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Old December 23rd, 2017, 08:19 PM   #721
K_
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Originally Posted by M-NL View Post
It is obviously to late to use this in reality. I wasn't thinking about x000 Hz, but more in the x00 Hz range, for instance the same 400 Hz they use on airplanes.

The purpose of the ABB test was to show that with modern technology the voltage and frequency of the overhead lines do not matter anymore. I don't know if any further equipment was ever built. I guess not, because the railway industry tends to be very conservative.
This is the PETT transformer, currently being tested by SBB. Basically a scaled up wall wart.
With that the tension and frequency of the OHL doesn’t matter anymore. So in the future railways will just choose what is appropriate for a certain line, and all stock will be multi system....
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Old December 23rd, 2017, 08:32 PM   #722
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Originally Posted by The Polman View Post
The Netherlands in first instance has to fix the ridiculously low 1,5kV voltage and go towards 3kV. That is cheaper but gives a very significant advantage over the current low voltage. Overhead wires can remain more or less the same so there will not be an extensive overhaul along the tracks.

Though in new cases and there where the overhead wires reach their maximum lifetime it is of course wise to have all equipment ready for 25kV AC.
Also another problem people are overlooking is that ATB isn't compatible with AC current due to magnetic interference in the ATB system (which was a big problem with railway lines which run parallel next to the HSL zuid).

So to convert all railway lines to 25 kV AC first ERMTS needs to be installed on those railway lines which would increase the cost of a conversion.
With a conversion to 3 kV DC, ATB is still compatible.
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