EQUIVALENT LOAD TESTS 49 



run, the excitation given the machine is a certain per- 

 centage over that which will give the desired voltage 

 at the desired power-factor and load. This excitation 

 is determined from saturation and synchronous im- 

 pedance curves. Short circuit runs are made with a 

 certain percentage of excitation over that required 

 to give the desired kilo volt-ampere reading. 



Circulating open delta runs are made as previously 

 described, an allowance being made for the proper 

 excitation and armature current at the power-factor 

 desired. 



