In this paper we present the follow-up of our work on the assessment of pantograph arcs during loss-of-contact transients. It is not easy to accurately detect the gap between the contact strip of the pantograph and the contact wire on the fly. Instead, in the European Standards EN50119 the measurable arcs are used in the performance criteria. This paper addresses the issue of arc detection from two aspects: arc image and arc intensity. Using the arc intensity sensors and an action camera we performed two field tests to verify the speculation that arc intensity does vary in different directions. This implies the requirement of more than one sensor in the detection of arcs, and the need to combine the outputs of all sensors to obtain an effective measure of arc intensity. Both issues are addressed in this paper using video clips and measurement data conducted in a field test in Taiwan.

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