. Electric railway review . Portland Railway—General formers are also bare wire, mounted on line insulators andprotected by concrete barriers. From each phase in the buscompartments connections are made through hand-operateddisconnecting switches with S50-kilowatt single-phase trans-formers, which lower the potential from 33,000 volts to 11,000volts. Transformer Arrangements. By reference to the sectional views of the wire tower thespecial arrangement of the transformers may be noted. Each with disconnecting switches that either half may be deadand the transformers and phase-changing set still
. Electric railway review . Portland Railway—General formers are also bare wire, mounted on line insulators andprotected by concrete barriers. From each phase in the buscompartments connections are made through hand-operateddisconnecting switches with S50-kilowatt single-phase trans-formers, which lower the potential from 33,000 volts to 11,000volts. Transformer Arrangements. By reference to the sectional views of the wire tower thespecial arrangement of the transformers may be noted. Each with disconnecting switches that either half may be deadand the transformers and phase-changing set still have theircurrent supply uninterrupted. As the switchboards stand on. fikjrFloor Rjin Portland Railway—Sections and Plans of High-Tension Tower, Showing Transformer Sections and Connections. transformer unit is housed in a brick and concrete com-partment which can only be entered through steel fire doorsopening on to a concrete platform at the rear of the substa-tion, as shown in the exterior view of the building. The sixstep-down transformers are of the oil-insulated water-cooledtype, mounted on trucks so that they may easily be drawnon to the platform outside the building for repairs. From the secondary side of the step-down transformerscurrent is taken by wires leading through a partition walland connecting through knife switches with an 11,000-volt,3-phase set of buses extending parallel with the row of trans-formers. These buses are provided with knife switches at the machine floor directly above the bus lines the wiringconnections are comparatively simple for such a large sta-tion. Switchboard and Machines. The switch equipment includes seven Fo
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
