Lecturer Eng. Elena-Daniela OLARIU PhD, Prof. Eng. Dorel CERNOMAZU PhD, Assoc. Prof. Eng. Leon MANDICI PhD
Rezumat
In rola de contact utilizata in cadrul dispozitivului colector de la transformatoarele cu reglaj continuu al
tensiunii sub sarcina unde are loc o distributie neuniforma a curentului, rezistenta ohmica a traseului conductor prin
aceasta nu se poate calcula cu formula clasica, iar din aceasta cauza, in circuitul inchis format din spira
scurtcircuitata de catre rola apare un curent de scurtcircuit, factor determinant pentru producerea unei supraincalziri
locale apreciabile, in special in zona punctelor de contact.
Cuvinte cheie: contact alunecatorpierderitransformatorscurtcircuit
Abstract
In the sliding contact which is used at the transformers with continuously adjustable voltage under load occurs
an irregular distribution of current and therefore the ohmic resistance of conductor route through the sliding contact can
not be calculated with the classical formula, and in this case, in the closed loop consisting of the spire which is shorted by
sliding contact it is produce an short-circuit current, the determining factor for the production of a considerable local
overheating, especially in the points of contact
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