. Development and electrical distribution of water power . Fig. 61. POLE LINE AND ACCESSORIES I29 as directed in the previous chapter, in order to balance staticand inductive effects. Fig. 63 shows the general layout of a two-circuit, three-phaseline for 80,000 volts, the wires being placed in a right triangularrelation, so that the inductive effects are approximately balanced. HOR. SECTION A-BHOR. SECTION C-D. END ELEVATION 1 1 side elevation hor. section g-h,Fig. 62. The advantages over the ordinary pin-and-insulator construc-tion claimed for this system of supporting wires are: (a) With the
. Development and electrical distribution of water power . Fig. 61. POLE LINE AND ACCESSORIES I29 as directed in the previous chapter, in order to balance staticand inductive effects. Fig. 63 shows the general layout of a two-circuit, three-phaseline for 80,000 volts, the wires being placed in a right triangularrelation, so that the inductive effects are approximately balanced. HOR. SECTION A-BHOR. SECTION C-D. END ELEVATION 1 1 side elevation hor. section g-h,Fig. 62. The advantages over the ordinary pin-and-insulator construc-tion claimed for this system of supporting wires are: (a) With the standard type of pin insulator now used, thedifficulties of construction increase very rapidly at the highervoltages. The cost of insulator for a given margin of safety in-creases for voltages above 60,000 nearly as the cube of the increasein voltage. Either very large petticoat diameters must be usedor very high insulators with many petticoats. In either case the9 I30 DEVELOPMENT AND DISTRIBUTION OF WATER POWER manufacture of the porcelain parts is a difficult and expensivematter; and with the long pin necessary, the mechanical stressesfrom the line on insulator, pin, and cross-arm are the series unit system here proposed, the cost of insulators HOR. SECTION A-B-10-9. f- / 0 / . HOR. SECTION C-DLightning Arrester Wire Transmission. Wire L
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