Insulating materials for high voltage machines for atomic power plants

Abstract

The paper deals with estimating the effect of radiation oil electrical insulating materials. In atomic power plants such materials are exposed to different intensities of radiation depending upon their use in the type of electrical equipment. In a first approach different types of thermoplastics and thermosetting resin materials were exposed to gamma radiations. The effects observed and probable reasons are discussed. Subsequently full coils were exposed to radiation with a dosage equivalent to the minimum service life required in the electrical machines. Since such machines cannot be assessed while in continuous service, because of radiation conditions (except while the plant is shut down for periodic maintenance), a high level of confidence in materials used is required. Descriptions of studies conducted and conclusions are summarised in the paper.