. Electric railway journal . ld reduce the feeder losses and, thereby, thepeak demand by approximately 1,200 kw., besidesreleasing a large amount of copper. Such a substationhas been built and, at this writing, has been in fulloperation less than one month, which is not a sufficientperiod to give an accurate comparison of new with oldsystem peak demands, but there is every indication thatthe estimated saving will be exceeded. Converters Preferred to Motor-Generators On account of lower first cost and higher efficiency,converters were chosen for this service instead ofmotor-generator sets as us
. Electric railway journal . ld reduce the feeder losses and, thereby, thepeak demand by approximately 1,200 kw., besidesreleasing a large amount of copper. Such a substationhas been built and, at this writing, has been in fulloperation less than one month, which is not a sufficientperiod to give an accurate comparison of new with oldsystem peak demands, but there is every indication thatthe estimated saving will be exceeded. Converters Preferred to Motor-Generators On account of lower first cost and higher efficiency,converters were chosen for this service instead ofmotor-generator sets as used in the older stations. Theuse of converters so close to heavy traction loadsinvolves several serious difficulties, all due to theabsence of direct-current feeder resistance to reduce therush of short-circuit current in case of a broken trolley, 270 Electric Railway Journal Vol. 58, No. 8 Construction Details and Equipment Arrangement for New Substation of the Market Street Railway in the Downtown District of San Francisco. ■ssnm
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