Electric Power Transmission a Practical Treatise for Practical Men
Electric Power Transmission a Practical Treatise for Practical Men
Louis Bell
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Its total magnitude depends on the rate of variation of the current and the ability of this current to set up stresses which can affect neighboring conductors as in Fig. 43. This latter property depends on the number of turns, their locality with reference to each other, and other similar conditions which depend simply on the physical nature of the circuit and so for any given circuit are settled once for all. These properties are defined on the basis of their net effect, and the ratio of the r...ate of variation of the current to the inductive E. M. F. Pro- duced by it in a given circuit is usually known as Z, the ''coefficient of self induction" of that circuit. The total inductive E. M. F. Is then equal to Z, multiplied by the actual rate of current variation expressed in such units as will fit the general system by which E, R and other quantities are con- cordantly measured. Expressed in this way the rate of current variation in an alternating circuit is 2 7t n, where n is the number of cycles per second, and n has its ordinary meaning of 3.
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