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Proceedings Paper

Electrical fault location for surface-mounted feeders in metallic conduit
Author(s): Sean Finneson
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Paper Abstract

Manufacturing, warehouse and process control facilities utilize surface mounted metallic raceways to serve as electrical distribution in service entrance, feeders and subfeeds. This network of power distribution is susceptible to electrical faults through the breakdown of the conductors insulation. Typically, due to the high power associated with these circuits, faults produce explosive events creating shorted phases. Though these conductors are protected by devices rated for their ampacity, during a fault, a short circuit generates instantaneous current limited only by the primary source, system impedance and the time required for the protective device to respond. As a result the fault creates a high resistance junction, an artifact left behind by the fault event. Once this circuit has been identified and both the primary and secondary lifted, the path through the conductors and/or conductor to ground needs to be marked. After verification, a constant current dc source, not to exceed the ampacity of the conductor, is connected to the circuit. Energizing the junction generates heat due to its greater resistance. The heat is transferred to the surrounding raceway, yielding the fault's location when thermally scanned.

Paper Details

Date Published: 28 March 1995
PDF: 9 pages
Proc. SPIE 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (28 March 1995); doi: 10.1117/12.204845
Show Author Affiliations
Sean Finneson, Electro-Tek (United States)

Published in SPIE Proceedings Vol. 2473:
Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications
Sharon A. Semanovich, Editor(s)

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