CRJ Electrical Presentation

8/2/2019 CRJ Electrical Presentation

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Electrical System:

Bombardier Canadair

Regional Jet 200Lani TokunagaAS 356


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Purpose

To teach the class about the electricalsystem in the CRJ-200


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Outline

What is electricity and why is it important?Types of electrical current usedGenerator

BatteryADG and IDGGenerator Priority SystemCircuit breakersLoad distributionControls and indicatorsSummary

Conclusion


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What is electricity and why is itimportant?Electricity electric current used or

regarded as a source of powerPowers our aircraft !

Instruments Lights

Communication radios

Flaps

Temperature control


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Types of Electrical CurrentUsed

Both AC andDC

AC

Alternating current The direction of thecurrent flowing isconstantly changing

Powers: AC bus 1 and 2 AC essential bus

AC utility bus 1 and

2 AC service bus

DC

Direct current Electrical flow is onlyin one direction

Powers:

DC bus 1 and 2 DC essential bus

DC battery bus

DC utility bus 1 and

2 DC service bus


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Generator

A machine that converts mechanicalenergy into electric energy2 engine-driven 115-volt/200-volt, 400 Hz,

3-phase, 30 kVA AC power generatorsOne APU generator


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Battery

17-ampere hour24-volt main batteryPowers:

Back up powerBattery Busses

Left and right battery bus

Main battery direct bus

APU battery direct busAPU battery

43-ampere hour 24-volt


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Air Driven Generator (ADG)

Can be deployed in flightSupplies 115-volt, 400 Hz, 3 phase AC

power at 15 kVA

Emergency usePowers:

AC power to the AC essentialbus

Emergency electrical DC

power available on busses


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IDG

Stands for integrated drive generatorsConverts engine shaft speeds of 9,840 to

17,500 RPM to a constant speed of 12,000

RPMUses constant speed drive to

hydromechanically govern the speed of thegenerator


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Generator Priority System

IDG 1 APU Generator IDG 2

Failed Not available Both AC Bus 1 & 2

Failed AC Bus 1 AC Bus 2

Both AC Bus 1 &

2

Not available Failed

AC Bus 1 AC Bus 2 Failed

Failed Both AC Bus 1 &2

Failed


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Circuit Breakers

Defined as a device designed to open andclose a circuit by nonautomatic means andto open the circuit automatically on a

predetermined over current withoutdamage to itself when properly appliedwithin its ratingContribute to electrical safety8 circuit breaker panels


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Load Distribution

AC Loads Distribution Supplies power to circuits necessary for ground-servicing operations

Power supplied from external power receptacleor APU generator

Battery Bus Loads Distribution Powers engine ignition system, APU battery

contactor, ADG, main battery contactor, etc.DC Loads Distribution

Provides power to most aircraft components


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Controls and Indicators

Electrical PowerServices PanelGenerator switches

Off/reset buttonsFail/off buttonBus tie

switch/lightsAPU generator

switchDC service switch

Avail/in use


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Controls and Indicators, contd.

EICAS SecondaryDisplayGenerator output

flow linesIDG Disconnect

Status MessageGenerator load

readoutGenerator voltage

readout

Generator


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Summary

What is electricity and why is it important?Types of electrical current usedGenerator

BatteryADG and IDGGenerator Priority SystemCircuit breakersLoad distributionControls and indicators


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Conclusion

Electricity is very important!Powers most components in the aircraft


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Works Cited

(2007). CRJStudyGuide.com. RetrievedFebruary 10, 2009, from CRJ 200 ElectricalSystem Questions Web site:

http://www.crjstudyguide.com/crj_200/electrical.htmAlternating Current. Retrieved February

10, 2009, from NDT Resource Center Web

site: http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/alternatingcurrent.htmAtlantic Coast Airlines, (1997). Flight Crew

Operating Manual CRJ-200. Dulles, VA:


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CRJ Electrical Presentation