Low Temperatures and Electric Power. Transmission Motors, by Unknown Author Unknown Author

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Cryogenic cable concepts are quite easily put on paper, but those which are electrically practical and easy to install and have low loss are fewer in number. Auto­ matic welding techniques are available for operations such as joining pipes and tubes, Significant effort must be devoted, however, to accommodating the use of such equipment. For instance, in a tubular conductor design employing bellows for thermal contraction, the physical arrangement of the components and the available space between the parts is a crucial factor in allowing the employment of these techniques.

For such an installation, annual operating costs work out at about £ 60, 000, including capital charges. The plant efficiency can now be varied in order to find out how far the plant price may be raised together with the efficiency without putting up the annual costs. This can be read from figure 5, in which the plant price assumed previously is taken as 100%. It is quite evident that with the low efficiency assumed, only a slight increase will justify a massive rise in the plant costs. This is still clearer in figure 6, in which the first derivative from the curve in figure 5, is plotted against the efficiency.

This means that, if a cylindrical conductor is used, it may as well be in the form of a hollow tube—roughly two to three skin depths thick. The resistance of such a tube can be calculated by assuming that the current is uniformly distributed in a layer one skin depth thick. More effective conductor utilization may be obtained by stranding, provided the strands are properly transposed. Transposition means the geometrical arrangement 48 of the strands so that the inductance of the strands will be equal, thus they carry equal currents.

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