The properties of streamers traveling over the surface of oil-immersed solid dielectrics were experimentally studied under lightning impulse conditions. Streamer polarity and the position of a grounded side electrode significantly affected the relationship between the streamer extension length and the applied voltage. The solid surface charging had also a large effect on the streamer propagation. However, the streamer propagation properties showed a consistent dependence on the potential at solid-liquid interfaces. In addition, the potential drop inside the streamer channel was found as a function of normalized streamer length. The streamer appeared to progress in a constant velocity.
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