On Tue, 1 Jul 2008, John B wrote:

On 1 Jul, 22:01, (Colin Rosenstiel) wrote:

Regen braking has a place here, too, if you can shove the heat from
the necessary resistors outside.

If it's regen braking, rather than rheostatic, the heat goes as energy to
other trains and not into resistors.

Ish. On AC, absolutely right; on DC, you need banks of resistors as well
because putting it back to the grid if there isn't a conveniently placed
train to take it is Too Bloody Hard.

But there are places to send it other than the grid, surely? Supercaps?
Pumped storage? Flywheels? A giant laser firing into space?

tom

--
.... which may end up with the women in your office cornering you at the
office xmas party and taking turns at jamming their bootclad feet into
your genitals. This is what is known as the Wrong Kind of Footsie. --
Lord Foom

In message , at
00:07:52 on Wed, 2 Jul 2008, Tom Anderson
remarked:
on DC, you need banks of resistors as well because putting it back to
the grid if there isn't a conveniently placed train to take it is Too
Bloody Hard.

But there are places to send it other than the grid, surely? Supercaps?
Pumped storage? Flywheels? A giant laser firing into space?

How about a plant that's generating hydrogen by electrolysis. That
wouldn't need a steady flow of current, and could simply absorb whatever
was available from one second to the next. Then use the hydrogen to
power those buses they have. Or did that experiment end now?
--
Roland Perry

On 2 Jul, 10:20, Roland Perry wrote:
wouldn't need a steady flow of current, and could simply absorb whatever
was available from one second to the next. Then use the hydrogen to
power those buses they have. Or did that experiment end now?

For it to be a proper experiment they need some published results.
Haven't seen any yet. More likely it was just green bandwagonning by
Ken.
I haven't seen the buses themselves for a while now but they weren't a
common site in the first place so they could still be bumbling about
somewhere.

B2003