electrical treeing branch is conducting or non conducting .... I mean a single electrical treeing branch is continous or discontinus in nature?...could please explain it
@TreaHuggs
6 ай бұрын
If the conductor is inside the insulator, how could the PD start from the outside?
@NRS_Navisun
3 ай бұрын
I'm pretty sure it comes down to (2) factors: 1) a deformity in between the layers, whether that might be from a crease in or scrape of material, and 2) a third substance presence in the void left by the deformity. The deformity introduces a non-homogenous / heterogenous concentration of electric field lines, and those concentrations change what the voltage gradient looks like near the deformity. So higher voltages due to "cusps" or "corners" if you remember discontinuities from math class. Since the electric field is everywhere between the inner conductor and outer insulation, as long as there is an interface between layers along that electric field, then PD can happen. It could start near the conductor, or near the outer insulator, or even somewhere in the middle and branch out in opposite directions. Also, most of the time PD is talked about in an AC context, so the electric field will flip multiple times a second which can mean the trees can travel in different directions. Then the third substance, whether air or water or oil or nitrogen, is subjected to the higher voltage and can experience a breakdown where electrons are ripped away from the substance's valence bands. Once those electrons are ripped away in the direction of the electric field towards positive and away from negative, the leftover ion appears positive, thereby extending the field inside the deformity and concentrating the field more. As the electric field travels along the positive ions, more of the substance has electrons ripped away, and you have a fractal breakdown pattern like the tree shown in this video. At least that's my understanding of how it can happen.
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