Acumulador de Carga Rápida
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Acumulador de Carga Rápida (ACR) (transl. fast-charging battery) is a battery electric tram system marketed by Construcciones y Auxiliar de Ferrocarriles (CAF) of Spain. Trams equipped with ACR are fast-charged while at stops; elsewhere they require no overhead line, which is desirable for reasons of safety, reliability, cost, and aesthetics.[1][2] It also allows regenerative braking where direct current electrification systems cannot return (much) energy to the grid.[citation needed]
ACR-equipped trams are powered between stops by discharging a rooftop supercapacitor battery, weighing around 1 tonne (2,200 lb), which gives a range of around 2 miles (3.2 km). The battery is partially recharged between stops by regenerative braking; at stops, it is completely recharged in around thirty seconds by current drawn via pantograph from a short section of overhead line.
Marketing
CAF offers ACR as an option on its Urbos 3 tram; for retrofitting on trams built by CAF or other manufacturers; and for standard gauge and metre gauge tram systems.
ACR's most direct competitor is the ground-level power supply (APS) marketed by Alstom; CAF differentiates ACR against APS through its support of regenerative braking. CAF claims that ACR could be useful in rapid transit systems for the same reason.