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ASSESSMENT OF THERMAL PARAMETERS FROM THE MANUFACTURING PROCESS OF METAL OXIDE VARISTORS
Abstract
Nowadays, protection of any sensitive electric equipment against any type of overvoltage (including lightning applied on power networks) is a big challenge for the power electronics domain. The most advanced and reliable devices used in order to perform this operation are metal oxide varistor based surge-arresters. These polycrystalline ceramic varistors are made of a mixture of different metal oxides, where the main ingredient (more than 80-90% as mass concentration) is the ZnO. The real improvements of these devices could be performed only in reference with their manufacturing process, by introducing different additives, with particular influences on the electrical behavior of the semi-conductor material, especially on their non-linear relation between voltage applied and current response and on their heat absorption capability. There is no physical or analytical model in order to assess the influence of dopants (additives) on the main electrical characteristics. This is an empirical process which will lead to the development of new semiconductor materials. This article will explain the influence of the sintering temperature on the electrical properties of two varsitor materials, with different additives
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