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admittances ances applied assumed balanced base calculated capacitive Chapter components of current conductors connected corresponding currents and voltages currents flowing determined diagram direction earth effect equal equations equivalent circuit expressed fault feet Figure frequency give given ground wires indicated induced internal line currents line-to-ground fault line-to-line voltage load loop machine magnitude mean method mutual impedances negative negative-sequence neglected neutral neutral conductor obtained ohms per mile operating parallel phase phase voltages positive positive-sequence Problem rated ratio reactance reference replaced represented resistance respectively resulting self-impedance sequence networks short shown in Fig side single-phase solution spacing Substituting symmetrical components Table terminals three-phase three-phase circuit transformer bank transmission circuits transmission line two-phase ungrounded unit unsymmetrical values vectors voltage drop windings Y-connected zero zero-potential bus zero-sequence zero-sequence currents zero-sequence impedances zero-sequence network
Page 54 - a system of n vectors or quantities may be resolved, when n is prime, into n different symmetrical groups or systems, one of which consists of n equal vectors and the remaining (n - 1) systems consist of n equi-spaced vectors which with the first mentioned group of equal vectors forms an equal number of symmetrical n-phase systems...".
Page 12 - EMF) and the currents are constantly changing from maximum positive to maximum negative, but the specified or effective value is equal to the square root of the average value of the square of the instantaneous values, which, for a true sine wave, is equal to the maximum value divided by \/ 2.
Page 19 - The numerical per unit value of any quantity is its ratio to a chosen base quantity of the same dimension. Thus a per unit quantity is a normalized quantity with respect to the chosen base value.
Page 193 - ... therefore, we exchange the imaginary and real components, changing the sign of the latter in so doing. We then proceed as though the angle were hyperbolic. The model permits of the projection of cos (=*= 0i =*= t0j) between the limits of + <» and — oo in 0!, and the limits of +1.4 and — 1.4 in 02. 4 Chart Atlas of Complex Hyperbolic and Circular Functions, by AE Kennelly, Harvard University Press, 1914.
Page 193 - ... foot of the projection from the hyperbola. This effects a geometrical process which is easily apprehended and 1 " Two Elementary Constructions in Hyperbolic Trigonometry," by AE Kennelly, Am. Annals of Mathematics, Salem Press, 2d Series. Vol. V, No. 4, pp. 181-184, July, 1904, mainly reproduced in " Tables of Complex Hyperbolic and Circular Functions," by AE Kennelly, Harvard University Press, 1914, Figs. 19-22, pp. 165-168. 2 " Artificial Electric Lines," by AE Kennelly, McGraw-Hill Book Co.,...
Page 65 - Well, a dot product is defined in the geometrical sense as the product of the magnitude of two vectors multiplied by the cosine of the angle between them.
Page 169 - Five Place Table of Natural Trigonometric Functions to Hundredths of a Degree.