抄録
Recently SF6 gas insulated equipments are equiped more and more in cities in the view point of disaster prevention. These equipments must be expected to work safely and reliably for several ten years. The SF6 gas insulated transformer is one of these equipments.
In SF6 gas insulated transformers polyethylene terephthalate(PET) film and transformer boards are used as main insulating materials.
Because the transformer is filled with SF6 gas that is chemically and physically stable, the life of the transformer depends on the thermal stability of insulating materials.
Therefore, it is important to clarify thermal degradation properties. of insulating materials in gas insulated transformers. This paper deals with the thermal degradation of insulating materials of SF6 gas insulated transformers, and relations between changes in characteristics and the amount of evolved gas from insulating materials due to thermal degradation in SF6 gas are described.
