The Morris battery. Again.

[tony sayer]

Just good Airmanship 'y know:)...

[Andrew]

My cousin had one when she was in the WRAF in 1968.

One day, trying to get up a hill near Brize Norton?, or might have been Bicester.

It couldn't make it to the top unless the rear seat passengers got out and walked to the top.

[news]

This sounds similar to the GT used in the Royal Navy destroyers that broke down when they went in tropical waters, a problem with an inter cooler.

The conversion efficiency was claimed to be better than a diesel at over 50%

AJH

[The Other Mike]

The mention of 'heat recovery plant' would suggest the exact opposite

[The Other Mike]

Rubbing amber on a cat can also equal puncture wounds followed by a course of intravenous antibiotics.

[The Other Mike]

OK rectified when fitted to a vehicle.

In a power station on the end of the alternator opposite from the turbine you'll find a DC field excitation generator / pilot exciter that does have a commutator.

The brushes on those are changed on load (as in hundreds of MW of main alternator load and twirling round at 3000rpm)

Just stand on a carefully tested rubber mat, wear nice clean properly rated rubber gloves and just don't get it wrong. But it's only about 600v or so and there are quite a few brushes in parallel

But if you think that's dodgy they fill the stator with water and circulate hydrogen in the gap between the stator and rotor to keep it cool.

The hydrogen being sealed on the interface between the rotating shaft and the outside world by pressurised oil. Get a rubbing seal and it might ignite the hydrogen make a big bang and the oil fire will burn a very big hole in the roof.

[Johnny B Good]

Well, intravenous is the best way to administer anti-biotic courses of treatment - it reduces unwanted side effects on the gut flora which often makes the cure almost as bad as the disease (or, at best, the lesser of two evils).

[Steve Walker]

No, they were open cycle.

The heat recovery plant merely recovered waste heat from the exhaust for other processes on the rig.

SteveW

[Steve Walker]

Is that a multiple labyrinth seal with an oil seal between sections? That's what we used to use on large axial and centrifugal compressors for flammable gases.

SteveW

[tabbypurr]

what's the uspide of H2 over N2 or burnt air?

NT

[The Other Mike]

About 14 x the specific heat capacity and half the drag

[The Other Mike]

Yes

[tony sayer]

In article , The Other Mike scribeth thus

I suppose thats so it can start up by itself under shudder! Black Start conditions;?..

[The Other Mike]

K rectified when fitted to a vehicle.

Not particularly, by the point you need excitation current at least for a coal /oil / nuclear station you will have been heating the boiler for several hours and the turbine and generator will be at or around full speed and getting ready for synchronisation and load.

For a black start the DC supplies (from batteries) are used to start either diesel generators or distillate fuelled gas turbines. That powers the AC station bus supplies usually at 11kV or 3.3kV, with transformers for 415v and lower supplies. From that point you can operate everything on site such as fans pumps and valves etc.

In normal operation with a live grid the site would take a station transformer backfeed to power everything until the main generator comes on load at which point each individual generator transformer HV side (at 400 or 275kV) then feeds a unit transformer that supplies 11kV to a AC bus for that specific unit. The connection between the common station supply and unit supply is then severed.

There are some variations on this standard configuration at nuclear sites

To cool the rotor and reduce windage losses compared to air cooling

Most large (as in 60MW+) power station generators from the late 50's onwards are hydrogen and water cooled.