ELECTRO FORMED CONDUCTOR FOR TELEPHONE DROP WIRE 1119 



ducts. These are terminated in two 1500-kva metal-clad substations 

 which consist of high-voltage switching units, transforming units, and 

 low-voltage feeder units. Each unit substation has the self -cooled rating 

 given in Table I. 



On the incoming line side of each substation are two load interrupter 

 disconnecting switches so that the building may be supplied by either 

 of the two incoming high- voltage cables. The high- voltage switches feed 

 the power into the two transformers, each of which is rated at 1500 kva, 

 three-phase, 60-cycles, 55°C rise, and is self-cooled, filled with non-in- 

 flammable liquid. For a short time interval, with proper switching, either 

 of these transformers can supply the total building load if fan cooling is 

 provided. 



The 480-volt power from each transformer is then fed into its respec- 

 tive low-voltage switchgear for distribution to various parts of the build- 



Table I 



ing. Lighting, heating and ventilation services are provided totally from 

 one substation by way of a disconnecting bus tie switch which automatic- 

 ally throws over to the other substation in case of failure of one. 



Other than the lighting, heating, ventilation and some plant services, 

 each substation is designed to supply power for the operation of one 

 machine. 



From each substation one low-voltage ac feeder supplies on its machine 

 a number of rectifiers which transform and rectify the 480-volt, three- 

 phase, ac power to dc power at a low voltage. From this feeder is supplied 

 all of the "auxiliary" plating power for that machine: alkali cleaner, 

 acid pickle, cyanide copper flash and plate, electrocleaner, lead plate and 

 brass plate. In addition the dc power for establishing the field in the mag- 

 netic capstan is supplied from a rectifier on this feeder at 55 volts. 



Another low-voltage ac feeder from each substation feeds through an 

 induction voltage regulator which in turn feeds sixteen rectifiers of one 

 machine. From these rectifiers is taken the dc plating power for the acid 

 copper plate section of the machine. The function of the induction voltage 



