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ReportsTutorial: Series Arcing and DFA Switch/Clamp

Introductory Overview

Tutorial SeriesArcing TSA03 1The DFA technology system detects and reports multiple types of events that occur along the length of a distribution circuit.1 One type of event is series arcing. Series arcing often results in low-amplitude variations in line current and voltage and represents an incipient failure, or “hot spot,” that is developing in the jaws of a load-carrying line device, such as a switch or a clamp. The condition can exist for hours, days, or weeks without customer complaints or other notice to the utility. It causes progressive erosion of line conductors and of the affected device’s contacts and ultimately can result in intermittent voltage fluctuations, flickering lights, unexplained protection operations, and even broken conductors.

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