The mho-carrier relaying scheme

W. R. Brownlee (Commonwealth and Southern Corporation, Jackson, Mich.): Wartime conditions have accelerated studies of methods of securing maximum emergency capability from transmission lines. It has been practicable to build very few new lines to accompany increased loads and additional generating equipment, and the necessary pooling of power resources, including co-ordination of generating-plant maintenance schedules over wide areas, has greatly increased the duties on these lines and interconnections. It is hoped that the economy benefits of peacetime will be attractive enough to maintain an urgent desire for improved reliability of transmission connections. The emergency reliability of lines is especially important, since the avoidable opening of one or more unfaulted transmission lines along with the faulted line may result in complete separation at all other points (through instability) of entire generating plants from loads, overspeed tripping of turbine throttles, loss of station service power, and prolonged service interruptions to widespread areas.