engleski

TECHNICALLY INCORRECT TRAMWAY EARTHING SYSTEM CAN CAUSE UNEXPECTED EFFECTS

Tram vehicle type TMK2100 was constructed from parts of the old type TMK201 (Đuro Đaković) and upgraded reconstructions and modernizations. Such “ hybrid” vehicle has shown a lot of incompatibilities between the old and the new parts. The paper deals with an unexpected and unpredictable incompatibility which caused two effects that couldn’ t be related at first look: aggressive corrosion of tram’ s metal parts and electromagnetic interferences on electronic equipment. The incorrect design of ground brushes, their cases and their wiring caused that current flew “ all over the tram’ s body” . The results of the measuring of the earthing currents implied the compensation parts as the solution to these problems.

Stray current of tramways; pda; noices

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