Systems and Components Flashcards

1
Q

Three Phase Theory

A

For AC transmission of electricity over longer distances

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2
Q

Why AC

A

Easier + cheaper for longer distance electricity transfer

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3
Q

Why AC –> DC conversion

A

reduce power loss

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4
Q

Balanced 3 Phases

A

All shifted by 120° …But why is this ideal tho???!!

If you had 4 phases would 90° be best???

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5
Q

Why 3 phase

A

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

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6
Q

Star Connection

A

Components share only one node

Something something…look at lecture slide13

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7
Q

Delta Connection

A

One component shares the nodes of the other components. Then other shit happens

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8
Q

Delta Connection

A

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

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9
Q

Line voltage and phase voltage are also a thing…

A

GOOD LUCK….Haha, nice.

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10
Q

Parts of Power System

A

Generation
Transmission
Distribution

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11
Q

Benefits of Centralised Grid

A
  • Utilise cheapest way to generate electricity
  • Reliable power generation
  • Reserved power can still be shared in the system
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12
Q

Frequency change in grid

A
  • 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
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13
Q

Underground vs Overhead cables

A

`

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14
Q

Why High voltages used for long distance transmission

A

The percentage power loss is lower at higher voltages

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15
Q

Electrical Generator

A
  • Makes the electricity

* Produces active (normal) power, can also produce/consume reactive power. These combine to make complex power

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16
Q

Bus (Busbar)

A

• Low impedance connection between multiple electrical components

17
Q

Transformers (robots in disguise!)

A
  • Used to step the voltage up or down
  • Several are often used consecutively to bring the voltage up or down by large amounts e,g. step down from 400 kV to 230 V
18
Q

Switchgear

A

read notes

or at least try to pay attention

19
Q

Substations

A

Are a thing…

20
Q

Transmission Cables

A

Used to transfer electricity over long distances between generators, substations and loads

21
Q

Load

A

Anything that consumes active power

One or collective loads

22
Q

Transmission cables

A

underground is more reliable/durable but are more expensive because of installation and maintenance

23
Q

Overhead line

A

made up of conductors, insulators and supporting structures

24
Q

ACSR

A

Type of conductor usually used for power transmission Aluminium Conductor Steel Reinforced

25
Insulators in transmission
Support and anchor conductors Insulate tower and ground Normally ceramics
26
Modelling
Transmission lines can be modelled using steady state conditions
27
Magnetic coupling
Happens between any two conductor and something else...