Monitoring device for de-energized catenary systems or overhead lines
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United States of America Patent
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Sep 16, 2014
Grant Date -
Nov 15, 2012
app pub date -
Jul 9, 2010
filing date -
Dec 29, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A monitoring device for de-energized catenary systems having bearer cables, contact wires, droppers, grounding lines, overhead lines and cable systems, during new construction or servicing work, to counter theft, is easy to implement, can be installed quickly and enables monitoring of predetermined track sections. Catenaries or overhead lines or cable systems are divided into segments, each consisting of two parallel strands, by forming a line resistance at one end by short-circuiting the strands of each segment, by connection each of the free ends of the segments with a respective measuring resistor of a predetermined size and a respective voltage source to form a respective closed circuit, and by each circuit being connected to a measuring unit for measuring loop current. The measuring unit is equipped with a monitoring device for triggering an alarm device when a predetermined limit value is exceeded or the loop current is interrupted.
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