| 摘要 |
PURPOSE:To obtain the transformer of a high economical efficiency and a high reliability by employing a nonlinear resistance element as a lightning arrester which is connected between the high-voltage part of a winding and a tank thereby achieving the protection of the winding from the invasion of a transient overvoltage such as surge voltage and the miniaturization of equipments. CONSTITUTION:A nonlinear resistance element 9 is attached between a tank 4 and a hook part 5 of a lower part of a high-voltage shiled 5 arranged on the outermost side of a high-voltage winding 3 and the element 9 supports the winding 3 through the high-voltage shiled 5. A columnar spacers 8 and the nonlinear resistance elements 9 are arranged in uniform intervals in a circumferential direction of the winding respectively. As the nonlinear resistance elements 9 are thus arranged in the position nearest the winding, the elements function effectively and restrain the enchroaching transient overvoltage such as surge voltage. Accordingly, the generation of overvoltage in the winding is minimized to protect the winding and the value of the overvoltage to be generated can be foreseen accurately so that the reliability of insulation becomes high, the reduction of winding insulation structure becomes possible and the economical efficiency is improved. |
