22-01-2011, 03:24 PM
BEN McQUILLAN
WHAT TO TAKE HOME FROM THIS SEMINAR…
A MORE INTIMATE KNOWLEDGE OF THE ELECTRICAL SYSTEM OF YOUR AIRPLANE
AN OPERATIONAL UNDERSTANDING OF ELECTRICAL SYSTEM PROTECTION
FLEXIBLE DEFINITIONS OF ESSENTIAL & NON-ESSENTIAL ELECTRICAL SYSTEMS
A “CAPTAIN MINDSET” FOR THE MANAGEMENT OF YOUR AIRCRAFT SYSTEMS
WHAT IS A CIRCUIT BREAKER?
A “GATE” THROUGH WHICH ELECTRICITY TRAVELS FROM THE BATTERY TO THE COMPONENT WHICH THE CIRCUIT BREAKER PROTECTS
ABLE TO OPEN AUTOMATICALLY WHEN THE WIRING OF THE CIRCUIT GETS TOO HOT (TOO MUCH VOLTAGE AND/OR RESISTANCE) TO REMOVE ALL ELECTRICITY FROM CONTINUING BEYOND THE BREAKER TO THE COMPROMISED AREA
TYPES OF CIRCUIT BREAKERS
PULL-TYPE CIRCUIT BREAKERS
NON PULL-TYPE CIRCUIT BREAKERS
CIRCUIT BREAKER SWITCHES
WHAT DO THEY DO?
A CIRCUIT BREAKER SENSES AN OVERLOAD CONDITION WITHIN ITS ELECTRICAL CIRCUIT
GROUND FAULTS/ARCING
OVER-VOLTAGE/OVER-TEMPERATURE
IT WILL AUTOMATICALLY PREVENT ANY BATTERY POWER FROM CONTINUING BEYOND THE BREAKER TO THE FAULTY WIRING & COMPONENT
HOW DO THEY DO IT?
NORMAL LOAD VS. OVERLOAD
CIRCUITS TYPICALLY CARRY ½ THEIR RATED LOAD (NUMBER ON BREAKER LABEL)
OVERLOAD = EXCESSIVE HEAT
EXCESSIVE HEAT TRIPS BREAKER
NORMALLY FLAT LAYERED METAL STRIPS EXPAND AT DIFFERENT RATES, CURVE, AND BREAK AWAY FROM ELECTRICAL CONNECTION
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