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Railway short-circuit calculation

Railway short-circuit calculation

Railway short-circuit calculation

(OP)
Dear colleagues,

I am in the process of designing the grounding grid of railway substations and prior to that I need the short circuit calculations as it has not been given.

The high-speed ac railway is fed by a two phase, 60 MVA transformer of 400 kV to 2x27,5 kV ucc=10% that supplies energy for up to 12 autotransformer substations, at 10 km of distance of each other. The autotransformers are 15 MVA, 55/27,5 kV ucc=1,2%.

I have done some calculations following IEC 60909 and have some experience using PSS Sincal but I have no experience with railways.

The railway follows the behaviour shown in chapter 20 of the Areva Protection Guide.

Any help would be helpful.

Thanks.

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