nuckolls.bob(at)aeroelect
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 Posted: Mon Aug 13, 2018 8:28 am Post subject: Nanosecond fast circuit protection - for what risk? |
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At 10:34 AM 8/13/2018, you wrote:
| Quote: | Huh! I don’t know what point you are trying to make???
I see you like Mil Specs when you can warp them.
Wasn’t it you that proselytizes with dogma that fuses and CB’s do not protect the avionics, they protect the wires?
So, what is wrong about hoping that someone - hopefully not bogged down with Mil-Specs developed a faster acting CB?  |
For protection against what risk? Those 'warped'
design guides are an encyclopedia of known, quantified,
qualified and ultimately managed risks. "Proselytize"?
Those guides have stood the test of time . . . designing
and testing to those documents has helped produce a constellation
of robust systems and appliances for hundreds of millions
of vehicles.
| Quote: | | I just don't get the point you are trying to make? |
Okay, you want a nanosecond fast breaker? I can design you
one. But it would cost a lot and nobody would want it.
Go study the I(squared)t characteristics of the popular
breakers . . . they are anything BUT nanosecond fast . . .
not even millisecond fast . . . for good and well understood
reasons.
Magnetic breakers are millisecond fast but I've never
seen one employed in a GA aircraft.
There is nothing inherently 'wrong' about hoping for the
next generation of circuit protection to offer further
reductions in risk. But first one must have a qualified
and quantified risk to mitigate.
'Bogged down' in mil-specs? I cannot know your experience
working with those documents . . . I spent a goodly
proportion of my career studying and exploiting the value
of those publications. I'd like to believe that products I designed
nearly 40 years ago, still in service, benefited from that
tribal knowledge. Knowledge offered at virtually no expense to me
but undoubtedly very expensive to those who had to tackle
those risks for the first time.
So the point is: what risk?
Bob . . .
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