History of Electrical Network

1882 - The first electrical network
- Pearl Street Station, NYC
- by Thomas Edison
- DC
- Lighting lower Manhattan area
- Underground cables

- Water wheel driven generator was invented
- Appleton, Wisconsin

- DC : Short distance -> excessive power loss at low voltage

1885 - William Stanley invented transformer
- raise AC for transmission & distribution

1888 - Tesla invented induction motor

1888-1893 - first single phase AC system
- Oregon City
- 2x300hp water wheel turbines
- 4kv to Portland

1893 - 1st 3-phase
- 2.3kV
- South California Edison Company

1893-1969 - frequency varied from 25Hz-133Hz
- however due to interconnection, US & Canada fixed 60Hz while Europe;50Hz

1969 - EHV; 765kV commercially used

1970 - Pacific Intertie (Oregon-California)
- 400kV
- 850 miles