Download e-book for iPad: 62.Vehicular Technology by John G. Webster (Editor)

By John G. Webster (Editor)

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Ac low-frequency electrified transport system. switching apparatus, while negative busbars, under normal conditions isolated from the ground (by a spark gap or special grounding equipment) is connected to the rails via return feeders. However, in some systems the polarity is reversed, and the catenary is connected to negative busbars. Return Network of DC Systems. The return network (RN) of a dc power supply is composed of running rails and return feeders. In order to lower the electrical resistance, the rails of the track (for double-track lines, of both tracks) are connected in parallel, with the installation of special impedance bonds on sections with track circuits [Fig.

When one feeder supplies one section one refers to unilateral supply; when two feeders from different sides supply a section of catenary, to bilateral supply. When sections of catenary for parallel tracks are connected GROUND TRANSPORTATION SYSTEMS 7 Fig. 4. Dc electrified transport system power supply. together, this connection is called track-sectioning equipment (or parallel connection points); when equipped with high-speed breakers (HSBs), the combination is called a traction sectioning cabin [Fig.

2(a)], shoe-type [Fig. 2(b)], bow collector, and pantograph (Fig. 19). The pantograph’s pan head is made of Cu, graphite, or metal-plated carbon with addition of lubricant. During running of the EV its pantograph, pushed by a force F, raises the contact wire (CW) to a height h that depends on F, the CW’s elasticity, the speed of the vehicle, the vibration of the vehicle, and the pantograph’s mass. (In Fig. 19 two positions of the pantograph are shown: at the point A close to the support, and at B, the midspan of the OC, with heights denoted respectively as hA and hB ) The total force F is the sum of the following forces: 30 GROUND TRANSPORTATION SYSTEMS Fig.

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62.Vehicular Technology by John G. Webster (Editor)

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