Three-phase electric power | Wikipedia audio article
Channel: wikipedia tts
Date: 02/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Three-phase_electric_power


00:00:57 1 Principle
00:03:09 1.1 Advantages
00:06:54 1.2 Phase sequence
00:07:38 2 Generation and distribution
00:09:00 3 Transformer connections
00:10:47 4 Three-wire and four-wire circuits
00:15:06 5 Balanced circuits
00:17:04 5.1 Wye (Y)  also called Star
00:20:25 5.2 Delta (Δ)
00:25:13 6 Single-phase loads
00:30:20 6.1 Unbalanced loads
00:32:20 6.2 Non-linear loads
00:33:14 7 Three-phase loads
00:33:44 8 Phase converters
00:34:32 9 Alternatives to three-phase
00:37:53 10 Color codes
00:40:15 11 See also
00:43:14 12 Notes
00:44:03 13 References



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SUMMARY
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Three-phase electric power is a common method of alternating current electric power generation, transmission, and distribution. It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power. It is also used to power large motors and other heavy loads.
A three-wire three-phase circuit is usually more economical than an equivalent two-wire single-phase circuit at the same line to ground voltage because it uses less conductor material to transmit a given amount of electrical power.
Polyphase power systems were independently invented by Galileo Ferraris, Mikhail Dolivo-Dobrovolsky, Jonas Wenström, John Hopkinson and Nikola Tesla in the late 1880s.