Method and system for calculating railroad track ballast...

Details Method and system for calculating railroad track ballast... Method and system for calculating railroad track ballast...

2007-11-13

2007-11-13

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S693000, C246S121000

Reexamination Certificate

active

11242333

ABSTRACT:
A method of estimating a resistance value for ballast, over a given length of track, used at a crossing on a railroad track that has a crossing warning system where a inductance of the track over the given length, an inductance of the track over the given length of the track, a capacitance of the track over a given length of track, and an operating frequency of the warning crossing system are all known, the method including calculating a track impedance having a magnitude and a phase angle, applying a current waveform and a voltage waveform through the track at a known frequency, measuring the phase angle, calculating a ballast resistance by using the measured phase angle in place of the calculated phase angle, the given track length, resistance over the given length of track, inductance over the given length of track, capacitance over the given length of track, and the operating frequency.

REFERENCES:
patent: 3246143 (1966-04-01), Steele et al.
patent: 3614418 (1971-10-01), Pell
patent: 3614634 (1971-10-01), Jones et al.
patent: 3870952 (1975-03-01), Sibley
patent: 3977634 (1976-08-01), Smith
patent: 4324376 (1982-04-01), Kuhn
patent: 2007/0132463 (2007-06-01), Anderson

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