Switching Surges with Very Long Fronts (above 1500 μs): Effect of Front Shape on Discharge Voltage

Carrara, G.; Dellera, L.; Sartorio, G.

doi:10.1109/tpas.1970.292723

Cited by 25 publications

(1 citation statement)

References 3 publications

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“…Thus, the statistical value of the front time for switching overvoltage waveform is in the range of 0.5~2 milliseconds (ms), and much greater than that of the standard switching impulse proposed by the International Electrotechnical Commission (IEC) standards. The computation and field record waveform showed that the front time in switching the overvoltage waveform was greater than 1000 microsecond (µs); on the other hand, wave front time is associated with the transmission distance [4][5][6]. Furthermore, the effect of a long front time in switching impulse insulation deserves consideration.…”

Section: Introductionmentioning

confidence: 99%

Continuous and Discontinuous Streamer Leader Propagation Phenomena under Slow Front Impulse Voltages in a 10-meter Rod-Plane Air Gap

Shah

et al. 2018

Energies

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Investigation of positive streamer-leader propagation under slow front impulse voltages can play an important role in the quantitative research of positive upward lightning. In this work, we performed a large-scale investigation into leader development in a 10-m rod–plane gap under a long front positive impulse. To describe the leader propagation under slow front impulse voltages, we recorded the leader propagation with a high-speed charge coupled device (CCD) camera. It is important to figure out this phenomenon to deepen our understanding of leader discharge. The observation results showed that the leader mechanism is a very complex physical phenomenon; it could be categorized into two types of leader process, namely, continuous and the discontinuous leader streamer-leader propagation. Furthermore, we studied the continuous leader development parameters, including two-dimensional (2-D) leader length, injected charge, and final jump stage, as well as leader velocity for rod–plane configuration. We observed that the discontinuous leader makes an important contribution to the appearance of channel re-illuminations of the positive leader. To clarify the above doubts under long front cases, we carried out extensive experiments in this study. The comparative study shows better results in terms of standard switch impulse and long front positive impulse. Finally, the results are presented with a view toward improving our understanding of propagation mechanisms related to restrike phenomena, which are rarely reported.

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Section: Introductionmentioning

confidence: 99%