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Energy and the Environment

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  1. Introduction
  2. Transport Fuels
    5 Topics
  3. Energy Sources: Fossil Fuels
    8 Topics
  4. Energy Sources: Renewables
    10 Topics
  5. Electricity
    10 Topics
  6. Energy Sources: Nuclear
    6 Topics
  7. Demand Response
    6 Topics
  8. Energy/Emissions Policy
    15 Topics
  9. Energy Economics
    2 Topics
    1 Quiz
Lesson 5, Topic 5
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Transmission and Distribution

Abdulaziz July 16, 2020
Lesson Progress
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Windwheels and power transmission lines in Germany
Windwheels and power transmission lines in Germany
What is the difference between transmission and distribution lines ?
  • Transmission lines power plants to substations (HV 69 kV up to 765 kV) bi directional
  • Distribution lines bring electricity from substations to end users (LV 4KV and 69KV) traditionally been mono directional not initially designed for distributed generation and bi directional flow
  • Grid is (generally) a passive system (limited data to accommodate distributed generation)

Delivery of electric power

  • only large consumers are fed directly from distribution
  • most utility customers are connected to a transformer
  • transformer reduces the distribution voltage to the low voltage used by lighting and interior wiring systems
Portrait of young engineer at the transformer station
Portrait of young engineer at the transformer station
transformer substation at dusk
transformer substation at dusk

Transmission and Distribution Lines

Electricity Grid Schematic
  • HV Primary distribution voltage is ‘medium voltage’ (2kV-35kV)
  • LV Secondary distribution connects to non industrial premises (220- 240v)
Transmission towers
Stobie poles
Stobie poles and transmission towers *