Search results
Results from the WOW.Com Content Network
The current collection device presses against the underside of the lowest wire of an overhead line system, which is called a contact wire. Most overhead supply systems are either DC or single phase AC, using a single wire with return through the grounded running rails. Three phase AC systems use a pair of overhead wires, and paired trolley poles.
It is a type of current collector. The use of overhead wire in a system of current collection is reputed to be the 1880 invention of Frank J. Sprague, [1] but the first working trolley pole was developed and demonstrated by Charles Van Depoele, in autumn 1885. [2] Machining spare trolley pole wheels
The electric transmission system for modern electric rail systems consists of an upper, weight-carrying wire (known as a catenary) from which is suspended a contact wire. The pantograph is spring-loaded and pushes a contact shoe up against the underside of the contact wire to draw the current needed to run the train.
Washington, D.C., had a large network of conduit lines to avoid wires, as required by an 1889 law. Some lines used overhead wires when they approached rural or suburban areas. The last such line ran to Cabin John, Maryland. The current collector "plow" was mounted underneath the car on a fitting just forward of the rear truck on PCC streetcars ...
The auxiliary wire can be of a more conductive but less wear-resistant metal, increasing transmission efficiency. Earlier dropper wires provided physical support of the contact wire without joining the catenary and contact wires electrically. Modern systems use current-carrying droppers, eliminating the need for separate wires.
Seville Tram equipped with CAF ACR ground-level power supply, 2019. Ground-level power supply, also known as surface current collection or, in French, alimentation par le sol ("feeding via the ground"), is a concept and group of technologies that enable electric vehicles to collect electric power at ground level instead of the more common overhead lines.
President-elect Donald Trump’s policy agenda is generally good for business, top executives and analysts told me at the Goldman Sachs Industrial and Materials conference this week. “It’s ...
OK, references -- this article doesn't have any. It is also missing at least two current collection methods. London, and some other systems, used to operate streetcars that didn't collect their power from a third rail, or an overhead wire. Rather, they used a system where the current was collected from a slot buried in the roadway -- something like a model railcar -