Epoxy Resin Casting of Dry-Type Current Transformers [includes discussion]

The use of synthetic resins and casting techniques for the embedment of electrical components is continually increasing in the United States and in Europe. This paper presents to the industry some results of approximately 3 years of work with epoxy resins and casting techniques at Allis-Chalmers Manufacturing Company. Although the work to date has been confined primarily to a 600-volt insulation-class indoor-outdoor, dry, window type of current transformer, experience clearly indicates that the extension of the use of these techniques and materials to a higher voltage class and larger dry-type current transformer applications is not only desirable but feasible.