, the base, and the installed face of the power transformer at a lower part of the power transformer. One end of the spaces is closed by the base, and the other end is opened as a one-end open space in the length direction and/or width direction among the spaces. When the length size of the one-end open space is a length whereby a frequency causing the resonance in the one-end open space, and a frequency of conduction noise of the power transformer are coincident; the base for closing the one end in the one-end open space includes holes with a size not giving an adverse effect on the strength of the base. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
