To connect HVDC cables with each other and to substations like gas insulated metal enclosed switchgear (GIS), cable joints and cable connection assemblies need to be used. These components present a higher complexity than cables and GIS alone. Under DC voltage the electric field is changing over time, from a capacitive distribution to a resistive one. The time necessary for this transition is called DC time constant. This paper presents its evaluation through simulations in a cable GIS termination under different conditions, showing the importance of the AC-DC time constant knowledge for the determination of pertinent test program for these types of accessories.
Caterina TOIGO, Thanh Vu Cong, Frank Jacquier, Alain Girodet
Presented at Jicable’23 – Young Research Award #2