Publication: Electrical Industries
Chicago, IL, United States
Electric Power in Taftville Cotton Mill.
The advantages of electricity for power transmission is shown by the number of recent installations and especially in utilizing water powers at some distance from the factory. At Taftville, Conn., are located some important cotton mills using the power of the Shetugket river. In the mills of Mr. E. P. Taft at Baltic and Taftville, the valuable water rights of the river have been developed, and by an electric plant the power is distributed to the mills, replacing two 350-horse power engines.
In Fig. 1 are shown the relative positions of the generating station at Baltic and the receiving station at Taftville. The line is nearly four and one-half miles in length and is carried along the highway up the river, skirting its banks in places and crossing it at intervals to shorten its route. In the basement of this building are the wheel and dynamo rooms of the generating plant. Four hundred feet above the mill a dam 525 feet long has been thrown across the river. The effective head on the turbines is 32 feet and the water available, even in the driest seasons, is sufficient to furnish not less than 1,500-horse power. The turbines are belted to pulleys on the main line shaft, extending the whole length of the wheel room and continuing through the partition walls into and along one side of the generator room. The pulleys are thrown into, or out of, action by Hunter clutches mounted with pulleys on quills, so that any or all of the wheels can be applied to driving the shafts. Similar pulleys and clutches are furnished in the dynamo rooms for throwing in or out the various machines that may there be placed.
Fig. 2 shows the wheel room and the arrangement of the turbines and line shaft. There are three double 42-inch horizontal wheels and one double 27-inch wheel, the former developing 800 effective horse power, at 157 revolutions per minute, and the latter 300 horse power at 244 revolutions per minute. The belts pass obliquely upward to the pulleys on the line shaft, and the turbines are kept at speed by Schenck electric governors, which have proved themselves capable of doing very fair service. The wheel plant and shafting were made and installed by the P. C. Home Company, of Gardiner, Maine. The line shafting is supported by heavy iron girders set on stone piers and additionally braced by timbers. The dynamo room, beside the shafting, is occupied by two 250 K. W. General Electric three phase generators, delivering current to the line at 2,500 volts. Each machine is provided with its own exciter, a 3 K. W. bipolar dynamo. The three-phase machines run at 600 revolutions per minute, and are set so firmly on substantial foundations as to run with scarcely a perceptible vibration. The driving pulleys on the main shaft are fitted with Hunter clutches, so that either machine can be dropped out without the slightest disturbance to the service. The line, a characteristic bit of which is shown in Fig. 4, is a good piece of construction work on substantial wooden poles placed 100 feet apart. The upper wires on the cross arms are of No. 0 bare copper and form the original three-phase circuit designed for the transmission. The wires on the lower cross arm are No. 0000 insulated wire, and are four in number. They were originally intended for a railway circuit, the generators for which were to be installed at Baltic to feed the Norwich Street Railway; but as the amount of copper necessary to do the work successfully appeared too great, the system was