DC time constant evaluation
for HVDC GIS cable accessories


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