Re: OT Eurotunnel Problems

On Mon, 21 Dec 2009 10:43:40 +0000, Oz <Oz@xxxxxxxxxxxxx> wrote:

Peter Duncanson <mail@xxxxxxxxxxxxxxxxxx> writes
On Mon, 21 Dec 2009 00:35:28 +0000, Oz <Oz@xxxxxxxxxxxxx> wrote:

More likely a very cold train entered a very warm damp tunnel and the
result was condensation everywhere, particularly internally.

Condensation and high voltage electrics tend to be enlightening.

Particularly in switchgear.

That is exactly what was first suggested by Eurostar.

What seems to have happened is that water was found in the switchgear
(or other electrical bits) of the failed units and that condensation was
guessed to be the cause. The later snow hypothesis comes after a day or
more spent running test trains through France and then through the
tunnel.

This may be a case of "The wrong type of snow" getting through the snow
shields and screens on the power cars.

The snow shields clearly have to also have to control ingress of air
(condensation) or more likely keep the internals at a higher
temperature. Both probably doable by good sealing, keeping the warm (a
powerpack, remember) air in.

There does need to be enough ventilation to stop the motors overheating.
It sounds as though the electrical bits that got damp do not have
adequate independent envirnomental control.

The Eurostar trains have power cars at both ends. I wonder whether one
or both failed in the trains that broke down, and if one, which one.

--
Peter Duncanson, UK
(in uk.business.agriculture)
.

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