. Electric railway review . modate additionalequipment, the original building was extended to the plant now furnishes current for three classes of ser-vice: 25-cycle. 13,200-volt alternating current; 60-cycle,,000-volt alternating current, and 600-volt direct cur-rent. The generating units consist of vertical cross-com-pound, Corliss-valve engines direct connected to alternatingor direct-current generators, and vertical turbine generatingunits. The auxiliaries for the engines generating currentfor these classes of service are electrically driven by motorssupplied with current
. Electric railway review . modate additionalequipment, the original building was extended to the plant now furnishes current for three classes of ser-vice: 25-cycle. 13,200-volt alternating current; 60-cycle,,000-volt alternating current, and 600-volt direct cur-rent. The generating units consist of vertical cross-com-pound, Corliss-valve engines direct connected to alternatingor direct-current generators, and vertical turbine generatingunits. The auxiliaries for the engines generating currentfor these classes of service are electrically driven by motorssupplied with current from the busbars with which theirgenerating unit is connected. The unit system has beenmaintained throughout the construction of the power plantfrom the stacks to the distribution feeders. There are eight stacks serving eight sets of boilers posi-tively subdivided into two groups and with no cross connec-tions. Each of these eight sets of boilers feeds steam directto an engine driving a generating unit. As the turbines were. 8i eg f ;? fo? ? }^ «ll p S-j::r ■■t:l ■ ■■ Commerce Street Power Plant, Milwaukee—View from River. installed after most of the station had been erected, separateboilers are not provided for their steam supply, but eachturbine is fed by a steam main which has its source ofsupply in the equalizing header connecting the two groups ofboilers. The engines driving the tour direct-current gen-erators are fed by one-half of the 16 boilers and the enginesdriving the alternating-current generators are fed by the other half of the boiler equipment. As there is no crossconnection between the two halves of the station equip-ment, except through the atmospheric exhaust and the boilerfeed line, the probability of a complete shut down of theplant is very remote. While there are but four boiler feedpumps for all the boilers, any two of these pumps have suf-ficient capacity to feed the entire battery of boilers, and as
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
