The interconnection between HVDC cables and Gas Insulated Substations (GIS) technology is becoming an essential part to complete the HVDC transmission systems. Under DC voltage the electric field is complex to simulate as it is influenced by charge accumulation phenomena and by materials conductivities, which again depend on electric field and temperature. The coexistence of different insulating materials coupled with the thermal gradient, makes harder the prediction of the electric field distribution. This paper presents a simulation methodology that can be used to evaluate the electric stresses in GIS/cable termination under different operating conditions including polarity reversal and superimposed impulses.

Caterina TOIGO, Aymeric ANDRE, Thanh VU-CONG, Alain GIRODET, Martin HENRIKSEN