Synopsis.-This is the third report to be presented before the caused by longitudinal and tangential stresses. Hence, it may be Institute of the research investigation of ionization phenomena in assumed when the ionization-power curve is concaved upwards, that paper-insulated, high-voltage cables, which is being conducted at the longitudinal and tangential stresses exist within the cable. This Harvard Engineering School under the auspices of the Impregnated theory is substantiated by investigations with cable models.Paper-Insulated Cable Research Committee. This paper is aThe value of the maximum power factor and of the voltage at which report of progress and will be followed by further reports as the work it occurs are shown to be very simple functions of the three characteriscontinues.tic cable constants. With a considerable number of cables,the The total power dissipated in impregnated-paper insulation may calculated and the experimental values of these quantities are in he separated by the graphical method into the component dissipated close agreement. in the solid dielectric and that dissipated in the ionized gas films,The fact that the maximum power factor is independent of gas and also may be separated analytically into these two components by pressure, determined experimentally by E. S. Lee, is verified selecting three suitable points on the power curve. This separation both experimentally and analytically. It is also shown that the gengives the three characteristic cable constants.
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