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Legacy Personal Blogs Power distribution -Electric Arc Flash–Are we safe ???
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  • Author Author: Former Member
  • Date Created: 16 Mar 2010 5:05 PM Date Created
  • Views 392 views
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  • Comments 1 comment
  • in:industrial
  • in:communications
  • at:design_tips
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Power distribution -Electric Arc Flash–Are we safe ???

Former Member
Former Member
16 Mar 2010
                         There is high risk to life of humans in electric power distribution systems, Danger to human life’s, damage to infrastructure etc, the reason for all these issues is Electric arc, the reason is not having enough awareness, negligence, poor maintenance, insulation failures, electrical spikes, animal interferences etc. Arc flash is a major electrical hazards where 10kA /480v arc flash = 8 dynamite sticks, there have een number of incidents reported daily around the globe for damage to human and systems due to electrical arc flash. So what looks to first and formost solution is PPE personal protection equipments to be used in these areas, there is no technology as such to prevent this as of now, conventionally circuit breakers, fuses, arc resistant switchgears, crowbar systems were and are being used which fully does not eliminate this issue.
 
               Recently in emtech India event participated by GE demonstrated their innovation of eliminating this arc flash by detecting through a optical sensor at which instant the large arc current is transferred to containment using a ablative plasma gun. I just felt like sharing this to our Technology world.
 
               The performance was tremendous with 15x faster arc transfer within 200microsec, 20% energy absorption no dead shorting, reusable containment which is cost effective. GE termed it as GE Arc Vault protection system and video demonstrated its capabilities. Not sure if any other such products have been developed in market ? or only GE is sole designer, let me know your coments if any on same !!!
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  • Former Member
    Former Member over 15 years ago

    Well, don't take this the wrong way. I can tell this was not written by an electrician. There are multitutes of PPE for arc flash protection. So much so the the NFPA, pulisher of the NEC (nfpa70) wrote a thick book of the subject and the standard is set forth in NFPA-70e, electrical saftey in the workplace. It's a large book that is at least 800+ pages. Utility workers are also subject to PUCA. The biggest problem is complience, not one wants to wear an arc flash suit in the summer. So they try to do as much as then can with out it on, then don it as needed. This is every industry you can make saftey devices that work, IF THEY WEAR IT!

    Lets look at some numbers, we all love that right!

    • Arc-flash temps: 11,0000 deg. F, or 6,000 deg. C, almost the same as sun's corona.
    • Copper expands to 67,000 times it's volume when vaporized
    • Oxy-hydrogen flame: 2000 °C or above (3645 °F)
    • Bunsen burner flame: 1,300 to 1,600 °C (2,372 to 2,912 °F)
    • Blow torch flame: 1,300 °C (2,370 °F)
    • candle flame: 1,000 °C (1,830 °F)

      Considering this I don't think 20% containment is impressive, It's a start.

       

      For more info try google: arc flash copper expands when vaporized"

       

      Here are a few links if you can wait:

      http://www.allbusiness.com/manufacturing/plastics-rubber-products/4073821-1.html

      http://www.littelfuse.com/data/en/Arc-Flash_Hazards__Electrical_Safety/LittelfuseArc-FlashTechBrief-PF9801.pdf

      http://www.e-t-c.com/pdfs/Arc%20Flash_web.pdf

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