File:Test of a delco lighting plant (1917) (14771853565).jpg

Identifier: testofdelcolight00porg (find matches)
Title: Test of a delco lighting plant
Year: 1917 (1910s)
Authors: Porges, Edward D Given, Louis E
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Contributing Library: Paul V. Galvin Library, Illinois Institute of Technology
Digitizing Sponsor: CARLI: Consortium of Academic and Research Libraries in Illinois

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otwo ptirts, an armature loss and a field loss;these may be expressed ^^s arm. copper loss = la^-atbifield copper loss = ^^^^^» where I is the armature current. If tv,Q shuntfield current, P.gtb ^^^ resistance ox the 58 TEST 01 A DELCO LIGHTING PL^illT. armature and brushes, and ^ the resistanceof the field. The stray load loss consists of thehysteresis and eddy current losses, and thefriction and aindage losses. As the l^^tterlosses are dependable upon the speed of themachine, they will be constant for a gjvenspeed. The hysteresis and eddy current losseswill vary v.ith both the speed and the voltageof the machine. In determining the stray load loss,the field circuit was ope^ied, and an aauiieterand rheostat inseroea as snown in Mg. 1£.This figure also shov/s tne uieans of apply-ing a variable voltage raross the armature. The procedure v.as that outlined inthe A.I.E.E. standardization lules, and isin brief as follows; The speod v/a,s keptconstant at 1000 R.p.m. by means of the field
Text Appearing After Image:
60 TEST 0? A LELCO LlaKTIiJG PLAKT. riieostat, and readings were taken ox instru-u^ents at various voltages, Iro^ a maxiiaUia of70 volts to ij ..linimum of 18 volts. The re-sults v/ere tabulated in data sneet i\o. 6. The stray load, as shown in thic datasheet, was equal to total ira^ut minus thecopper losses. To obtain the copper losses,reference was made to values of resistances,s-iven in the curves on pas^e 62, The curveobtained from data sheet I^o. 6 is shown onpa ge 64. i;eteru.in^tion of the Friction andjVindage Losses. It vras desired to ^ecure an idea ofthe rel-tive values of tne lo^ssii due tofriction, windage, and co..pr33Sion in theengine. The luost si..-ple .^ethod, which pre-sented itself for the deteriiiination of tneabove losses, was tnat of the calibrated 61 ))ata Sneet Bo, 5* Calculation of F.esistance of i-rinatureand Field of Generator. Temperature of Field at 100°F. Voltmeter /.cross Switchboard Terminals. Av. I 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 30.0 Av. V

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