Insulators with semiconducting glaze (SCG) have long been known for their superior contamination performance. The pollution flashover voltage of SCG insulators in two times higher than standard porcelain insulators or even 50% higher than silicon composite insulators. Early glazes for this type, however, were not stable and successful use od semiconductive glazed insulators was delayed many years until tin-antimony oxide glazes were developed. Service experience of twenty-five years is now available for line, station and bushing insulators with this type of glaze. The paper desribes the electrical properties of cap and pin insulators with SCG thermal stability conditions and corrosion phenomenon.
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