EFFECT OF CHARGING CURRENT 



89 



more than the regulation from full load to no load, it 

 does not seem necessary to add the generator regulation 

 with unchanged field current to the regulation of the 

 line and transformers, in order to obtain the maximum 

 voltage variation for successful practical operation. 



EFFECT OF CHARGING CURRENT IN A 2oo-MiLE LINE 



Conductors, copper cable, 250,000 circular mils. 



Spacing of conductors, 10 feet, flat spacing. 



Effective spacing 3 Vio X 10 X 20 = 12.6 feet. 



Frequency, 60 cycles. 



Resistance of line per conductor, 45.7 ohms. 



Reactance of line per conductor, 160 ohms. 



Capacity susceptance of line per conductor, 0.00107 ohms. 



Resistance of transformers and protective coils at each end, referred 



to high tension, 4.1 ohms. 

 Reactance of transformers and protective coils at each end, referred 



to high tension, 64.5 ohms. 

 Maximum working voltage, 115,000 volts. 

 Power-factor of load, lagging, 85%. 



VARYING- VOLTAGE LINES, No SYNCHRONOUS PHASE MODIFIERS USED 



Line 200 Miles in 

 Length, with Trans- 



formers and Pro- 



tective Coils at Each 



End. 



Short Line of Same 



Electrical Character- 



istics, but Without 



Capacity. 



Voltage variation at generator 



em 



Steady voltage at receiver end . 



Kilowatts delivered. . .^ 



Efficiency of transmission at 

 full load 



Power-factor at generators, 

 lagging 



Generator Kva. at no load with 

 normal voltage at receiver. . 



Approximate voltage at re- 

 ceiver end when the receiver 

 circuit-breakers open, enough 

 generators being connected 

 to carry the charging current. 



92,000 to 115,000 



108,000 

 10,100 Kw. 



89% 

 10,400 Kva. 



200,000 volts 



92, ooo to 1 1 5, ooo 



92,000 

 8,200 Kw. 



93% 



155,000 volts 



