AGK Electrics Flashcards
Solenoid
Uses electromagnetic incudtion to move a core
2 contacts and a core
Relay
Magnetically operated switch
Used in a high current circuit.
Coil wrapped around a fixed core moves a switch by electromagnetic induction
Generator
Stationary magnets and split ring commutator
Alternator
Moving magnets and bridge rectifier unit
Unit for ac power
Volt-amp
Ac generators and rated in
KVA
Voltage control unit
Manipulates current to electromagnet in a generator control voltage output
Voltage varies with
RPM
Consumer loads
Standard AC
115V
400Hz
3 phase
Standard DC voltages
14 or 28v
Output frequency increases with
Increasing RPM
CSD
Hydrostatic system that monitors frequency and phase and ensures generator RPM remains constant
IGD
Combines generator and CSD
Unipole
Earth return using airframe
Dipole
Wire return and less chance of short circuit
Paralleled system
All geerators and connected simultaneously
Needs same:
Voltage
Phase
Frequency
Split system
Will connect generator and other bus bar only if a failure using bus tie
Fire handle operates
Generator circuit breaker
Excitator control breaker
A split busbar system can use
Frequency wild generators
APU generator is generally
Frequency wild
BAT busbar
Provides minimum power to essential loads eg fire extinguishers
Hot busbar
Is permanently connected to its battery
Seizure
Excessive current without back emf can cause fire
Run away
When something is disconnected from the motor and ir over speeds causing physical damage
