Problems of 220-kv. power transmission

The dependence of industrial progress upon an adequate supply of electrical power, together with the vital need for a rational policy of conservation of the country´s fuel resources, points to a probable early demand for transmission of large blocks of power from distant energy sources — coal fields and water powers. Two hundred and twenty kv. is suggested as a logical voltage for such high-capacity, long-distance transmission, and the important problems introduced by large concentrations of power, high voltage and high service standards are discussed. The economic and technical considerations underlying design of a 220-kv. system are outlined, and general designs are developed for a typical 220-kv. transmission line. The studies made establish confidence in the conclusion that 220-kv. transmission is feasible as an immediate commercial proposition. Established principles of design and present types of equipment, with proper adaptation to the new conditions, are applicable to 220-kv. service. While all essential problems seem assured of acceptable solution, attention is directed to certain points as to which further investigation and experimental research are needed to determine most effective designs. It is hoped that the paper may in some measure aid in the working out of this advance in the art by promoting constructive discussion and stimulating the needed investigations.