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| Re: AMTRAK Service Outage (1633730) | |||
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Re: AMTRAK Service Outage |
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Posted by Stephen Bauman on Sun Jul 7 15:17:55 2024, in response to Re: AMTRAK Service Outage, posted by Orange Blossom Special on Sun Jul 7 13:19:20 2024. They should upgrade to fuses. You just screw and unscrew them.There's a lot more to fuses for high voltage fuses than a piece of copper-tin wire. The dielectric strength of air is about 30KV/cm. Consider a 12.5kv feed. Suppose a current results in melting 0.25 cm (~1/16 inch) of fuse wire. This would result in 12.5 kv spanning a gap of 0.25 cm. The electric field generated would be 12.5Kv/0.25 cm = 50 kv/cm. That's more than air's dielectric strength. The result would be a sustained arc between the gap left by the fuse that would continue supplying current. High voltage circuit breakers are very elaborate devices, with springs to insure against arcing among other things. They are big, heavy and expensive. |
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