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| Have you/client had a DC arc flash? https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=4537 |
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| Author: | Jim Phillips (brainfiller) [ Sun Jan 21, 2018 10:39 am ] |
| Post subject: | Have you/client had a DC arc flash? |
This is the last question in the series about DC arc flash. Have you/your client ever had a "significant" DC arc flash No Yes – equipment damage Yes – injury Yes - equipment damage and injury *significant refers to equipment damage and/or injury Stories are always welcome. |
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| Author: | bbaumer [ Mon Jan 22, 2018 4:18 am ] |
| Post subject: | Re: Have you/client had a DC arc flash? |
Not that I know of. I've stupidly reconnected the - terminal first on a car battery and then shorted the + terminal to the body via a wrench before. Does that count? |
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| Author: | bbaumer [ Mon Jan 22, 2018 7:31 am ] |
| Post subject: | Re: Have you/client had a DC arc flash? |
Oh, and no injury to speak of other than my pride was a little hurt. |
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| Author: | rmgbob [ Mon Jan 22, 2018 9:49 am ] |
| Post subject: | Re: Have you/client had a DC arc flash? |
The manufacturers technician doing start-up on a newly installed unit set his wrench down across the lugs of the battery breaker. Nothing left of the wrench, equipment damage and soiled pants. |
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| Author: | ivanpulido92 [ Tue Jan 23, 2018 1:20 pm ] |
| Post subject: | Re: Have you/client had a DC arc flash? |
Yes... Once a technician was connecting the battery bank for a solar power plant´s protection system (relays) , then when He tried to make the last connection He shorted all the batteries so it was a pretty good flash. The worker had no injury so, it was an economic experience. |
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| Author: | PaulEngr [ Thu Jan 25, 2018 3:18 pm ] |
| Post subject: | Re: Have you/client had a DC arc flash? |
Isn't half the fun of working on DC flashing over a motor/generator and removing all the hair on your arms? I've seen plenty of "aftermath" and even had a few buddies who got a "summer hair cut" (hair burned off their arms and maybe their face) from flashovers but I have not seen any injuries yet. In the mining industry commonly the largest DC motor they use is a GE MD824 and the associated generator which has a stall current of around 6000 A but at something like 12 VDC, and a name plate voltage of 90 VDC. When it comes to DC generators and motors, it seems like nobody ever wants to take the time to blow the carbon dust out or tries to see how long they can go before something flashes over. It can get ugly but usually the damage is relatively minor. When it comes to DC motors ang generators as far as I've seen the biggest hazard seems to be the danger of failure of the banding on the commutator. When this fails, the commutator flies apart and the level of destruction is scary. A single motor or generator can destroy multiple others around it in a larger MG set. |
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