nuckolls.bob(at)aeroelect
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 Posted: Wed Nov 23, 2022 8:54 am Post subject: Fusible Link Performance vs ANL Current Limiters |
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At 07:52 AM 11/23/2022, you wrote:
| Quote: | --> AeroElectric-List message posted by: "rockitdoc" <scott.shuler(at)colostate.edu>
I read a good review of this but cannot find it anywhere. Can somebody lead me to it. The discussion regarded why the fusible link was a better method than the ANL for electrical protection near the alternators. |
'Better' is not a very quantifiable term when applied
out of context. The design goal calls for reduction of
risk to certain conductors in the system against hazardous
fault currents. How much current? In this case, a battery
feed fault with a potential for hundreds of amps
for an extended period of time. Precipitating event?
Destruction of semiconductor devices in (1) output of
alternator or (2) rectifier regulator.
Options? Fuses, circuit breakers, current limiters, fusible
link, etc.
With respect to functionality, ANY of these would serve
just fine. Design goals? Hmmmm . . . ease of installation,
reduction of weight, minimum cost, attractive service life,
or any combination of these.
Fuses, current limiters, breakers have significant costs
for procurement and installation. They may also feature
threaded fasteners which adds to complexity and risk of
loss of integrity due to environmental effects or deficiencies
in craftsmanship.
The lightest and lowest parts count approach is the fusible
link. Tooling and skills are no greater than required
for all other wires and terminals in the system. So unless
constrained by other design goals favoring alternatives,
I suggest that fusible links are the elegant solution to
a VERY LOW RISK problem.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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