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HVDC Light cables
With HVDC Light cables there is no need to get permits for an overhead line!
Land cables
Cable laying for Murraylink, Australia | The new HVDC Light cables have insulation of extruded polymer. The insulation is triple extruded together with the conductor screen and the insulation screen.
In HVAC there has been a change of technology going from paper insulated cables to extruded cables, mostly XLPE. The preference of |
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extruded cables also for applications in HVDC has been obvious for a long time. Several reports have been published in the past, where XLPE has been tested for HVDC applications but without success. One reason has been the existence of space charges in the insulation leading to uncontrolled local high electric fields causing dielectric breakdowns. Another reason has been uneven stress distribution due to temperature dependent resistivity causing overstress in the outer part of the insulation.
The HVDC Light cable development has overcome these problems and has resulted in an extruded cable for HVDC that is an important part of the HVDC Light concept. The cables are operated in bipolar mode, one cable with positive polarity and one cable with negative polarity. The cables are installed close in bipolar pairs with anti-parallel currents and thus eliminating the magnetic fields.
Submarine cables
Cable laying at Cross Sound project, USA | The strength and flexibility of HVDC Light cables make them also suitable for submarine use. They can be laid in deeper waters and on rough bottoms. |