164 



THE TRANSFORMER. 



F D gives the voltage overcoming reactance due to leakage. 



In any loaded transformer, the secondary voltage will be 



diminished by the impedance voltage and will be the resul- 



primary voltage 

 tant of the ratio of transformation and of the impedance 



voltage. Consequently, in a transformer working on non- 

 inductive load, we shall have the conditions represented 



FIG. 76. SECONDARY VOLTAGES. NON-INDUCTIVE 

 LOAD. 



O F 



FIG. 77. SECONDARY VOLTAGES. INDUCTIVE 



ILOAD. 



f 



FIG. 78. SECONDARY VOLTAGES. VARIOUS POWER FACI 



SCALE Of VOLTS 



10 20 30 40 50 

 SCALE Or AMPERES 



1 I I I l I l l l l I l 1 I I I I I I I I 

 <J 5 10 15 !?0 



in Fig. 76, where D represents the total induced secondary 

 voltage, and E is the terminal voltage, the line D E repre- 

 senting the impedance voltage determined by experiment 

 as stated above. D F is the idle voltage introduced owing 

 to the magnetic leakage of the transformer. 



The drop in the transformer under these conditions is the 

 difference between the length of D, the no-load secondary 

 voltage, and E. 



