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The degraded region is formed even at low voltage almost equal to electroluminescence (EL) starting voltage, and then tree channel grows from the degraded region. This paper reports the relation between the progress of polymer degradation and EL intensity, and discusses the process at the very early stage of tree initiation including the formation of tree channel without gas discharge.
Electroluminescence (EL) occurs in initiation phase of electrical tree and is considered to be a probe of the degradation of polymer insulating materials. We consider that EL is caused by electron impact; namely, electrons injected from electrode are accelerated in micro cavity of sub-micron size and causes bond scission and excitation of luminescence center. Under existence of water, water treeing...
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