. Test of a delco lighting plant . 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, ^^^ 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
. Test of a delco lighting plant . 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, ^^^ 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 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 that outlined inthe standardization lules, and isin brief as follows; The speod v/a,s keptconstant at 1000 by means of the field. 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;^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 in theengine. The luost .^ethod, which pre-sented itself for the deteriiiination of tneabove losses, was tnat of the calibrated 61 ])ata Sneet Bo, 5* Calculation of of i-rinatureand Field of Generator. Temperature of Field at 100°F. Voltmeter /.cross Switchboard Terminals. Av. I
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