Electrical news and engineering . eddy currents, and hysteresis losses, which exist onthe circuit but which caiimii In- calculated. This value for TII K ELECTRICAL NEWS 61 H approximately very closely to the values calculated fur thelimiting distance of sjieech for metallic circuits of variousKauges. lrom equation (1) or (2) for li, the required value olH being known, L can be calculated. Phc values of L. C, and R (resistance of mile of cir-cuit plus apparent resistance of coils per mile) being nowknown, a can be calculated, using equation (1) for cableand equation (2) for aerial wires. Irom t
Electrical news and engineering . eddy currents, and hysteresis losses, which exist onthe circuit but which caiimii In- calculated. This value for TII K ELECTRICAL NEWS 61 H approximately very closely to the values calculated fur thelimiting distance of sjieech for metallic circuits of variousKauges. lrom equation (1) or (2) for li, the required value olH being known, L can be calculated. Phc values of L. C, and R (resistance of mile of cir-cuit plus apparent resistance of coils per mile) being nowknown, a can be calculated, using equation (1) for cableand equation (2) for aerial wires. Irom this we get thewave length and the between coiK 1 eipials l/lO ofthe wave length. The required inductance per loop mile being L. theinductance of each coil should be L/2 x 1, If there are nocoils having this inductance the coil with the next lowestinductance should be used, anad the distance 1 reduced soas to get the re<|uired added inductance per wave lliis information before him the engineer will In- in. ^m k uive 4a position to determine whether more economical resultswill be obtained by loading an existing circuit or installinga circuit of somewhat heavier gauge. It is of considerableimportance that the insulation resistance of a loaded lineshould be kept good as the velocity being reduced the at-tenuation of the current due to leakage conductance will beconsiderably increased. Curve 1 shows the different practical (B equals ,/d)and theoretical (B equals ) calculated values for Bas the ultimate distance of speech increases from 500 miles. This curve is applicable to all aerial circuits. Curve 2 shows the amount of inductance required togive any definite value of B. This curve is plotted for an8 B. W. G. circuit strung 12 inches apart. The critical pointof this curve is reached when henrys has been a<Idedper loop mile, and although theoretically henrys shouldbe added to get a resonant circuit at SOO cycles per secon
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidelectricalnewsen20donm
