| Author |
How to caclulate Short Circuit Impedance For an Industrial Plant .
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| eoots2000 2006-05-27, 1:21 am |
| We have an Industrial plant with primery voltage 33KV and secondry 6KV and
th-ry voltage 400V .
I want to calculate short circuit current.
It means that i should to know equal Impedance of all circuits.
all of consumers loads totaly is 4MVA.
i Want an Algorythm or program or sample sheet calculation.
thnks.
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| John McLean 2006-05-27, 2:21 am |
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"eoots2000" <eoots2000@yahoo.com> wrote in message
news:5e05216c6d56d548d34264cb0fa8f4ef@localhost.talkaboutelectronicequipment.com...
> We have an Industrial plant with primery voltage 33KV and secondry 6KV and
> th-ry voltage 400V .
> I want to calculate short circuit current.
> It means that i should to know equal Impedance of all circuits.
> all of consumers loads totaly is 4MVA.
> i Want an Algorythm or program or sample sheet calculation.
> thnks.
>
Please would be nice.
Jaymack
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| TimPerry 2006-05-27, 12:21 pm |
| eoots2000 wrote:
> We have an Industrial plant with primery voltage 33KV and secondry
> 6KV and th-ry voltage 400V .
> I want to calculate short circuit current.
> It means that i should to know equal Impedance of all circuits.
> all of consumers loads totaly is 4MVA.
> i Want an Algorythm or program or sample sheet calculation.
> thnks.
insuficient data.... you can not get there from here.
the smart XXX answer is zero current because the breakers will have tripped.
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| daestrom 2006-05-28, 12:21 pm |
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"eoots2000" <eoots2000@yahoo.com> wrote in message
news:5e05216c6d56d548d34264cb0fa8f4ef@localhost.talkaboutelectronicequipment.com...
> We have an Industrial plant with primery voltage 33KV and secondry 6KV and
> th-ry voltage 400V .
> I want to calculate short circuit current.
> It means that i should to know equal Impedance of all circuits.
> all of consumers loads totaly is 4MVA.
> i Want an Algorythm or program or sample sheet calculation.
> thnks.
You need to know more about the transformer. They typically include
synchronous reactance, as well as transient and sub-transient reactances.
And the line feeding the transformer primary.
This really is an involved calculation, it is best to hire a pro rather than
get advice on USENET for this.
daestrom
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| operator jay 2006-05-28, 5:21 pm |
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"daestrom" <daestrom@NO_SPAM_HEREtwcny.rr.com> wrote in message
news:8sieg.263$3B.32@twister.nyroc.rr.com...
>
> "eoots2000" <eoots2000@yahoo.com> wrote in message
>
news:5e05216c6d56d548d34264cb0fa8f4ef@localhost.talkaboutelectronicequipment.com...
and[color=darkred]
>
> You need to know more about the transformer. They typically include
> synchronous reactance, as well as transient and sub-transient reactances.
> And the line feeding the transformer primary.
>
> This really is an involved calculation, it is best to hire a pro rather
than
> get advice on USENET for this.
>
> daestrom
>
Transient and subtransient for a transformer? Really?
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| Paul Hovnanian P.E. 2006-05-28, 6:21 pm |
| daestrom wrote:
>
> "eoots2000" <eoots2000@yahoo.com> wrote in message
> news:5e05216c6d56d548d34264cb0fa8f4ef@localhost.talkaboutelectronicequipment.com...
>
> You need to know more about the transformer. They typically include
> synchronous reactance, as well as transient and sub-transient reactances.
> And the line feeding the transformer primary.
>
> This really is an involved calculation, it is best to hire a pro rather than
> get advice on USENET for this.
>
> daestrom
If the plant has any good sized rotating machinery, that can contribute
to the fault current as well. Like others have said, the OP needs a PE
to look at the problem.
--
Paul Hovnanian mailto:Paul@Hovnanian.com
------------------------------------------------------------------
Sacred cows make the best hamburger. -- Mark Twain
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| daestrom 2006-05-29, 11:21 am |
|
"operator jay" <none@none.none> wrote in message
news:jRmeg.1782$ou6.1032@newsfe20.lga...
>
> "daestrom" <daestrom@NO_SPAM_HEREtwcny.rr.com> wrote in message
> news:8sieg.263$3B.32@twister.nyroc.rr.com...
> news:5e05216c6d56d548d34264cb0fa8f4ef@localhost.talkaboutelectronicequipment.com...
> and
> than
>
> Transient and subtransient for a transformer? Really?
Ah, you got me. I slipped up. I was thinking he had an industrial
generator feeding a transformer (I work mostly with power plants, and that
is the common configuration we work with for such calcs). Then the
generator is feeding the fault through the transformer.
But as I look again, I guess he's talking about a primary line feeding a
substation into his 'industrial plant'. The other factor he would need then
is the line impedance and its short-circuit capability.
daestrom
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