Circuit for detecting unbalance of the traction current in a tra

Details Circuit for detecting unbalance of the traction current in a tra Circuit for detecting unbalance of the traction current in a tra

1981-04-03

1984-02-21

Swann, III, Glen R.

Railway switches and signals

Block-signal systems

Automatic

246 1C, 246 34B, 340 47, 340651, 340652, G08B 2100

Patent

active

044325177

ABSTRACT:
In order to prevent a false signal being given in a circuit arrangement for detecting the presence of rolling stock on a track section, when a rail is grounded or fractured, a detecting circuit (31) is provided for detecting unbalance of the traction current. The unbalance detecting circuit is for association with a transmitter (20) for transmitting a track circuit current and an associated receiver (21). The unbalance detecting circuit has two current sensors (TA) which are connected to the ends of the rails (1, 2) adjacent to the receiver (21) for transmitting respective signals to the unbalance detecting circuit (31), and the unbalance detecting circuit transmits the track circuit signal to the receiver only when the signals detected by the current sensors are equal or when their difference is such as not to cause undue excitation of the receiver, and a pole change switch (30) for connection between the track circuit current transmitter and the ends of the rails associated therewith.

REFERENCES:
patent: 2277466 (1942-03-01), Thompson
patent: 2311034 (1943-02-01), Dodd
patent: 3387064 (1968-06-01), Joy et al.
patent: 3870952 (1975-03-01), Sibley
patent: 3970271 (1976-07-01), Auer et al.

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