Talk:Polyphase system

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does any one know if Japan has a 230v single phase 50hz supply avaible commercialy —Preceding unsigned comment added by 204.191.51.253 (talk) 18:26, 10 November 2007 (UTC)

From the article:

A polyphase coil takes advantage of the three phase's energy is made up of: induction, neutralization, and capacitance.

Ewwww. -- The Anome 13:55, 29 Nov 2003 (UTC)

What is LCR?

This could really use some graphs or diagrams or...some sort of visualization. --Atario 19:11, 8 Jul 2004 (UTC)

"Three phase power is commonly found in industrial applications and LCR circuits."

What is an LCR circuit? Did you mean RLC circuit? if so, what does it have to do with three-phase power? - Omegatron 13:39, Jul 16, 2004 (UTC)

Polyphase_coil says something about it.

there is no mention of other voltages availbile eg, in Canada\US

277/480, 347/600, 240/416.. as well as the difference in polyphase systems such as delta connections, wye connections etc.

Volates in north america polyphase are not limited to 120/208

delta is a live-live connection and wye is live-neutral connection. So this is covered in the article. Also some of the differences you mention might result from measuring either peek or mean(sp?) voltage.

Not all polyphase motors are self-starting (nor simple in construction). Ie. synchronius (sp? synchronic?) motor won't start and reach synchronic speed without either running in asynchronious mode (this means rotor has to be capable of both modes) or controlled frequency changes (this practically means computerised dedicated power supply).

[edit] Why a page for "poly"-phase, without a list of applicable poly-phases?

Generally this article seems to be useless because it seems to claim a huge variety of polyphase power systems exist. But there are only two types of phased power systems in common use today, known as single-phase or three-phase. Split-phase can be a combination of either of these two. Two-phase is considered an antique relic and is not used anymore.

Common use:

  • Single-phase electric power - Used by most high amperage American/European residential devices, 230v Amercian or 560v European
  • Three-phase electric power - Used primarily for high horsepower motors, but can still be found in residential settings if a building is a large condominium or commercial skyscraper with apartments. Direct voltage is 480-volt American.

Combination use:

  • Split-phase electric power - For single-phase power, it is used by most low amperage American/European residential devives, 115v American or 230v European. For three-phase power, the voltages can be 208-volt American if 2 of the 3 phases are used for single-phase loads, and can be used as three American 120v split-phase circuits for residential/commercial/industrial applications.

Considered obsolete:

So what are these other phase wiring designs that this article tries to suggest may exist? It's either single phase or three phase. Nobody used four-phase or five-phase, etc. Polyphase suggests that other systems than three-phase power are in use in the world today.... but if not, then why not just call it three-phase electrical power? DMahalko (talk) 00:00, 16 May 2008 (UTC)