Patent ID: 7759910

Claim:
A high voltage insulated AC transmission cable system for transmitting power between two points each connected to one or more power networks, comprising: an insulated AC transmission cable having two ends and extending between the two points; two transformers with variable voltage transformation, wherein each of the two transformers is arranged in shunt connection at one of the two points at one of the two ends of the insulated AC transmission cable; two voltage control members, each of which is arranged at one of the two points and is connected to one of said two transformers and which are operative to control said two transformers in a coordinated manner to regulate an operating voltage level of said insulated AC transmission cable whereby losses due to reactive power transport are minimized; and two tap-changers, each of which is arranged at one of the two points and is connected to one of the two voltage control members and to a corresponding one of said transformers to vary the voltage transformation of the transformer according to said operating voltage.