At higher altitudes the voltage stress will definetly cause the air to electrically break down sooner at a lower voltage level(approx.2-10%).(google for these actual correction values/formula)
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| Author: | NRAO_Safety Guy [ Fri Feb 19, 2010 9:14 am ] |
| Post subject: | Arc Flash in High Altitude Applications |
What impact would lower rH and quite high altitudes have on hazard distances and arc flash hazards in general? We are working on a 23 kV transmission system at 5000 meters in the Andes Mountains. |
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| Author: | ghostbuster [ Fri Feb 19, 2010 10:20 am ] |
| Post subject: | |
At higher altitudes the voltage stress will definetly cause the air to electrically break down sooner at a lower voltage level(approx.2-10%).(google for these actual correction values/formula)
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| Author: | NRAO_Safety Guy [ Fri Feb 19, 2010 11:39 am ] |
| Post subject: | |
Thanks for the info. I have been Googling around but an having trouble finding definitive info as to how much impact it might have. Will keep looking. |
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| Author: | ghostbuster [ Fri Feb 19, 2010 2:14 pm ] |
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Try this link: http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F6616%2F17682%2F00816711.pdf%3Farnumber%3D816711&authDecision=-203 Study of the breakdown voltage of the air in high altitudes, applying lightning impulses (1.2/50 μs) under conditions of controlled humidity and temperature Note:You will need to be a I.E.E.E. member I will try to get the sphere gap graphs for you.
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| Author: | ghostbuster [ Fri Feb 19, 2010 4:09 pm ] |
| Post subject: | |
Here is a link to these spark gap correction factors for humidity and altitude(it is the 4th one down on this list).Enjoy )
http://www.google.ca/search?sourceid=navclient&ie=UTF-8&rlz=1T4RNWE_enCA309CA309&q=sphere+gaps+correction+factors |
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