On 13/07/2018 10:27, Roland Perry wrote:
In message , at 08:57:53 on Fri, 13
Jul 2018, John Williamson remarked:

Not even a quarter of a Eurostar. They draw 16 megawatts flat out.

Only on 25kV, look again at its consumption on DC, and it's the amps I'm
highlighting anyway.

The lower power and speed restrictions on the third rail sections of the
original route was a deliberate restriction to prevent overload damage
to the ageing trackside equipment and speed related damage to the
collection shoes. As the third rail shoes have now been removed, this is
academic. They used to jog along at 65mph in the UK. accelerate to 85
mph or so for the tunnel, and then to full speed for the French and
other parts of the trip. They now do full speed along the HS1 track,
slow down to 85 for the tunnel, then accelerate again as they leave it.

The traction motors on a Eurostar are rated to draw 12 megawatts per
train at start, the garage is drawing a fraction of that. The 12
Eurostar motors are likely running at 600 volts or so, which means they
draw about 1,600 Amps each, at a megawatt a pop, but this is only of
concern to the designers and engineers. To everyone else, it's a black
box system that needs a megawatt per motor at whatever voltage and
frequency the pantograph is supplying at the time.

What's important to the grid is the input. Your 6,250 Amps for the
chargers will be split into chunks of about 200 Amps per bus (at about
600 volts, IIRC), by the distribution network. It will come into the
site at about 120 Amps per feed at 11kv.

--
Tciao for Now!

John.