Electrochemical and metallurgical industry . the number of turns by a switching device,thus varying the voltage of the secondary. A good example of the first method is found at the worksof the International Acheson Graphite Company, where 750-kw. resistance furnaces are used. The current is supplied at2200 volts and is brought to a 25-cycle, 800-kw. transformerwhich delivers a secondary current at 140 volts. The regula-tor is a 6-pole, 560-kw., 25-cycle apparatus with 140 volts pri-mary, and 60-volt, 9350-ampere secondary. By means of theregulator the voltage of the current delivered to the fu
Electrochemical and metallurgical industry . the number of turns by a switching device,thus varying the voltage of the secondary. A good example of the first method is found at the worksof the International Acheson Graphite Company, where 750-kw. resistance furnaces are used. The current is supplied at2200 volts and is brought to a 25-cycle, 800-kw. transformerwhich delivers a secondary current at 140 volts. The regula-tor is a 6-pole, 560-kw., 25-cycle apparatus with 140 volts pri-mary, and 60-volt, 9350-ampere secondary. By means of theregulator the voltage of the current delivered to the furnacescan be raised or lowered by 60 volts, thus giving either 3740amperes at 200 volts, or 9350 amperes at 80 volts, or the cor-responding current at any intermediate voltage. The follow-ing description of the regulator was kindly furnished to thewriter by Mr. W. S. Moody of the General Electric Co., whobuilt the apparatus. The punchings and windings of the regulator are assem-bled in a substantial oil-tight, cast-iron case having a semi-. FIG. 4.—.\RR.\XGEMEXT OF spherical cover which is made absolutely tight, so as to pre-vent dust and dirt getting into the gearing and operatingmechanism. » Both the stationary and movable cores arebuilt up solid of carefully annealed sheet-iron, provided witha large number of slots for the winding. The windings con-sist of formed copper bars carefully insulated and assembledin these slots. The ends of the windings_^ are brought out bymeans of flexible cables to a set of vertical bus-bars broughtthrough the center of the cover. In order to avoid an ex-cessive impedance in the device, and obtain as good a powerfactor on the system as possible, the windings are sub-dividedand the bus-bars of both transformer and regulator are ar-ranged so that the alternate bars are of the same sub-division of the regulator windings is obtained byconnecting all of the 6 poles of the machine in parrallel, andthe extremely low impedance
Size: 1913px × 1307px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
