Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-07-14
1978-09-26
Strecker, Gerard R.
Communications: electrical
Condition responsive indicating system
Specific condition
324 51, G01R 3102, G08B 2100
Patent
active
041174631
ABSTRACT:
Continuity detector apparatus is coupled into duplicate conductors connected in parallel between each rail of a track section and an energy source or occupancy receiver of an associated track circuit to detect and register a fault in either parallel conductor and to indicate need for corrective action to restore the operational security provided by the duplicate circuit paths. In one form, each detector is a two-winding relay with one winding inserted in series in each of the duplicate circuit paths so poled that equal track current flows in opposite directions in the winding, when both conductors are unbroken to hold the relay released. Any interruption of either parallel conductor causes the relay to pick up to register the fault and transmit a corresponding indication. In a second form, a different transformer winding is connected with each conductor. An alternating current voltage of selected frequency is applied to the other winding of one transformer which, if both track conductors are complete, causes a current to flow in a loop including each conductor. This produces an output from the other winding of the other transformer which is applied through a filter and amplifier to hold energized the detector relay. A break in either conductor interrupts the loop, deenergizing the relay which releases to register the fault and activate an indication to signal a need for repairs.
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McIntire, Jr. R. W.
Strecker Gerard R.
Westinghouse Brake & Signal Co. Ltd.
Williamson, Jr. A. G.
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