| 摘要 |
PROBLEM TO BE SOLVED: To restrain from concentration of an electric field on a prescribed region between windings. SOLUTION: Insulating cylinders 60, 62, 64 are arranged in gas spaces 58 which are arranged between a low-pressure winding 52 and a high-pressure winding 54. When spacing materials 66 are arranged, four spacing materials 66 are arranged in a region A1 and a region A3, where a differential voltage is low which is generated between strands constituting the high-pressure winding 54, and two spacing materials 66 are arranged in a region A2 where a differential voltage is high. As a result, concentration of an electric field in the region A2 is relaxed.
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