HEATING OF SINGLE-PHASE CONVERTER 243 



P, the continuous-current component of the current in the coil at 

 P undergoes a sudden reversal. Hence we divide the entire cycle of 

 current changes at P during half a period into two stages : (1) while 



< (f>, and the continuous current is flowing through P in a counter- 

 clockwise direction, as shown in Fig. 150 ; and (2) while 6 > <j>, and 

 the continuous current is flowing past P in a clockwise direction, 

 as shown in Fig. 151. 



