File:Transactions (1871) (14596461418).jpg

Identifier: transactionsmining63amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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h their supports. The 2300-voltcircuit is carried into the building by means of lead-covered cables andconnected to a five-panel switchboard. Panel 1 is equipped with a 2300-volt check meter and an automaticmain oil circuit breaker. From this panel extends a 2300-volt bus locatedback of the other panels permitting connections to the various loads.Panel 2 controls the main underground feeder; panel 3 controls the 1350- H. W. YOUNG G25 horsepower main hoist motor; panel 4 controls a 250-horsepower air-shaft motor; and panel 5 controls the machine-shop and yard-hghtingUne. Each panel is equipped with automatic oil switches and the neces-sary instruments. The underground cable from panel 2 terminates at a panel on whichare mounted two automatic oil switches. The cable from one switch hasa tap line to which are connected twenty underground substations, eachstation being equipped with three 25-kv-a. transformers and an oilswitch. The feeder voltage of 2300 is transformed to 220 for use with
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Fig. 7.—Scholz substation. alternating-current coal-cutting machines. On the same feeder cable isconnected a 300-kw. 2300/220-volt motor-generator set supplying directcurrent for the main haulage trolley. This motor-generator set alsosupplies current to twelve stations for charging the storage batterylocomotives. The other switch and cable supphes power to a 100 kw.2300/220-volt motor-generator set for the main haulage direct-currenttrolley and also connects to twentj-^ underground substations for supply-ing 220-volt alternating current to the coal-cutting machines. The 75-kw. underground substations are at more or less temporarylocations so that equipment can be moved as the work progresses, thusavoiding long secondary runs and giving full voltage to the motors.Control of the 1350-horsepower hoist motor will be secured from theunderground substation located near the base of the shaft. The operator,by means of switches and indicating devices, has positive control of the VOL. LXIII.

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