Vector Permeability

The principal magnetic properties of transformer core materials are generally expressed in terms of permeability and power loss per kilogramme. Another method, described in this paper, is to assign a complex value to the permeability (Sections 2 to 4). For many purposes this method possesses advantages; for example, very simple relations can be found (Sections 5 to 7) connecting the electrical characteristics of coils with the components of the vector permeability of their cores. Data for samples of nickel-iron and silicon-steel are given (Section 8) and, by way of an example of the use of the system, a simple method of securing the optimum design for a low-loss reactor is worked out (Section 9).