Electrical news and engineering . built in the companys shops onSeigneurs street, where they have just completed elevenpassenger and freight elevators of the plunger type, withlifts varying from 40 ft. to 176 ft. for the C. P. R. WindsorStation extension. Recent Improvements in Distributing TransformersAbout three years ago marked improvements weremade in the design of single-phase distriljuting transform-ers and it was thought for a time that further improve-ments were practically impossible. These improvementswere first embodied in the type S transformer developedby the Westinghouse Electric
Electrical news and engineering . built in the companys shops onSeigneurs street, where they have just completed elevenpassenger and freight elevators of the plunger type, withlifts varying from 40 ft. to 176 ft. for the C. P. R. WindsorStation extension. Recent Improvements in Distributing TransformersAbout three years ago marked improvements weremade in the design of single-phase distriljuting transform-ers and it was thought for a time that further improve-ments were practically impossible. These improvementswere first embodied in the type S transformer developedby the Westinghouse Electric & Manufacturing Company,and consisted principally in a radically new shell designof magnetic circuit whereby low magnetic reluctance isobtained without increasing the mean length of turn of thewinding, and which was especially adapted for the use ofthe new silicon steel for the magnetic circuit. These im-provements resulted in a marked increase in efficiency, bet-ter regulation, and a reduction in current, all im-. l)orlant characteristics. It is the belief of the ilesignersof this line of transformers that this improved shell typeof construction cannot be materially improved upon fordistributing transformers of the 2200 volt class. The suc-cess of the large number of transformers of this type nowin service supports this view. More recent improvementshave, however, resulted from improved materials and bet-ter mechanical design. The subject of insulation has beengiven special attentimi, and the insulating materials now used are of better quality both mechanically and elec-trically. As a result, further increase in efticiency and re-duction of exciting current has been obtained. Ior ex-ample, the T/i type S transformer which formerlyhad an iron loss of 62 watts and copper loss of 125 watts,now has only 57 watts iron loss and 110 watts copper exciting current has been reduced from per per cent., and the regulation at 100 per cent, powerfac
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