DC POWER SYSTEM

1. AIRCRAFT ELECTRICALAIRCRAFT ELECTRICAL
SYSTEMSSYSTEMS

2. CN-235 CASA ELECTRICALCN-235 CASA ELECTRICAL
SYSTEMSYSTEM
Table of ContentsTable of Contents
 Electrical SystemElectrical System
 Direct Current GenerationDirect Current Generation
 Control and IndicatorsControl and Indicators
 What we learned?What we learned?
 Question?Question?

3. Electrical SystemElectrical System
The electrical power supply by the direct current twoThe electrical power supply by the direct current two
Batteries , Ground Power Unit (GPU) two StarterBatteries , Ground Power Unit (GPU) two Starter
Generators and Transformer / RectifierGenerators and Transformer / Rectifier

4. Direct Current GenerationDirect Current Generation
BATTERYBATTERY
Two nickel-cadmium batteries, of 24 Volts and 40Two nickel-cadmium batteries, of 24 Volts and 40
Ampere-hours each supply, the energy for the systemsAmpere-hours each supply, the energy for the systems
and that necessary to start the enginesand that necessary to start the engines

5. Nickel-cadmium batteryNickel-cadmium battery
Cell
Terminals
Container
Main
connector
Vent
pipe
Temperature Sensor
Cell

6. Direct Current GenerationDirect Current Generation
EXTERNAL POWER SOURCEEXTERNAL POWER SOURCE
On the graund, all the systems can be supplied withOn the graund, all the systems can be supplied with
electrical power from an external direct current sourceelectrical power from an external direct current source
connected to the aircraftconnected to the aircraft

7. Direct Current GenerationDirect Current Generation
STARTER GENERATORSTARTER GENERATOR
Each generator supplies 28 Volts 400 Amperes ofEach generator supplies 28 Volts 400 Amperes of
continuous outputcontinuous output

8. Direct Current GenerationDirect Current Generation
TRANSFORMER-RECTIFIERTRANSFORMER-RECTIFIER
Conversion from 115vac to 28 vdcConversion from 115vac to 28 vdc

9. Control and IndicatorControl and Indicator

10. ??What we learnedWhat we learned
 We have two nickel-cadmium batteries.We have two nickel-cadmium batteries.
(24vdc 40Amper)(24vdc 40Amper)
 We have two starter generators.We have two starter generators.
(28vdc 400amper)(28vdc 400amper)
 We have GPU.(28vdc 600Amper)We have GPU.(28vdc 600Amper)
 We have one TR.(28vdc)We have one TR.(28vdc)