44 CONSTANT-VOLTAGE TRANSMISSION 



line costs were not mentioned in the paper, but a clear 

 case was made for the improvement in operation. 



In an article in June, 1913, in The General Electric 

 Review , on "The Operation of High- Voltage Power 

 Systems," by H. H. Dewey, a description was given of 

 the system of the Utah Power and Light Company, then 

 under construction. The length is 140 miles; total power 

 capacity, 42,000 Kw.; voltage, 130,000; and frequency 

 60 cycles. Two 7,500 Kva. synchronous phase modi- 

 fiers were to be installed at the receiver station and to be 

 controlled by automatic voltage regulators. They are 

 of sufficient size to hold the voltage constant for loads 

 from 5,000 Kw. to 38,000 Kw., but for larger or smaller 

 loads than these limits the voltage must be varied. 

 This line, like the Big Creek line, is an example of a 

 case where absolute dependence is placed on the syn- 

 chronous phase modifiers in order to deliver, for com- 

 mercial use, the load planned for the line. In other 

 words, the principles of constant-voltage transmission 

 saved, in this case, the building of a duplicate i4o-mile 

 transmission line. It is typical of the way in which the 

 principles of this new method of constant-voltage oper- 

 ation are misunderstood that the above article describ- 

 ing the Utah Power and Light Company stated, "The 

 use of this synchronous condenser does not allow any 

 saving in copper in such a line," while, as a matter of 

 fact, the synchronous condensers had saved an amount 

 of copper equal to the entire weight of copper used in the 

 high-tension system. 



In November, 1913, the longest straightaway trans- 

 mission line in the world was put in operation, its length 

 being 241 miles, from Big Creek to Los Angeles. In 



