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| Re: PHOTOS: CALTRAN CALTRAIN VII (1544623) | |||
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Re: PHOTOS: CALTRAN CALTRAIN VII |
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Posted by Bill West on Sun Apr 26 14:06:12 2020, in response to Re: PHOTOS: CALTRAN CALTRAIN VII, posted by nasadowsk on Sun Apr 26 13:06:49 2020. Hi Phil, regarding 25 vs 60hz, this was discussed on RRnet a decade ago.-There is little difference in the EMU cost because it's all custom parts or frequency insensitive parts anyway. -The 70's paper wasn't 25hz's PF it was 60hz's impedance, it has 2.4 times the voltage drop. MNR had to add substations on the New Haven line. That's the cost that would pay for frequency changers. Then you can keep the whole system on one phase and skip the open phase breaks then the onboard switching that goes with them. -For direct connection of RR single phase to 60hz utilities the UK bs'd the utilities "out of the water". Amtrak Boston gets along because it is so lightly loaded that the Utility can stand the unbalance. The catch with that thought is that it could be used by other customers and eventually dirty up the network. -25kv DC is what would work the best all round but no one would pursue it. I acknowledge that any new RR will be 60hz but it will be by steam rollering the arguments, not by answering them. Just wanting to keep the record complete, Bill |
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