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| Re: AMTRAK Service Outage (1633718) | |||
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Re: AMTRAK Service Outage |
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Posted by Stephen Bauman on Sat Jul 6 21:49:57 2024, in response to Re: AMTRAK Service Outage, posted by Jackson Park B Train on Sat Jul 6 21:28:24 2024. The spec for a wire's current capacity is its not heating the wire above 40°C or 104°F. If the wire is insulated, then the heat is less likely to dissipate and the same diameter wire has a lower current capacity than on that is bare. Similarly, a wire in a conduit has lower current carrying capacity than one that is in open air.Next, the catenary between NYP and New Haven is 12.5 KV @ 60 Hz. It's 12.5 KV @ 25 Hz between NYP and Washington and 25KV @ 60 Hz between New Haven and Boston. The resistance of solid wire increases with frequency because of the skin effect. Also, the 12.5 KV lines will draw twice the current and dissipate twice the heat for the same amount of power than 25 KV lines. The stretch between NYP and New Haven has the worst of both worlds: 60 Hz and 12.5 KV. If the breaker were triggered by excess heat, the section between NYP and New Haven is the most likely location to suffer such a failure. |
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