System for transmission of electric power
First Claim
1. 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.
1 Assignment
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Accused Products
Abstract
A high voltage AC transmission cable system for transmitting power between two points, each connected to one or more power networks, and a method to operate the system. At least one transformer is arranged at each end of the AC transmission cable, wherein at least one of the transformers is arranged to operate the transformer at a voltage whereby losses due to reactive power transport and dielectric losses are minimized. The AC cable is run at a variable voltage regulated such that the voltage is a function of the load for the transmission cable. This operating voltage is not necessarily the same as the nominal voltages in the connection points. A control and communication system and a graphical user interface for carrying out the method are also provided.
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Citations
51 Claims
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1. A high voltage insulated AC transmission cable system for transmitting power between two points each connected to one or more power networks, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method to control a high voltage insulated AC transmission cable system for transmitting power between two points connected to one or more power networks, the method comprising:
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arranging two transformers with variable voltage transformation with one at each of the two points, such that each transformer is in shunt-connection at one of two ends of an insulated AC transmission cable extending between the two points; controlling said 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, wherein said operating voltage may differ from a voltage of said one or more power networks; and arranging two tap-changers with one at each of the two points, each of which is to vary the voltage transformation of one of said transformers according to said operating voltage. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A high voltage insulated AC transmission cable system for transmitting power between two points each connected to one or more power networks, the system comprising:
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two transformers with variable voltage transformation, each of which is arranged at one of the two points in shunt connection at one of 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 dependent on the surge impedance of the 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 two transformers to vary a voltage transformation of the voltage transformers according to said operating voltage. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49)
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50. A method to control a high voltage insulated AC transmission cable system for transmitting power between two points connected to one or more power networks, the method comprising:
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arranging two transformers with variable voltage transformation with one at each of the two points, such that each of the transformers is in shunt-connection at one of the two points at two ends of an insulated AC transmission cable extending between the two points; controlling said transformers in a coordinated manner to regulate an operating voltage level of said insulated AC transmission cable dependent on a surge of impedance of the insulated AC transmission cable, whereby losses due to reactive power transport are minimized, where said operating voltage may differ from a voltage of said one or more power networks; and arranging two tap-changers with one at each of the two points, each of which is to vary the voltage transformation of one of said transformers according to said operating voltage. - View Dependent Claims (51)
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Specification