. Electric railway journal . d operating at the highest allow-able rotative speed. The allowable speed was determinedpartly by the strength of the materials and partly by thenecessity for having a fairly quiet machine, the substationsbeing located in residential neighborhoods. The speed of the armatures is 514 approximatelyand there are 14 poles. The diameter of the commutatoris in., appearing very small for the 6-ft. armature. Noprovisions are made against centrifugal forces other thancareful design of the parts. The armatures of the 1500-kw rotaries are 6 ft. indiameter and weig
. Electric railway journal . d operating at the highest allow-able rotative speed. The allowable speed was determinedpartly by the strength of the materials and partly by thenecessity for having a fairly quiet machine, the substationsbeing located in residential neighborhoods. The speed of the armatures is 514 approximatelyand there are 14 poles. The diameter of the commutatoris in., appearing very small for the 6-ft. armature. Noprovisions are made against centrifugal forces other thancareful design of the parts. The armatures of the 1500-kw rotaries are 6 ft. indiameter and weigh 10 tons each. The current and fluxdensities are much below usual values and very conservativevalues of current density under the brushes were commutating poles have but one turn each placed nearthe armature to secure minimum magnetic leakage. Themagnetic circuits of the commutating poles are designedfor low saturation and therefore for maximum sensitive-ness. No inductive shunts are used with the commutating-. 16 Outgoing v v P . Feeders Series Booster Total Batterv Booster Regulator [ Copper b s }i Incoming LinesJiote: All Panels to have Section A-A Rear Elevation Section. B-B Section C-C Electric Cleveland Power—Front and Rear Elevations of Switchboard The iron pipes furnish the necessary choking effect todivert lightning discharges through the arresters and thusrender the use of choke coils unnecessary. In addition tothe outdoor arresters static discharges are provided on thebusbars and aluminum electrolytic arresters are connectedacross the converters. In case of storm the storage batteryis also connected across the converters without resistance,insuring almost perfect protection. The ground connectionis made to a 200-sq. ft. plate buried in permanently moistearth and bonded to the rails. 60-CYCLE ROTARY CONVERTERS The rotary converters are of novel design constructed inaccordance with specifications prepared by the power de-partment of the
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