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| Re: A new topic for discussion, electrification to Port Jeff and Patchague (1515839) | |||
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Re: A new topic for discussion, electrification to Port Jeff and Patchague |
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Posted by WillD on Sat Jun 15 13:32:23 2019, in response to Re: A new topic for discussion, electrification to Port Jeff and Patchague, posted by Avid Reader on Sat Jun 15 08:26:39 2019. IS a D.C. Catenary less costly to installNot really. The catenary conductors have to be sized larger to handle the increased current draw at the lower voltage. Insulators are comparatively cheap, so it's better to go higher voltage than higher current. More critically DC operation at 600-750vdc requires a million dollar substation roughly every mile. Bumping the voltage up to 1500vdc gets you 3-4 mile spacing, but that's still going to be a killer when doing the nearly 200 route miles left to electrify on the LIRR. Maybe at 3000 volts DC you might begin to become competitive with AC substation placement, but then you're dealing with niche products built for the few countries which have stuck with their old electrification systems. If we're going new-build and don't want to be stuck building a substation every mile or two then high voltage AC is the only way to go. |
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