STRUCTURAL INTEGRITY EVALUATION OF A CORRUGATED TYPE RADIATOR FOR A HERMETICALLY SEALED OIL TRANSFORMER

摘要

An active part of a hermetically sealed oil transformer is a heat source increasing the temperature and the volume of insulation oil. The oil volume increase results in significant pressure variations to a tank of the transformer, and also can cause serious damage of the tank. For this reason, a corrugated type radiator is generally adopted to the transformer since it can provide prevention from the internal pressure rise by expansion of corrugated radiator fins. In this paper, design of a corrugated type radiator for the hermetically sealed oil transformer is suggested, and structural integrity of the radiator is evaluated by both numerical and experimental methods. The design of the corrugated type radiator has been proposed and variation of oil pressure inside the radiator is estimated for operating load case. The structural integrity of the proposed radiator is performed, and measured strain values are compared with the analyses results. In addition, a fatigue analysis of the radiator is conducted. From the results, it is concluded that the design of the radiator meets the requirements for structural integrity in the operating condition.