Track circuit for AC electrified railways

Details Track circuit for AC electrified railways Track circuit for AC electrified railways

1985-03-07

1986-11-11

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Nonreciprocal gyromagnetic type

246 28R, 246 28K, 333168, 333175, 333177, H03H 7075, H03H 709, B61L 118

Patent

active

046225226

ABSTRACT:
The present invention provides a track circuit for AC electrified railways, formed by the two rails (R.sub.1,R.sub.2) of a railway section and comprising a transmitter (E) connected to one end of the track circuit for generating therein an alternating signal of given frequency and a receiver (R) connected to the other end for controlling the operation of a track relay (RV). A number of capacitive impedances (Z.sub.1,Z.sub.2, . . . Z.sub.n) with parallel inductance and capacitor (each having a middle point (3) connected to the ground) are connected between the rails (R.sub.1,R.sub.2) while being spaced apart over the whole length of the track circuit with a given pitch (P), depending on the values of the impedances, so that the transmission attenuation of the circuit at the operating frequency is always less than the transmission attenuation of a circuit having the same length formed by a rail with ground return.

REFERENCES:
patent: Re14774 (1919-12-01), Fortescue
patent: 1286401 (1918-12-01), Peter
patent: 1770705 (1930-07-01), Lucas
patent: 4487385 (1984-12-01), Salmon
patent: 4509024 (1985-04-01), Wilson

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