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Systems Approach to Electriﬁed Ground Transportation In order to represent the technical complexity of electrified ground transportation (EGT) treated as a multivariable system, the rail system may be divided into a finite number of subsystems (Fig. ) according to expected and real transport service demand U 6 = return current of EVs; mechanical load on track due to EV movement GROUND TRANSPORTATION SYSTEMS 35 Fig. 25. Electrified ground transport system divided into a number of subsystems. , public power supply system and its power capacity) Compatibility with existing transport systems Cost–benefit analysis of different options The choice of the system voltage determines the required parameters of the power supply structure, the rolling stock, and the surrounding technical infrastructure.
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. 7(a,b,c)]. 6 kV dc traction systems. 5 kV, and 3 kV dc systems, while main railway lines electrified with 3 kV dc utilize bilateral supply with traction sectioning cabins. The main purposes of bilateral supply with traction sectioning cabins are lowering voltage drops, improving short-circuit protection, sharing current between different feeders, improving flexibility of the power supply, and, in case of a feeder or TS failure, the capability of switching equipment to make rearrangements to maintain power supply through an adjoining feeder or TS.
6. 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.