Trends in EHV transmission equipment

The winds of change accelerating the growth of electric power in the United States are no longer blowing gently. Basic factors affecting the loading capacity of overhead lines (a common index of electrical capability) are herein examined Before the turn of the century, ac polyphase transmission had been firmly established in the transportation of electric energy. Doubling approximately every ten years, the growth rate in the production and consumption of electric power has been more than twice that for the Gross National Product, and much faster than the rate of increase in the population.