- 2071 Bhadra · 6 marks
Evolution of power systems and milestones
Short answer
Power systems evolved from isolated DC stations to interconnected AC/HVDC grids. Key milestones: Faraday 1831, Edison 1882, transformer 1885, Tesla 1888, Lauffen-Frankfurt 1891, Niagara 1896, Pharping 1911, 380 kV 1952, HVDC 1954, 765 kV 1969, UHV and smart grids.
Explain the evolution of power system and mention its major milestones.
The power system grew from small isolated DC stations in the 1880s to today's huge interconnected AC/HVDC grids. Its evolution can be followed through these milestones.
Major milestones
| Year | Milestone |
|---|---|
| 1831 | Faraday discovers electromagnetic induction, the basis of generators |
| 1879 | Edison's practical incandescent lamp creates demand for electricity |
| 1882 | Edison's Pearl Street station, New York: first central DC station (110 V) |
| 1882 | First hydro plant, Appleton, Wisconsin |
| 1885–86 | Transformer developed (Gaulard–Gibbs, Stanley); first AC distribution at Great Barrington |
| 1888 | Tesla patents polyphase AC system and induction motor |
| 1889–90 | First AC transmission line in USA (Oregon, about 21 km, 4 kV single phase) |
| 1891 | Lauffen–Frankfurt 3-phase line, 175 km, 15 kV: proves long-distance AC |
| 1896 | Niagara Falls hydro to Buffalo: AC wins over DC |
| 1911 | Pharping hydropower (500 kW), first power plant in Nepal |
| 1920s–30s | 220 kV and 287 kV lines; growth of interconnected grids |
| 1952 | First 380 kV line, Sweden |
| 1954 | First commercial HVDC link, Gotland (Sweden) |
| 1965–69 | 735 kV (Canada) and 765 kV (USA) AC lines |
| 1970s | Thyristor valves for HVDC; digital computers for load flow and control |
| 1980s–2000s | SCADA/EMS, deregulation and power markets |
| 2009–10 | 1000 kV UHVAC and ±800 kV UHVDC in China |
| 2000s–now | Large-scale wind and solar, smart grid, FACTS, battery storage, cross-border trade |
Trends seen in the evolution
- DC to AC: The transformer and induction motor made AC dominant.
- Isolated to interconnected: Small plants merged into regional, national and international grids for reliability and economy.
- Rising voltages: From 110 V to 765 kV AC and ±1100 kV DC to carry more power over longer distances.
- Larger units: Generator ratings rose from kW to over 1000 MW.
- Return of DC: HVDC for long-distance and asynchronous links.
- Automation and renewables: Computer control, smart meters, distributed solar/wind.
In Nepal, the system grew from Pharping (1911) to the Integrated Nepal Power System (INPS) at 132/220/400 kV, now linked to India for power trade.
✓ Answer checked by Claude Opus 5.5 (high effort)
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