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Tool Talk Discussion Forum

Re: Different 3-phase question

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Author  [Modern View]

04-22-2013 20:05:38

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Sorry, I wasn't thinking. 110 should have been 120 in that case. I understand why.

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John T

04-23-2013 05:38:55

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 Re: Different 3-phase question in reply to sflem849, 04-22-2013 20:05:38  
NO PROBLEM, great questions, its been a fun and informative discussion and hopefully someone learned a thing or two, yours truly included...

John T

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04-23-2013 06:31:25

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 Re: Different 3-phase question in reply to John T, 04-23-2013 05:38:55  
Quoting Removed, click Modern View to see

One of our trouble shooting problems last night involved a delta wired high leg transformer. They had four DMMS and you had to say what the expected reading was on each DMM.

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John T

04-23-2013 08:20:43

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 Re: Different 3-phase question in reply to sflem849, 04-23-2013 06:31:25  
It should have been near or in mathmatecial proportion to

240 L1 L2
240 L2 L3
240 L3 L1 (any outher corner to any other corner)

120 L1 N
120 L3 N (The Center tapped winding/transformer is from L 1 to L3)

Of course, a shorted winding, very non proportional loads, wiring, resistive problems and a whole other sort of problems may cause differences, but you already know that

Good Luck with it

John T

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04-23-2013 06:35:54

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 Re: Different 3-phase question in reply to sflem849, 04-23-2013 06:31:25  
Quoting Removed, click Modern View to seeHope they let you see where the meters were connected! :)

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