3.1 Generation, Transmission and Distribution of Electricity

• Methods of generating electrical energy
• The power transmission network and its components
• The 3-phase 4-wire distribution circuit
• The power grid, and its importance to a country

• describe methods of generation of electrical energy
• explain the functions of components in the electrical power transmission network
• draw a 3-phase 4-wire distribution circuit of a power line
• model an electric power grid network
• appreciate the importance of a grid system in a country

“How is electricity generated and transmitted to the consumer?”

The titles are open to everyone. Reading a lesson needs an account — sign in or create one.

1. Generation, transmission and distribution of electricity
   40 min · 1 practice tasks · quiz
   How electricity is generated by different methods, how it is transmitted at high voltage and distributed to consumers, the components of the network, the 3-phase 4-wire system, and the importance of the national grid.
2. How a generator makes electricity
   40 min · 1 practice tasks · quiz
   Almost every station spins a generator: a changing magnetic field induces an emf. The energy source only differs in what turns the shaft.
3. Hydroelectric generation
   40 min · 1 practice tasks · quiz
   Falling water from a dam spins a turbine-generator. Kenya's Seven Forks cascade on the Tana includes Masinga; drought cuts hydro output.
4. Geothermal generation at Olkaria
   40 min · 1 practice tasks · quiz
   Steam from hot Rift rock at Olkaria spins a turbine-generator. It is Kenya's steadiest large renewable because it does not wait for rain.
5. Wind and solar generation
   40 min · 1 practice tasks · quiz
   Wind still turns a generator (Lake Turkana, Ngong). Solar PV makes DC from light and an inverter makes AC (Garissa). Both are variable.
6. Thermal, nuclear, biomass and tidal
   40 min · 1 practice tasks · quiz
   Thermal plants burn fuel to make steam (Kipevu). Nuclear, biomass and tidal are other methods. Kenya uses thermal mainly as costly backup.
7. Kenya's generation mix: KenGen, IPPs and KPLC
   40 min · 1 practice tasks · quiz
   KenGen and IPPs generate; KETRACO transmits; KPLC distributes and sells. Kenya's mix is mostly geothermal, hydro, wind and solar.
8. Why transmission voltage is stepped up
   40 min · 1 practice tasks · quiz
   P = V I so higher V means lower I. Line loss is I squared R. Stepping up from about 11 kV to 132-400 kV is how Olkaria power reaches Nairobi without cooking the wires.
9. Transmission network components
   40 min · 1 practice tasks · quiz
   Generator, step-up transformer, line and pylon, insulators, circuit breaker and isolator, step-down substation: each has a function you must explain.
10. Kenya transmission voltages
    40 min · 1 practice tasks · quiz
    A voltage ladder: 400/220/132 kV transmission, 66/33/11 kV toward distribution, 415/240 V at the consumer. kilo means times 1000.
11. The distribution network
    40 min · 1 practice tasks · quiz
    After transmission, KPLC takes power through 33 kV and 11 kV feeders and pole transformers to 415/240 V consumers. Distribution is local; transmission is bulk and long-distance.
12. Drawing the 3-phase 4-wire circuit
    40 min · 1 practice tasks · quiz
    Four wires: L1, L2, L3 and N. About 415 V line-to-line, 240 V line-to-neutral. Phases 120 degrees apart. A house takes one phase; a workshop may take all three.
13. Modelling the national grid
    40 min · 1 practice tasks · quiz
    Build a simple model: stations as nodes (Olkaria, Masinga, Turkana), HV lines as links through a Nairobi hub, then distribution tails. Unplug one station and the others still feed the hub.
14. Why the national grid matters to Kenya
    40 min · 1 practice tasks · quiz
    The grid shares power, backs up failed or drought-hit plant, dispatches clean energy first, and underpins homes, hospitals and industry. It is shared infrastructure - citizenship.