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Comparative study of HVAC and HVDC transmission systems ...· Beyond break-even-distance HVDC is more economic than HVAC. Break-even distances for the submarine or underground cables and overhead transmission lines are 50 and 600 km. HVAC cables are common, but HVDC cables are rare. New Zealand, Spain, Switzerland and Canada, have laid down 220, 380, 400 and 500 kV, 8–37 km long, DC cables.

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