Some Remarks on Cryogenic Cables
The design of electrical apparatus is primarily based on the fact that we have at our disposal conductors such as copper and aluminum, which have resistances of 1/60 and 1/40 Ω, respectively for each meter in length and square millimeter in cross section. Design is further based on the use of insulators like oil, paper, mica, or plastic and other materials having a dielectric strength of about 100,000 V/cm. If these materials are used with natural cooling conditions, current densities between 3 to 10 A/mm2 and voltages from 220 to 380 V (light, power) to 700 kV (transmission lines) have been found to be economical. Progress in cryogenic technology in recent years now warrants examination of electrical machinery and transmission lines in terms of the properties of materials at low temperatures.
KeywordsMagnetic Field Strength Copper Wire Cable Length Line Voltage Maximum Transmission Power
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