332 



ELEMENTS OF ELECTRICAL ENGINEERING. 



accumulation of high voltage at starting, as explained on page 272. 

 The essential connections of two three-phase rotary converters 

 to the alternating-current supply and to the direct-current bus- 

 bars are shown in Fig. 283, and one mode of connecting a six- 

 phase converter through its step-down transformers to the alter- 



I High Tens / on Bus -bars 



I I I 



T I 



Dtrect Current 



Fig. 283. 



nating-current supply is shown in Fig. 284.* Figure 285 is a 

 complete diagram of connections of a three-phase rotary converter 

 arranged to deliver direct current to a street railway. No choke 

 coils are shown in connection with the lightning arresters in Fig. 

 285. In fact, however, a choke coil is inserted in each of the 



* See page 230. 



