Varnish and wire enamel compatibility study

The industry trend to make motors and transformers smaller, more efficient and less costly has continued to place an increased load on the function of the insulation system. In order to keep pace with the needs of the ever more demanding electrical industry, the chemical industry has been developing insulating materials based on new complex chemistry that will withsand the higher temperatures and stresses imposed upon them during the manufacture and operation of the smaller electrical equipment. It has become increasingly evident that the interrelationships or compatibilities of the various insulation components play an important role in determining the ultimate temperature capability of the insulation system. As a result, the General Electric Company has had under way a wire enamel/varnish compatibility study with the newer insulated magnet wires since mid-1968.