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Power Generation -Output Voltage

10/15/2007 8:19 PM

Hi, thanks to everyone for their superb and expert contributions to my previous questions. Now,

Why is it when I measure across 2 lines of the Generator Output I get let say .....480 Volts. Then When I measure from Line to Neutral, I get 277 Volts ?

Thanks

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#1

Re: Power Generation -Output Voltage

10/15/2007 11:35 PM

The voltage between the separate phases and neutral is the generator voltage divided by the square root of 3.

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Participant

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#2

Re: Power Generation -Output Voltage

10/16/2007 2:51 AM

Very simpel Line to neutral voltage i.e phase voltage Vph = is divided by 1.73 (Square root of 3) of line to line voltage VL for the star connection of generator so that is equal to 480/1.73=277.

Getting?

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Anonymous Poster
#3

Re: Power Generation -Output Voltage

10/16/2007 10:14 AM

For any 3 phase 4 wire voltage source, the voltage from phase to phase will be the stated voltage rating and the voltage from any phase to neutral (4th wire) will be the phase to phase voltage divided by the square root of 3.

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#4

Re: Power Generation -Output Voltage

10/17/2007 7:10 AM

FYI:

I have requested the CR4 administration to remove your user's name. suggest you change it yourself before you are being forced to. This kind of language have no place here.

Wangito.

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#5
In reply to #4

Re: Power Generation -Output Voltage

10/17/2007 8:42 AM

????????????????

No bad language here. It's implied, but so what. We're adults, aren't we. I hope the admins don't feel a need to police everything.

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Anonymous Poster
#6
In reply to #5

Re: Power Generation -Output Voltage

10/17/2007 10:04 AM

I don't even know what it is that is considered to be offensive to anyone. There certainly wasn't any intent to offend anyone.

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#7
In reply to #4

Re: Power Generation -Output Voltage

10/17/2007 11:00 AM

I don't see anything here that's beyond the pale.

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#10
In reply to #7

Re: Power Generation -Output Voltage

10/17/2007 12:50 PM

It's a shame that obscene language becomes standard practice. I was referring to the poster's user name. If this is not beyond the pale, Than I just don't know what pale is.

Wangito.

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#11
In reply to #10

Re: Power Generation -Output Voltage

10/17/2007 1:02 PM

There apparently is a language gap issue here leading to some mis-interpretation. My first name is Joe. The remaining letters are an acronym for the company I am currently working for.

I don't know what that combination of letters means in your language. But I can assure that there was no intent to imply anything offensive to anyone.

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#12
In reply to #11

Re: Power Generation -Output Voltage

10/17/2007 1:07 PM

Joe, he's referring to name of the original poster watdefak. At least that's how I interpreted it. That we have to clear up whose name is obscene makes it a pretty moot point.

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#14
In reply to #11

Re: Power Generation -Output Voltage

10/17/2007 8:27 PM

Hello Joe,

My complaint was NEVER meant for you. it is, and was directed at the original poster, who for his own private reasons doesn't even bother to reply and/or take some actions to clean his act.

The fact that he is writing the four letter word with just three, doesn't make it right. I still think that it belongs to a low class bar gathering and not to an engineering forum.

Wangito.

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Anonymous Poster
#8

Re: Power Generation -Output Voltage

10/17/2007 12:40 PM

Answers valid only four a 4 wire Delta connection.

Try a wye or Star..........different answer..............

MR, GUY

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Anonymous Poster
#9
In reply to #8

Re: Power Generation -Output Voltage

10/17/2007 12:46 PM

I've never heard of a 4 wire delta. Only a 4 wire star (or wye).

Can you provide a diagram of a 4 wire delta?

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#13

Re: Power Generation -Output Voltage

10/17/2007 4:16 PM

4 wire delta used to be pretty standard in industial plants... more dangerous than a wye though at 460 or 480. Now its more common to only see 240 delta with 'stinger'(high leg). But there are alot of old plants with 460.

watdefac...take a look at this site for an easy explanation:

http://mysite.du.edu/~jcalvert/tech/threeph.htm

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#15
In reply to #13

Re: Power Generation -Output Voltage

10/17/2007 10:05 PM

Thank you very much for this information Switchman.

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Anonymous Poster (1); Chris Leonard (1); jdretired (1); jitu_deesa (1); Silas Marner (2); Switchman (1); wangito (3); watdefak (1)

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