Excerpt from Transients on Transmission Lines and Modern Protective Devices
In the last three decades a very rapid progress was made in the generation and the distribution of electrical energy. The ever increasing demand for electrical power brought about a phenomenal growth in the size of generating equipment, especially in the centers of industry and of population. At the Columbian exposition was exhibited then the largest alternator in the world. It had a capacity of 750 k. v. a. To-day many single units carry a continuous load of 50,000 k. v. a. For economical transmission high voltage had to be employed. The phenomena occuring in these high voltage, high power circuits, under a steady flow of power, and normal conditions are well understood, and can be predetermined and calculated with little difficulty. The limitations of the apparatus, however, are found in the abnormal conditions which often occur.
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