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  1. Default phase to ground voltages

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    I am a first year app. and trying to figure out how you calculate phase to ground voltages.For ex: 12kv phase to phase is 7200 phase to ground.But when you calculate it out it is different, 12000 divided 1.73=6936

  2. #2
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    Default John.

    It's really an approximation. It's not really 12000, but actually 12470. Actually the 1.73 factor will put you real close.

    Also you have to understand that a lot of folks refer to it in just a close number. Used to always call it twelve five when it's actually 12470. The 4 KV most people mention is actually 4160 phase to phase. Worked a lot of 34.5 KV and we always referred to it as 19.8 phase to ground but I think the pots label says 19920 or something like that. I've heard lots of people mention 24 KV or 25 KV when actually it's 24.9 KV or thereabouts. Common REC voltage anymore and some utilities use it. If you'll look at the pot labels ever time you'll see.

  3. #3

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    12kv phase to phase is 6.9 phase to ground. It's not an approximation. Example:12kv is predominant here on the West coast. And the 12kv transformers are strait 12kv, hooked up phase to phase.

    12,470/1.73=7200

    12,000/1.73=6936

  4. #4
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    Door is spot on here bub... the 1.73 is the multiplier for you phase to ground voltage to determine your phase to phase....

    lineman tend to talk in phase to ground lingo engineers phase to phase... the only time this changes is when lineman work on delta systems... then it's all phase to phase even if it's pick grounded...

    19.9 =34.5 or 35 kv 7.2 is 12.4 14.4 is 24.9 and so on.....

    check the label on the pot and always check with your bird dog... we had a pretty impressive storm here last weekend just got cut loose today...

    had some help with class 2 rubber not cool when your workin 19.9

    for what it's worth

    Edge

  5. #5
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    had some help with class 2 rubber not cool when your workin 19.9

    for what it's worth

    Edge
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    ummmmmmmm i thunk class 2 wuz jus good fer like 17kv ?????????? Dont be tellin me you wuz bettin the farm onnem . That wud hurt me in my heart n on my feelins.

  6. #6
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    Quote Originally Posted by Pootnaigle View Post
    had some help with class 2 rubber not cool when your workin 19.9

    for what it's worth

    Edge
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    ummmmmmmm i thunk class 2 wuz jus good fer like 17kv ?????????? Dont be tellin me you wuz bettin the farm onnem . That wud hurt me in my heart n on my feelins.
    I sure as hell won't poot and fixed the problem asap... was some contractors we had.... got them straight though...

  7. #7

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    Not so true. Most lineman I know refer to the line of what ever the phase to phase voltage is. If we're working a 12kv line, then we call it 12kv. And if the line is 4160, that's what we refer it as unless it's single phase then we call it 2400. But I have also worked in a town where the phase to phase voltage was 2400. You really had to pay attention when you were grabbing a transformer out of the yard. Because out in the farming areas it was all 4160.

    I was never taught to refer to 12,470 as 7200 unless it was a single phase line. But then the lingo is different in every part of the country.

  8. #8
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    [QUOTE=wtdoor67;76370]It's really an approximation. It's not really 12000, but actually 12470. Actually the 1.73 factor will put you real close.

    Wasn't implying there wasn't 12 KV. Since he used 7200 for a phase to ground voltage just meant to clarify it for him. If it was 7200 phase to ground then it would have to be 12470 phase to phase.

    Have used 12 KV pots in delta hookups on 12470 Wye systems. No neutral brought out systems etc.

  9. #9

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    Up here at the "Utility" if anyone cares, we refer to the phase to ground voltage(cept the Delta of course!). 4,800(8304) and 14.4(24,912).

  10. #10
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    [QUOTE=Pootnaigle;76393]had some help with class 2 rubber not cool when your workin 19.9

    for what it's worth

    EdgeQUOTE]

    Sounds like Pikes finest or was it Chain? I hear the Chain brothers have escaped the swamps down south and have migrated north..

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