10 



1. Mooring line 



2. Hawsepipe 



3. Steel rope 



4. Exhaust 



5. Air intake 



6. Power plant 



7. Inner hull 



8. Outer hull 



9. Power cable 



10. Swivel connector 



Figure A-12. Cross section of surface power plant hull. 



The generator is rated for 50-kw continuous or 60-kw intermittent, 

 60-Hertz, 480-volt, 3-phase, AC power output. Voltage regulation was 

 established at 1% bandwidth of steady-state voltage, with a maximum 

 steady-state frequency variation of 0.5%. The no-load to full-load recovery 

 time was set at 4 seconds with an isochronous governor. The same generator 

 plant is used for the 600-foot-deep and the 6,000-foot-deep transmission 

 systems. Table A-3 lists the characteristics of the diesel generator. 



The electrical systems selected for the surf ace- tendered power system 

 were 480 volts, 3 phase, 60 Hertz for 600-foot depths and 4, 1 60 volts, 

 3 phase, 60 Hertz for 6,000-foot depths. The 480-volt generator plant out- 

 put will be transmitted directly to the load module. The 4,160-volt system 

 will generate power at 480 volts, which will be stepped-up to 4,160 volts 

 with a dry transformer; the power will then be transmitted to the load 

 module at 4,160 volts. 



Both the 480-volt and 4,160-volt systems will utilize the same type 

 of cable, with the insulation level at 5,000 volts. The conductor size selected 

 for both systems is 6 AWG. The 480-volt system at 600 feet will require 

 915 feet of cable, and the 4,160-volt system at 6,000 feet will require 

 1 1 ,790 feet of cable. These cable lengths would limit the voltage drop to 

 within 5%. 



108 



