Electrical fault location for surface-mounted feeders in metallic conduit

Sean Finneson

doi:10.1117/12.204845

28 March 1995 Electrical fault location for surface-mounted feeders in metallic conduit

Sean Finneson

Proceedings Volume 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications; (1995) https://doi.org/10.1117/12.204845
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

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.

Citation Download Citation

Sean Finneson "Electrical fault location for surface-mounted feeders in metallic conduit", Proc. SPIE 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (28 March 1995); https://doi.org/10.1117/12.204845

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KEYWORDS

Resistance

Amplifiers

Carbon

Copper

Dielectrics

Manufacturing

Power supplies

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