Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 356
Art. 361] ELECTRIC TRACTION 331 … 332 PRINCIPLES OF ELECTRICAL ENGINEERING [Chap, xl the necessary step-down transformers. For the direct-currentsystem, on the other hand, at 600 volts, substations must be closertogether to maintain the trolle}^ voltage and these substationscontain rotary converters as well as step-down…
Electrical engineering
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