No. 50647 



Three Phase-Direct Current Transformers. 



141 



Three Phase-Direct Current Transformers, for high Voltage-regulation, for connecting up to 100 to 

 500 volts Three Phase Currents at 50 cycles per second: comprising Three Phase Motor having 

 Squirrel-cage Eotor*) (for starting by means of a star-delta switch), coupled to a Direct Current 

 Shunt Dynamo for 5 65 volts pressure without change of speed or armature current; the two 

 mounted on one base plate. 



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The speed at no-load is 1500 r. p. m., and this falls to the value shown in the table when taking up the load. 

 For starting, the use of a star-delta switch is recommended, and for regulating the voltage a Shunt Regulator is 

 essential. 



When ordering, please state the network voltage and the frequency of the A. C. The transformers can also 

 be supplied for 40 60 cycles without change in price. The efficiencies and speeds vary with the change in fre- 

 quency. If the network voltage is higher than is given under a and b in the table, the price of the next higher stage 

 is charged. Kindly communicate with us if the voltage is above 500. 



The preceding, Three Phase Motor with Slip Ring Rotor. 



A starting switch is necessary for starting the transformer and a Shunt Regulator for regulating the 

 voltage. 



Two phase Alternating Current Motors of the same efficiencies are supplied in place of the three phase motors 

 at the same prices. 



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

 to those mentioned in the table, a transformer should be selected from those listed further on, the 3-phase motors 

 of which have rotors with slip rings. 



