Determining magnetic wire insulation stability

Many high-temperature magnet-wire insulations are available which will meet initial design requirements and their suitability in this regard can be determined by comparatively simple and routine tests. Assessing the ability of such materials to maintain adequate properties throughout desired equipment life is somewhat more complicated. Consideration must be given to factors influencing deterioration and a criterion selected for the determination of insulation life. The most realistic results will be obtained when the material is tested in a configuration where the physical and electrical stresses are representative of those found in actual apparatus.