Testing and Applications for Hybrid Insulators for Medium Voltage Applications

摘要

Newly developed medium voltage insulator was tested. The insulators are expected to be used on 24 kV distribution network and a modified type of it can be installed on the railway network where the dielectric properties should be much better because of the higher requirements. The most important aspects of the development were to form a new hybrid insulator, that this is more reliable than the porcelain and the resin. The inner core was made by a specially developed technology and from a cycloalific epoxy resin composition, which provides an exceptionally good mechanical strength and rigidity. A perfect contact between the metal and the synthetic resin is a direct way to secure the electric conductors as well as the excellent electric strength. After improving the interface zone a complete design test according to IEC 1109 was successfully performed.