Mechanism for transition from branch to bush electrical tree

A mechanism is proposed for the transition from branch to bush-type electrical tree growth electric fields above a critical Laplacian field, a hypothesis which Dissado (1994) has shown can explain a wide range of observed treeing-related phenomena. The reduction in tree growth results from a combination of the high limiting electric field at high frequencies, high electric field, high space charge density, and the electro-mechanical and electro-thermal phenomena which result therefrom.