Design of standards of inductance, and the proposed use of model reactors in the design of air-core iron-core reactors

Abstract

After a brief discussion of the various uses of reactors and the general charac- teristics of formulas for the self-inductance of coils, a number of useful general relations concerning the self and mutual inductance of geometrically similar coils are given with illustrative derivations of some of these relations. Three applications of some of these relations are developed in the remainder of the paper. The first is a simple and straightforward procedure for the design of air-core coils to serve as standards of self-inductance and is believed to be the first such design procedure for this specific purpose to be published. The second application pro- poses that the self and mutual inductance of the large current-limiting reactors used in power systems may be advantageously predetermined, or their computed values checked, by laboratory tests made on small-scale models. The third application proposes to use models for the checking or predetermination of the properties of iron-core air-gap reactors.