Railway phase-earth short-circuit

[radug]

Hello,

I am designing the grounding grid for high-speed railway substations and autotransformers (-27,5 kV and +27,5 kV) and I have not been able to find any good references for short-circuit calculations. I need to calculate the phase to earth short-circuit both in substations and in autotransformers, and also the part of that fault which returns.

Could anyone provide me references for this type of calculations, please?

Thanks.

 

[Marmite]

Chapter 20 of the Areva NPAG "Protection of AC Electrified Railways" may be of use.
ftp://ftp.areva-td.com/NPAG/Chap20-352-369.pdf

Regards
Marmite

 

[Marmite]

For some reason that link I posted doesn't work when cut & pasted. You can get to it from

http://www.areva-td.com,

and search for railway. It will appear in the results and opens up fine.

Regards
Marmite

 

[lz5pl]

AREVA changed the way of downloading from their web-site. It is free again, but they require filling-up of Contact Form. If you like, proceed this way. If not - I have NRAG and as it was available for free download, I don't think it will be a violation of copyrights to post the railway section here:


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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant

 

[radug]

Thank you,

I already read AREVA guide before asking. A good reference mainly for protection issues. But it was not very helpful with short-circuit calculation.

 

[radug]

Another question:

In EN 50122-1 there is data for the rail conductivity: from 0,4 Siemens/km to 1,7 Siemens/km. When calculating the different return paths of a ground fault, how can be determined the part which returns from the rails? How much distance must be considered?