Application of Non-Linear Resistors to Inductive Switching

Many materials possess potentially important properties for application in high power electrical apparatus. These properties ban be controlled to behave either as dielectrics rics or as conductors. Such materials have been used for switching applications, often for protection against - abnormal operation. The need for reliable and reusable opening switches in very high power pulse generation has led to examination of these materials, both in terms of their insulating properties, their conducting properties, as well as in terms of their transition characteristics. Using existing data on the properties of materials with a strong non-linear dependence of the resistivity on external influences, such as heating, magnetic fields, or pressure, a number of commercially available materials were characterized for pulse power uses. For example, insulating pronerties, such as maxinum electric field strength and residual conduction, were obtained under more stressful conditions than those associated with their present applications. In addition, samples were evaluated for maximum rate of resistivity transition, so as to provide data for better understanding of these materials and also to evaluate the design options offered for developing compact high-power pulse generators.