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21(a). An OC with the messenger wire first tensioned without the TE and the contact wire tensioned with the use of the TE is called half-compensated [Fig. 21(b)]. If both the messenger wire and the contact wire are tensioned with the TE [Fig. 21(c,d)], the OC is called fully compensated. The contact wire is usually made from Cu, possibly alloyed with Ag or Si; typical cross sections are 100 mm2 to 170 mm2 . A messenger wire is typically made of Cu, bronze, steel, or combined steel and aluminium, with cross section 50 mm2 to 180 mm2 .
Low-floor, easy-access streetcars allow one to use traditional routes and drive smoothly into city centers. Nonconventional solutions include people-movers, mini-trams, and fully automated guided transport (Lille, France, 1983; Docklands, London, 1987; SkyTrain, Vancouver, 1986; Automated Skyway Express, Jacksonville, FL, 1992) on special guideways or monorails, used over short distances in areas where efficient passenger transport is in heavy demand (as in airports and at expositions) and needs to be integrated effectively with other transport modes (such as the Chiba Urban Monorail System in Japan).
Schemes for sectioning the catenary of a two-track railroad: (a) unilateral supply from one TS, (b) bilateral supply from two TSs, (c) bilateral supply with traction sectioning cabin. instantaneous value of the current exceeds the preset value Is (instantaneous series trip relay). When the SC happens close to the TS, the steady-state current may reach tens of thousands of amperes, which has to be within the switching-off capacity of the HSB. For a distant SC the minimum current ISCmin (which depends on the resistance of the circuit and the TS and the system voltage) may be lower than the maximum load current IL .