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Same rating for fuses and circuit breakers?

 
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nuckolls.bob(at)aeroelect
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PostPosted: Sat Oct 27, 2018 6:55 am    Post subject: Same rating for fuses and circuit breakers? Reply with quote

At 09:41 AM 10/26/2018, you wrote:
Quote:
At 07:29 PM 10/25/2018, you wrote:
Quote:
Right You Are Charlie:

Here is another thought?
In the AC world there is a thing know as a Ground Fault Interrupt (GFI)

Yup, got 'em in airplanes too. After the Swiss Air 111
disaster there was a push to develop a breaker
with soft-fault detection built in. TI and others
rose to the occasion and you can buy such critters
today . . . if your wallet is fat enough.

Anybody work for Boeing or Airbus? Know anybody
who might fill us in on just how many such devices
have found their way onto there products? I'm
betting its VERY few if any.

Actually, That's wrong. The S.A.111 accident
was precipitated by a 'soft' fault (intermittent
arcing at current level too low to trip breaker,
but releasing LOTS of energy into adjacent
combustibles).

Unlike the hard fault for which the legacy
breakers are designed to clear, soft fault
detection calls for software based monitoring
for a noise signature indicative of the soft
fault. Kinda black magic.

So I'll correct my earlier assertion . . . GFIs
don't exist for aircraft. In fact, they wouldn't
work in a system that specifically uses airframe
ground as the return power path.


Bob . . .


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