On 2022-03-02 20:23:30 +0000, Certes said:

> On 02/03/2022 20:15, Charles Ellson wrote:
>> On Wed, 2 Mar 2022 09:20:19 -0000 (UTC), Muttley@dastardlyhq.com
>> wrote:
>>
>>> On Tue, 1 Mar 2022 20:04:21 -0000 (UTC)
>>> Anna Noyd-Dryver <anna@noyd-dryver.com> wrote:
>>>> <Muttley@dastardlyhq.com> wrote:
>>>>> On Tue, 1 Mar 2022 15:41:49 +0000
>>>>> Graeme Wall <rail@greywall.demon.co.uk> wrote:
>>>>>> <https://www.bbc.co.uk/news/av/uk-england-hampshire-60571022>
>>>>>
>>>>> They might want to think about updating the circuit breaker.
>>>>>
>>>>>
>>>>
>>>> Then it'd probably trip when multiple trains took power at the same time.
>>>
>>> This would have been a dead short from a metal scooter. Plus its probably not
>>> beyond the wit of man for the signalling and power supply to be integrated
>>> so it knows when there's a train there/not there and can trip accordingly.
>>>
>> How much current would a diesel locomotive draw?
>
> Roughly the same as a stopped or coasting EMU.

Coasting or stopped EMUs still have "hotel" loads (lighting, heating/aircon).

Robin

Bob <email@domain.com> wrote:
> Taking an example, a 3x class 450 set, something not uncommon on the
> network, has an installed power of 6 MW, so at full load on 750 V DC
> will draw 8 kA. If a substation has to be able to allow, say, three
> such trains to be in section together (say, somewhere like London
> Bridge, or Clapham Junction), you have a situation where a *normal*
> demand might be 24 kA @ 750 V.

Which makes me wonder: what does the electrical distribution for somewhere
like Clapham Junction look like? Where there could be dozens of trains on
the move at the same time in a small area. At some point can you apply
diversity limits (not all trains will be accelerating together, so adding
another doesn't contribute very much - like domestic cookers are wired based
on 10A + 30% of the remaining load) or is there just a huge amount of
substation plant tucked away across south London?

Theo