Dielectric Testing of Cable Connection Assembly for Gas-insulated HVDC Systems

The integration of HVDC GIS equipment into offshore wind converter station may also comprise a HVDC GIS cable connection assembly. For HVDC cable systems test requirements are already existing and are successfully applied in the industry. When suggesting testing methods for an interface device, such as the DC cable connection assembly, the differences need to be considered. This paper describes the different test philosophies in the suggested HVDC GIS dielectric testing and existing HVDC cable system testing. The electric field profiles are compared in an exemplified HVDC cable termination under different load conditions and are related to executed qualification tests according to the testing philosophy of HVDC cable systems. The resulting differences due to the different testing philosophies are discussed. This work may serve as input to the discussion of testing approaches for equipment at the interface between DC gas-insulated equipment and HVDC cables.