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Hathaway, G.M.

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High temperature superconducting power cable termination

A high temperature superconducting (HTS) cable transmission system where the losses due to an alternating current are vastly reduced compared to traditional methods appears to be an attractive option for electricity supply companies. An increase in power transfer for the same or lower voltage would result through the use of such a system. However, there remain a number of important technical issues to be addressed before companies are willing to accept this technology. One component of the power system which has a unique role to play in the secure transmission of power from cryogenic to ambient temperatures is the cable termination. Under steady-state conditions, this must be capable of carrying from no load to maximum continuous current from liquid nitrogen to ambient temperatures in the presence of high voltage such that the security of supply is maintained. The work presented in this thesis identified a conceptual design consisting of a horizontal cable-to-termination connection region, and a vertical cryogenic-transition-ambient region. The transition between the two temperature extremes was considered the most critical part of the design owing to the complex interaction of the three principal field quantities, the temperature, potential and mechanical displacement.Thermal modelling was carried out to determine the temperature distribution and the minimum heat flow into the cryogenic region, and the current lead was optimised to provide the minimum heat flow into the low temperature region. Due to the high heat flow into the cryogenic region, and the low temperature of the dielectric in the ambient region, a bushing design of transition region was implemented with a vapour-cooled current lead. Electric stress modelling identified several areas of stress enhancement.</p

High temperature superconducting power cable termination

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