. Development and electrical distribution of water power . ase system now being standardfor this work, as the costs of thegenerators and of the line copperare less than for any other sys-tem. There are two frequencieswhich also have become standard,viz., 60 cycles and 25 cycles persecond. The higher frequency issuitable for supplying current tomotors and to lamps, either incandescent or arc. It, however,has the disadvantage of giving a higher line drop and poorer regu-lation on long transmission lines than does the lower frequency,and, furthermore, it is difficult to operate rotary converters
. Development and electrical distribution of water power . ase system now being standardfor this work, as the costs of thegenerators and of the line copperare less than for any other sys-tem. There are two frequencieswhich also have become standard,viz., 60 cycles and 25 cycles persecond. The higher frequency issuitable for supplying current tomotors and to lamps, either incandescent or arc. It, however,has the disadvantage of giving a higher line drop and poorer regu-lation on long transmission lines than does the lower frequency,and, furthermore, it is difficult to operate rotary converters at 60cycles. Generally, the costs of transformers, dynamos, and mo-tors are somewhat less for the frequency of 60 cycles than for frequency of any dynamo is equal to the number of poles Xrevolutions per minute -r- 120, and conversely the number of polesin a machine are equal to alternations per minute -J- revolutionsper minute or equal to cycles per second X 120 -r revolutions perminute. The lower frequency has the disadvantage of being unsuitable. Fig. 43. ALTERNATING-CURRENT DYNAMOS 8l for lighting, and dynamos, motors and transformers cost slightlymore than those for 60 cycles. The inductive drop on a longtransmission line, however, is less and rotary converters operatewith ease at this frequency. Therefore, in choosing the frequency,
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