GAS INSULATED STATIONARY INDUCTION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a large-capacitance gas insulated stationary induction apparatus which is inexpensive and excellent in long-term reliability of mechanical and electrical strength of an insulating cover layer of a winding. SOLUTION: An insulating cover layer of a winding 3 having its upper and lower parts connected to a neutral point with a high-voltage line led out from the center thereof is divided into three parts, which are covered with three types of plastic films having different characteristics. An upper part 3a is covered with a film having heat resistance property of insulation type not lower than type F and higher than heat resistance properties of the other films. A center part 3b is covered with a film having a dielectric breakdown field higher than those of the other films and heat resistance property higher than that of the film covering a lower part 3c.