Waterproof surge protective grounding devices for high voltage power cable lines were design and developed by theory analysis and validating tests in this paper. The devices are made up of three main parts including high strength polymeric framework, copper bus-bars and over voltage protectors. All parts were sealed in one piece of EPR body which molded by continuously injecting rubber. These devices improve disadvantages of conventional protective grounding devices such as protection failure due to water intruded, dew coagulated and bus-bars incorrectly connected on site, etc. 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 waterproof surge protective device can satisfy the technical requirements of the standards and meet the practical demands of protective grounding and over voltage protecting of HV power cable lines in field.
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