Testing Extruded Cable Systems Up to 525 kV DC by Heiko Jahn and Uberto Vercellotti

Demand is growing for HVDC cable systems to carry high power over long distance, allow greater grid flexibility and help connect renewable energy sources to urban demand. As a result, test laboratories are receiving many requests to verify performance of such systems. This presentation reviews a feasibility study for setting up test circuits that enable laboratory testing of full-scale HVDC cable systems to verify performance and culminating in the first Transient Over Voltage test on a 525 kV DC cable system loop. Testing started with Type Tests to verify project integrity and continued with Pre-Qualification Tests to evaluate reliability as well as meeting requirements to withstand dynamic voltage stresses of non-standard nature.