A new type surge protective grounding device for high voltage power cable lines

A new type surge protective grounding device for high voltage power cable line was design and developed by theory analysis and validating tests in this paper. This device is made up of three main parts including high strength polymeric framework, copper bus-bar and over voltage protector. All parts were sealed in one piece of EPR body which molded by continuously injecting rubber. This device combined cable metallic shield grounding and cable sheath over voltage protecting techniques with waterproof technique to overcome defects of conventional protective grounding device such as protection failure due to water intruding, coagulated dew and incorrect connection etc. This protective grounding device not only protects power cable line from over voltage damaged and/or circulating current affected effectively, but also its weight and volume were decreased much more. Furthermore, type test was used for validating operation reliability and production quality of the protective device in the paper. The results of application research and type test had been proved that this new type surge protective device can satisfy the technical requirements of the standards and meet the practical demands of protective grounding and over voltage protecting of power cable lines in field.