Since the beginning of the century steel contact rail has been chosen as the most economical and effective material for heavy traction railroads, despite its relatively high resistance compared to other elements of the system. But by today's standards, the system so designed is not necessarily the system with the lowest life cycle costs. The demand for a higher grade third rail with lower electrical resistance and longer service life led to developments at the start of the seventies which resulted in a co-extruded aluminium section with a stainless steel waering surface. This is a composite conductor rail which combines the high electrical conductivity of aluminium with the wear resistance of stainless steel. It is the only conductor rail known to date with metallic bonding between steel and aluminium made by co-extrusion. Experience on several transit systems have shown that the proper use of co-extruded contact rail can reduce overall electrification system installation and operating costs while improving system performance. Composite rail can reduce: - energy losses - voltage drop - number of substations - rectifier rating - installation costs and last not least - the life cycle costs of the system. Composite rail can improve the available voltage at the train as well as the short circuit current for section openings and the efficiency of cars with regenerative braking.
Co-extruded aluminium steel contact rail for electric railways
Stranggepresste Aluminium-Stahl-Kontaktschiene fuer elektrische Bahnen
1987
4 Seiten, 3 Bilder, 1 Tabelle
Aufsatz (Konferenz)
Englisch
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