. Electric railway journal . e fact that the protectingground wire is grounded at every pole may be credited the free-dom from lightning troubles enjoyed by this transmission line. SUB STATION S The trolley wire and feeders are supplied with 700-volt direct-current from four motor-generator substations located about10 miles apart. One substation is installed within the powerhouse at Lagoon. The substation installations are similar andeach includes one 400-kw motor-generator set receiving 2300-volta. c. and delivering 700-volt d. c. Banks of three 150-kw water-cooled oil-insulated transformers
. Electric railway journal . e fact that the protectingground wire is grounded at every pole may be credited the free-dom from lightning troubles enjoyed by this transmission line. SUB STATION S The trolley wire and feeders are supplied with 700-volt direct-current from four motor-generator substations located about10 miles apart. One substation is installed within the powerhouse at Lagoon. The substation installations are similar andeach includes one 400-kw motor-generator set receiving 2300-volta. c. and delivering 700-volt d. c. Banks of three 150-kw water-cooled oil-insulated transformers receive current from the trans- ELECTRIC RAILWAY JOURNAL. [Vol. XXXVII. No. 16. mission line at 45,000 volts potential and deliver it to the motorsat 2300 volts. The generating and substation apparatus is chieflyof General Electric manufacture. The building design of the substations conforms to that ofthe power house, having concrete foundations, floors and roofswith brick side walls. A floor plan of one of these substations. Salt Lake & Ogden Railway—Section Through High-Ten-sion Bay of Power House is shown. This design is standard for all stations. The build-ing provides a generous amount of floor space for the accom-modation of duplicate motor-generator sets and attendant ap-paratus. An aisle and tracks between the high and low-tensionsections of the substation furnish an economical means forhandling heavy apparatus directly into the substation on cars. In general the wiring plan of the substations is similar tothat in the power house. All high-tension leads are brought intothe building through roof insulators. The circuits of the 45,000-volt, three-phase power line pass through choke coils just be-low the roof insulators, thence through disconnecting switchesto underhung buses supported on post-type insulators. Fromthese buses connections are made to K-10 oil switches whichthrow the transformers onto the line. All the high-tension con-nections are made with Y^-m. copper t
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