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MARY63
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Join Date: Aug 2020
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Short Circuit Current

08/19/2020 2:20 AM

how can i convert 10KA/1S to ??/3S
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SolarEagle
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#1

Re: short circuit current

08/19/2020 2:41 AM

https://www.powerandcables.com/product/product-category/catu-mt-9801/

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PeterT
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#2

Re: Short Circuit Current

08/19/2020 8:06 AM

Is this for the short-time or peak withstand current for a HV switch? IEEE Std C37.30.1 (IEEE Standard Requirements for AC High-Voltage Air Switches Rated above 1000V) gives some info in its Tables, with a reference to "allowable I2t variations" in its section 8.3.5.1. You should take a look at that. So it may be that you can calculate an equivalent using I2t.

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Rixter
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#3

Re: Short Circuit Current

08/19/2020 9:22 AM

Here's a rough estimate: Power is proportional to current squared, and Energy is equal to power x time, E = I2Rt. For equal amount of energy, if time is multiplied by 3, I2 would be divided by 3, or I would be divided by sqrt(3).

Using this logic, 10KA/1S ~ 5.77KA/3S.

This assumes that the time is short enough that not much heat can escape.
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PeterT
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#4
In reply to #3

Re: Short Circuit Current

08/20/2020 9:33 AM

You did the math that I was leaving for the OP. That's what I was getting at. Thanks.

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MARY63
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#5
In reply to #3

Re: Short Circuit Current

08/21/2020 1:34 AM

Thanks PeterT
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MARY63
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#7
In reply to #3

Re: Short Circuit Current

08/21/2020 11:58 PM

thanks Rixter
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#6

Re: Short Circuit Current

08/21/2020 2:09 PM

Using basic arithmetic.

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Anonymous Poster #1
#8

Re: Short Circuit Current

08/31/2020 7:47 AM

30kA
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Anonymous Poster (1); MARY63 (2); PeterT (2); PWSlack (1); Rixter (1); SolarEagle (1)

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