140 



Electric Transformers. 



Ho. .-.1)628 



Transformers for connecting up to Three Phase and Two Phase 



Alternating Current Networks. 



Three Phase-Direct Current Transformers for constant pressure, Figure, for connect ing up to 3- 

 phase Current of 100 500 volts and 50 cycles per second: consisting of a Three Phase Motor with 

 Short Circuit Kotor*) (for starting with a star-delta switch), coupled to a Direct Current Compound 

 Dynamo for 65 volts, with compound winding which can be cut out; the two mounted on one 

 base plate. 



The number of revolutions per minute at no-load is 1500; when loaded the speed falls to the value given in 

 the table. For starting, it is advisable to employ a star-delta switch, and for regulating the voltage a shunt regu- 

 lator is necessary. 



When ordering, please give the network voltage and the frequency of the 3 -phase supply. 



The preceding, Three Phase Motor with Slip Ring Rotor. 



A Starting Rheostat is necessary for starting the transformer, and a Shunt Regulator for regulating 

 the voltage. 



Two phase Alternating Current Motors of equal capacity are supplied instead of the 3-phase motors at the 

 same prices. 



*) In places where it is forbidden to connect up motors having squirrel-cage rotors and of the HP. efficiencies up to 

 those mentioned in the table, the transformers listed further on should be selected, the 3-phase motors of which have 

 rotors with slip rings. 



