Alternating-Direct Current Transformers. 



143 



Alternating-Direct Current Transformers for a high degree of Voltage-regulation (Figure on p. 139) 

 for connecting up to 100 500 volts Alternating Current at 50 cycles per second: comprising 

 an Alternating Current Motor with Squirrel-cage Eotor*) coupled to a Direct Current Shunt 

 wound Dynamo for 5 65 volts pressure without change in speed or armature current; on one 



l>a<e plate. 



9 



s 



i 



S 

 s 



List Number .... 

 Efficiency, HP. 



Motor 



R. P. M. 



50656 

 0.5 

 1410 



50657 

 1 



1420 



50658 



2 

 1425 



50659 



3 

 1435 



50660 

 4 



1440 



50661 



6 

 1450 



Shunt Wound 

 Dynamo 



Output, watts 

 Constant 



at 65 volts, 



175 



2.7 



485 



7.5 



1000 

 15.4 



1620 



25 



2400 



37 



3600 



56 



Prices of Transformers / a) 120 volts 



for | b) 220 volts 



Network Voltages to ' c) 500 volts 



d) Extra for 4 Slip Rings 



e) Packing for Land Transport 



20.10.0 28.15.0 38. 0.0 46. 5.0 52.10.0 62.15.0 



20.10.0 28.15.0 38. 0.0 46. 5.0 52.10.0 62.15.0 



30. 0. 39. 5. 48. 0. 54. 5. 65. 0. 



1.16.0 2.10.0 3.16.0 4.12.0 5. 5.0 6. 0.0 



0.11.0 0.15.0 1. 0.0 1. 4.0 1. 8.0 1.12.0 



Prices of I ^ Phase Rheostat and Re versing Switch 2. 2.0 2. 2.0 2. 8.0 3. 0.0 3.12.0 5.10.0 

 A i g) Shunt Regulator for Fine Regu- 

 lation 9. 10. 9. 10. 9. 10. 10. 15. 10. 15. 12. 0. 



Weight of Transformer with 

 Coupling and Base-plate 



nett , 



gross 



about kg 

 about kg 



125 

 190 



165 



240 



230 

 320 



315 

 420 



340 

 460 



420 

 550 



The speed at no-load is 1500 r. p. m., which drops to the values given in the table when the load is taken up. 

 A Phase Rheostat with switch is necessary for starting, and a Shunt Regulator for regulating the D. C. 

 voltage. 



When ordering, kindly state the network voltage and frequency of the A. C. The transformers can also be sup- 

 plied for 40 60 periods at the same prices. The efficiencies and speeds vary with the change in frequency. If the 

 network voltage is higher than given under a and b in the table, the price for the next higher stage then holds. 

 Please communicate with us if the voltage is above 500. 



The preceding. Alternating Current Motor with Slip Ring Rotor. 



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

 the voltage. 



Alternating-Alternating Current Transformers. 

 Three Phase-Three Phase Transformers. 



For transforming 3-phase and alternating current voltages, recourse should be had to the Static Transformers, 

 catalogued in the List of Physical Apparatus, Section: Galvanic Electricity. This list containing the usual 

 types of transformer for demonstration purposes, also folding models and those for taking off voltages of various 

 grades by varying the transformation ratio. Prices for larger transformers on application. 



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



