Systems and Components Flashcards
Three Phase Theory
For AC transmission of electricity over longer distances
Why AC
Easier + cheaper for longer distance electricity transfer
Why AC –> DC conversion
reduce power loss
Balanced 3 Phases
All shifted by 120° …But why is this ideal tho???!!
If you had 4 phases would 90° be best???
Why 3 phase
single phase (system?) to provide 3 phases needs 1 wire for each phase and 1 neutral for each f those wires
3 phase need 1 wire for each phase and a common neutral
Star Connection
Components share only one node
Something something…look at lecture slide13
Delta Connection
One component shares the nodes of the other components. Then other shit happens
Delta Connection
One component shares the nodes of the other components. Then other shit happens
No neutral points, so the phase and line voltages are the same. But the stupid root 3 thing comes up again but for current instead
“You make shitty notes, but I feel your pain” - Future Richmond
Line voltage and phase voltage are also a thing…
GOOD LUCK….Haha, nice.
Parts of Power System
Generation
Transmission
Distribution
Benefits of Centralised Grid
- Utilise cheapest way to generate electricity
- Reliable power generation
- Reserved power can still be shared in the system
Frequency change in grid
- Changes because of an imbalance of the consumers and producers
- Lower frequencies indicate a higher number of consumers
- Higher frequencies indicate a larger number of producers
Underground vs Overhead cables
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Why High voltages used for long distance transmission
The percentage power loss is lower at higher voltages
Electrical Generator
- Makes the electricity
* Produces active (normal) power, can also produce/consume reactive power. These combine to make complex power
