Author Topic: R S T,L1 L2 L3, U V W  (Read 27327 times)

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Offline Simon123Topic starter

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R S T,L1 L2 L3, U V W
« on: March 28, 2014, 01:24:14 pm »
Hello!

I want to know, what RST in three phase system means?
Is it short for some words or something?

Thanks!
 

Offline madires

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Re: R S T,L1 L2 L3, U V W
« Reply #1 on: March 28, 2014, 01:50:09 pm »
R-S-T is an old German naming convention for L1-L2-L3. It's not any abbreviation, just three consecutive letters. On some 3-phase motors you might also find U-V-W and X-Y-Z for the coils.
« Last Edit: March 28, 2014, 01:51:57 pm by madires »
 

Offline Simon123Topic starter

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Re: R S T,L1 L2 L3, U V W
« Reply #2 on: March 28, 2014, 02:02:12 pm »
Thanks madires.
 

Offline deth502

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Re: R S T,L1 L2 L3, U V W
« Reply #3 on: March 28, 2014, 08:37:17 pm »
yup, just arbitrary consecutive letters, just like naming them A-B-C
 

Offline Rory

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Re: R S T,L1 L2 L3, U V W
« Reply #4 on: March 28, 2014, 10:24:38 pm »
Did you even bother doing a Google search before asking here?
 

Offline kingoftaurus

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Re: R S T,L1 L2 L3, U V W
« Reply #5 on: March 29, 2014, 02:01:32 am »
Sometimes a human response is better.
 

Offline Kryoclasm

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Re: R S T,L1 L2 L3, U V W
« Reply #6 on: March 29, 2014, 04:16:55 am »
R S T L N E      I'll take V W and a U Pat.




T _ R E E    _ _ _ S E    _ _ T _ R.
“I predict that very shortly the old-fashioned incandescent lamp, having a filament heated to brightness by the passage of electric current through it, will entirely disappear.” -Nikola Tesla
 

Offline kingoftaurus

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Re: R S T,L1 L2 L3, U V W
« Reply #7 on: March 29, 2014, 06:44:31 am »
R S T L N E      I'll take V W and a U Pat.




T _ R E E    _ _ _ S E    _ _ T _ R.

I'd like to solve "Three Phase Motor"
 

Offline AKM

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Re: R S T,L1 L2 L3, U V W
« Reply #8 on: November 05, 2020, 07:55:53 pm »
It means Reference (phase), secondary (phase) and tetriary (phase) in French.
 
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Offline nightfire

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Re: R S T,L1 L2 L3, U V W
« Reply #9 on: November 05, 2020, 09:50:23 pm »
Also in old systems (pre-1975) to be found is some old color coding: Yellow (L1), Green (L2) and Violet (L3), sometimes still used in high voltage installments.
In those old systems black and/or grey was the PE...
 

Online Electro Fan

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Re: R S T,L1 L2 L3, U V W
« Reply #10 on: November 05, 2020, 10:17:50 pm »
It means Reference (phase), secondary (phase) and tetriary (phase) in French.

Is there a reference link for this definition? Thx
 

Offline Kjelt

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Re: R S T,L1 L2 L3, U V W
« Reply #11 on: November 05, 2020, 10:42:24 pm »
Not sure about this but I recall and checked that one of the first inventors of AC current, Galileo Ferraris named the primary vector R, in his 1888 paper, probably after Rotazioni (Rotation).
Since I can not read Italian perhaps one of our Italian forum members would be kind enough to check.

If it was just a sequence of random characters they could have started with A,B,C  :)

http://ieeemilestones.ethw.org/images/a/a0/1-Galileo_Ferraris_Rotating-field--Rotazioni_Elettrodinamiche.pdf


Edit: Or perhaps R is the standard mathematical name for a Rotation vector, a Euclidean vector whose direction is that of the axis of a rotation and magnitude is the angle of the rotation.
Perhaps someone can confirm this ?

« Last Edit: November 05, 2020, 10:53:53 pm by Kjelt »
 


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