ELECTRICAL SYSTEM Flashcards
(27 cards)
ELECTRICAL SYSTEM
28- VOLT DC, SPLIT BUS SYSTEM WITH A NEGATIVE GROUND
ELECTRICAL POWER IS SUPPLIED BY
(2) 30- VOLT, 250 AMP DC STARTER GENERATORS
1 BATTERY 24V, 42 AMPS HR
BACK UP SOURCE POWER
24- VOLT BATTERY
WHAT INTERCONNECTS GENERATOR BUSES?
(2) 325- AMP CURRENT LIMITERS
THE ENTIRE BUS SYSTEM OPERATES AS A …
SINGLE BUS, WITH POWER PROVIDED BY THE BATTERY AND THE GENERATORS.
EACH SUBPANEL FEEDER SUPLIES TWO DUAL BUSES TRHOUGH…
50 AMP CIRCUIT BREAKERS AND ISOLATION DIODES
WHAT SOURCES SUPPLY THE ESSENTIAL COMPONENTS?
HOT BUS (BATTERY) AND SUBPANEL FEEDER.
WHAT WILL PROVIDE ONE INVERTER?
400- HERTZ, 115 VAC TO THE AVIONICS/ 400- HZ, 26 VAC TO THE TORQUEMETERS
CAPABILITY OF THE BATTERY, GOOD CONDITION
STARTING BOTH ENGINES, BACKUP POWER 30 MINUTES
HOW LONG DOES THE BATTERY NEED A CHECK?
18 MONTHS
WHAT PROVIDES A LEAD-ACID BATTERY?
24- VOLT, 42- AMP/ HOUR.
WHERE DOES THE DC IS OBTAINED?
BOTH GENERATORS AND BATTERY.
WHAT DOES THE STARTER GENERATORS DO?
PRODUCE TORQUE FOR STARTING AND GENERATES ELECTRICAL CURRENT FOR STARTING AS WELL
WHICH IS THE CURRENT OF THE STARTER GENERATORS?
30V, 250 AMP DC.
THE STARTER GENERATORS ACTS AS A STARTER AND …
DRIVES THE ENGINE COMPRESSOR SECTION THROUGH THE ACCESSORY GEARING.
AS THE COMPRESSOR TURNS, THE STARTER GENERATORS CAN DRAW UP TO 1,100 AMPS…
JUST BEFORE DROPPING OFF TO 300 AMPS AS THE ENGINE ACCELERATES TO APROX. 20% N1.
WHAT DOES THE VOLTAGE REGULATOR MONITOR?
MONITORS THE OUTPUT VOLTAGE OF THE STARTER GENERATOR
HOW DOES TEH VOLTAGE REGULATOR MAINTAIN A CONSTANT CHARGE?
IT CONTROLS THE CHARGE TO MAINTAIN IT CONSTANT UNDER DIFFERENT FLIGHT CONDITIONS SUCH AS SPEED, LOAD AND TEMPERATURE.
DOES EACH GENERATOR HAVE IT´S OWN VOLTAGE REGULATOR?
YES
WHAT DOES THE VOLTAGE REGULATOR PROVIDE?
GENERATOR PARALLEL OPERATION, OVER-VOLTAGE PROTECTION AND OVER-CURRENT PROTECTION
HOW DOES THE VOLTAGE REGULATOR BEGIN REGULATING THE GENERATOR´S OUTPUT?
USES RESIDUAL VOLTAGE TO BUILD THE OUTPUT BEFORE THE REGULATION CIRCUIT CAN CONTROL IT.
WHAT HAPPENS WHEN THE RESIDUAL VOLTAGE IS APPLIED?
THE FIELD IS EXITED, AND THE OUTPUT INCREASES TO A LEVEL SUFFICIENT FOR THE CIRCUIT CONTROL REGULATOR TO TAKE OVER.
WHAT IS THE ROLE OF THE STARTER- GENERATOR´S OUTPUT REGULATOR?
THE OUTPUT REGULATOR ENSURES THE VOLTAGE REMAINS AT 28.25V, AND THE LOADMETERS WILL INDICATE NO OVER-VOLTAGE. THE OUTPUT GENERATOR IS AT LEAST 0.6 VDC HIGHER THAN THE BUS VOLTAGE.
WHAT HAPPENS WHEN THE REVERSE CURRENT RELAY IS ENERGIZED?
THE STARTER GENERATOR´S OUTPUT IS CONNECTED TO THE “GENERATOR BUS”
