International Library of Technology · Scranton, International Textbook Co. · leaf 84
no faults, the dropfrom bar to bar shouldbe the sam.e for all thebars. The connectionsfor this test are shownin Fig. 27. E is the linefrom which the currentfor testing is obtainedand L B 2i lamp bankby means of which thecurrent flowing throughthe armature may beadjusted. Connectionis made with the… … Fig. 27. 70 OPERATION OF 10 millivoltmeter, G. For the sake of illustrating the way inwhich the bar-to-bar test will indicate various kinds of faults, we will suppose that incoil.iV there is a shortcircuit, that the commu-tator leads of coils S,K, and ^Fhave beenmixed, as shown, and thatthere is an…
Electrical engineering
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