Means for use on a railroad to distinguish between traction curr

Details Means for use on a railroad to distinguish between traction curr Means for use on a railroad to distinguish between traction curr

1982-05-06

1983-11-22

Swann, III, Glen R.

Communications: electrical

Selective

Having indication or alarm

246 34B, 246187B, 340658, B61L 2100, G08C 1928

Patent

active

044172290

ABSTRACT:
Means for differentiating between traction current and signal current in an electrified railroad includes a first input transformer providing an input signal of the same frequency and phase as the track signal current. A second input transformer is connected to the track to provide a track signal. There are means for comparing the phase and frequency of the input signal and the track signal and means responsive to an output from the comparison means indicating a correct comparison for providing a relay driving signal.

REFERENCES:
patent: 3428868 (1969-02-01), Duckitt et al.
patent: 3715669 (1973-02-01), La Forest
patent: 3992698 (1976-11-01), Sahasrabudhe et al.
patent: 4065081 (1977-12-01), Huffman et al.
patent: 4222045 (1980-09-01), Cholin
patent: 4320881 (1981-03-01), Campbell

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