New PDF release: 62.Vehicular Technology

By John G. Webster (Editor)

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4) the ETPSS includes ac power supply lines (high or medium voltage) transmitting power from the power utility system to ac–dc traction substations. Ac 8 GROUND TRANSPORTATION SYSTEMS Fig. 5. Ac industrial-frequency electrified transport system: (a) general scheme, (b) with booster transformer, (c) with special three-phase–two-phase transformers, (d) with auto transformer (AT). three-phase power delivered to the TS is then converted to dc power at the required voltage. Mostly 6- or 12-pulse diode rectifiers are used.

A scheme for a maglev car. electrodynamic (as in the Yamanashi and Miyazaki test lines in Japan), and may make use of superconducting materials. This system has following advantages over the conventional ones: • • • • • • No adhesion needed for drive or for braking, the resistance to motion being solely aerodynamic, so that higher gradients and sharper curves can be used Maintenance of horizontal (lateral) position by magnetic forces No contact vibration and less noise, as there are no rolling wheels or rails Minimum maintenance High safety and reliability at speeds up to 500 km/h No catenary, as power is delivered to the guideway.

Protection of DC Traction Systems. The ETPSS must maintain the power supply with high reliability and must detect and quickly eliminate fault conditions. This accomplished by installing dc HSBs to protect every feeder from short circuit (SC). An HSB clears the fault in 15 ms to 30 ms, depending on the inductance and resistance of the circuit and the internal tripping time of the HSB. Usually an HSB trips when the 10 GROUND TRANSPORTATION SYSTEMS Fig. 7. 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.

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

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