90 



CONSTANT-VOLTAGE TRANSMISSION 



CONSTANT- VOLTAGE LINES, SYNCHRONOUS PHASE MODIFIERS USED 



Although without any reference to the subject- 

 matter of this chapter, the following approximate first 

 costs of the above lines have been inserted, as they form 

 an addition to the cost comparisons of Chapter X. 



Cost of two varying- voltage 2OO-mile lines: 



Copper cables, at 18 cts. per Ib 



Towers, insulators, ground cables, and erection. 



Cost of one constant- voltage 2OO-mile line: 



Copper cables, at 18 cts. per Ib 



Towers, insulators, ground cables, and erection 



Synchronous phase modifiers, and ensuing expenses, at 



$10 per Kva 



Extra losses, at $100 per Kw 



Saving due to the constant-voltage method, omitting 

 cost of land . . 



$856,000 

 896,000 



$1,752,000 



$428,000 

 448,000 



139,000 

 272,000 



$1,287,000 

 $465,000 



