Contact System

Contact System

 

equipment used for the transmission of electric power from power plants through traction substations to electric locomotives, motorized railroad cars, streetcars, and trolleybuses. The power is transmitted by means of a sliding contact between an overhead wire of a contact rail and the current collector (or pantograph) of the rolling stock. As a rule, the overhead wire is located above the rails or along the route of a railless transportation line; contact rails are located at the same height as the undercarriage of rolling stock. The overhead wire is mounted on a supporting structure—usually the supports of the contact system or, less frequently, the walls of buildings and other structures (for streetcar and trolleybus systems)—by means of flexible components (cables and wires) located parallel to the overhead wires (catenary suspension) or across it (direct suspension). The supports of a contact system are made of reinforced concrete, steel, or wood. The suspensions are attached to the supports by fittings and insulators.

A contact system is divided into sections to achieve reliability of operation and ease of maintenance. A single section may include open lines and intermediate stations or, in large stations, a group of electrified tracks. Maintenance work requiring a power shutdown is conducted with only one section disconnected, without interruptions of power supply to other sections. The supports of the contact system located along railroad tracks are also used for suspending conductors supplying power to railroad consumers along the right-of-way and as supports for other conductors, such as those used for remote control of sub-stations and for operating various types of switching gear used in the sectioning of circuits.

REFERENCES

Vlasov, I. L, and K. G. Markvardt. Kontaktnaia set’, 2nd ed. Moscow, 1961.
Fraifel’d, A. V., A. S. Markov, and G. A. Tiurnin. Ustroistvo, montazh i ekspluatatsiia kontaktnoi seti, 2nd ed. Moscow, 1967.
Beliaev, I. A. Vzaimodeistvie tokopriemnika i kontaktnoi setipri vysokikh skorostiakh dvizheniia. Moscow, 1968.

K. G. MARKVARDT

References in periodicals archive ?
At the world's largest business-to-business trade show for electric and hybrid mobility, ITT will debut its high-performance, cooled ultra-fast charging DC solution as well as an improved contact system for its global portfolio of AC charging solutions.
The MPC system employs the LFH stamped-and-formed contact system, which the company said helps ensure a reliable electrical interface for applications requiring multiple insertions.
The high-density Oval Contact System (OCS) features improved signal integrity via reduced cross talk as well as enhanced attenuation performance.
These connectors utilizes the unique PosiBand contact system, which is a closed entry female contact system that provides lower average insertion force during mating, and enhanced reliability and increased electrical performance over legacy designs.
It is housed in an aluminum shell with W/LCP dielectric and features a twist pin contact system and crimped gold plated contacts.
Provides cable-to-board solutions for the TFM/SFM Series board-to-board interconnect system and features the Tiger Eye contact system.
By integrating Amcat's web-based appointment scheduler and automated outbound contact system with Merchant Lynx's database, Merchant Lynx has gained an automated appointment setting and customer acquisition process which has helped improve agent productivity.
Further, the switch employs a spring contact system which allows for mounting on equipment housing through pressing on the PWB, thus enhancing mounting stregnth as well as raising reliability.
Existing SmartCity customers may choose to continue using their contact system, or they may migrate their entire system or specific applications, such as physical or logical access, to contactless over time.
The proven insulation displacement connector contact system delivers a true "gas tight" connection for both stranded and solid discrete wires.
medical device manufacturers and design engineers who want to see and touch the SYGNUS[TM] Implantable Contact System before the end of 2010 will have one final opportunity to do so at this week's BIOMEDevice show in San Jose, California.
Methode Power Solutions Group introduces its new RK Series Power Contact System for applications requiring high current DC connections and minimal voltage drop.