. The Street railway journal . o-vember. Both are direct connected to Mcintosh & Sey-mour 4100-hp vertical cross-compound engines. They aredesigned for 575 volts at a speed of 90 revolutions perminute, but are capable of wide voltage range at all loads,and at the voltage for which they are designed are guar-anteed to deliver 2700 kw continuously with a tempera-ture rise not to exceed 35 degrees C. in any part above thesurrounding air, also 50 per cent overload or 4050 kw fortwo hours following the normal run, the temperature risenot to exceed 5 degrees C, and to withstand a momentaryoverload o
. The Street railway journal . o-vember. Both are direct connected to Mcintosh & Sey-mour 4100-hp vertical cross-compound engines. They aredesigned for 575 volts at a speed of 90 revolutions perminute, but are capable of wide voltage range at all loads,and at the voltage for which they are designed are guar-anteed to deliver 2700 kw continuously with a tempera-ture rise not to exceed 35 degrees C. in any part above thesurrounding air, also 50 per cent overload or 4050 kw fortwo hours following the normal run, the temperature risenot to exceed 5 degrees C, and to withstand a momentaryoverload of 100 per cent or 5400 kw Mithout injury. No change whatever in the brush setting has to bemade from no load to momentary overload condition of100 per cent, and the circuit breaker can be tripped underany condition of load between these limits without ap-preciable disturbance at the brushes. In fact, the pro-vision for shifting brushes is almost superfluous on thistype of machine, as with the brushes once adjusted for best. 2700-KW C( J(.), GKNKRAToK INSTALLKD IN I!OST(JN commutation it is never necessary to alter their position,sparkless commutation being assured under all conditionsof load. Moreover, the machines may be successfully runin parallel with other machines of the non-conimutatingpole type, no trouble whatever being experienced in paral-leling the machines with others in the Boston stations. The magnet frame is of cast iron, rectangular in shape,made in six sections securely bolted together and of thebox section type, forming a most rigid structure for sup-porting the numerous poles with their heavy field coils. The main poles are rectangular cast steel, with laminatedpole-faces and the commutating poles are laminatedthroughout. Field coils are compound-wound and of thewell-known G. E. ventilated type. The armature core, formed of steel punchings, is rigidlyheld to a cast-iron spider of substantial proportions bymeans of numerous dovetails. Effective
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
