Showing papers by "John C. Fothergill published in 1983"
TL;DR: A wide range of experimental data from several sources, and covering most of the factors known to influence water tree growth, has been collated and assessed in terms of the independent growth parameters as discussed by the authors.
Abstract: A wide range of experimental data from several sources, and covering most of the factors known to influence water tree growth, has been collated and assessed in terms of the independent growth parameters. Systematic trends have been identified wherever possible, allowing a critical evaluation of the postulated treeing mechanisms. On the basis of these data a general framework of tree growth has been deduced in terms of a composite process comprised of three phases: inception, rapid growth, and fluctuation-controlled growth. It is concluded that no postulated microscopic mechanism is adequate to describe the inception phase, although one or two may be applicable to the rapid growth phase after substantial modification. It is suggested that growth can best be regarded as a local fatigue mechanism requiring a minimum electric field strength to be operative. A microscopic picture of water tree growth is tentatively proposed embodying all the known properties of water trees. Suggestions are also made concerning the minimization of water treeing and the most important directions for future research.
44 citations
04 Jul 1983
TL;DR: Growth rate data itself provides a frame work of observations which must be obeyed by any viable microscopic model of tree growth as discussed by the authors, however, it is insufficiently discriminating and must be supplemented by alternative microscopic investigations, particularly in the inception phase.
Abstract: Growth rate data itself provides a frame work of observations which must be obeyed by any viable microscopic model of tree growth. It is however insufficiently discriminating and must be supplemented by alternative microscopic investigations, particularly in the inception phase.
5 citations
04 Jul 1983
TL;DR: In this article, it was shown that a complete equivalence exists between static and dynamic methods of breakdown testing, and some preliminary experimental results lend support to the Hill and Dissado theory of a fluctuation controlled breakdown mechanism.
Abstract: It is shown that a complete equivalence exists between static and dynamic methods of breakdown testing. Some preliminary experimental results lend support to the Hill and Dissado theory of a fluctuation controlled breakdown mechanism.
3 citations