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Search: Posts Made By: ChristiaanJ
Showing results 1 to 9 of 9
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Forum: Tech Log
21st Jun 2007, 21:46
Replies: 81
Views: 39,694
Posted By ChristiaanJ

People have climbed onto railway carriages, or...

People have climbed onto railway carriages, or goods wagons, with a live 25kV catenary overhead. No need to put out your hand.... the moment you stand upright, it's curtains.
Forum: Tech Log
18th May 2007, 21:58
Replies: 81
Views: 39,694
Posted By ChristiaanJ

west lakes, Epileptic fits are associated with...

west lakes,
Epileptic fits are associated with lower frequencies (several Hz, but not 50Hz). Fluorescent tubes flicker at 100Hz, BTW.

I would think if they indeed used higher frequency AC, it was...
Forum: Tech Log
18th May 2007, 21:20
Replies: 81
Views: 39,694
Posted By ChristiaanJ

The figures I quoted were Holland, not too long...

The figures I quoted were Holland, not too long ago (I'm talking about the 220V, the 127V went out of use in the late sixties.... I think The Hague was about the last town to have it).

UK is...
Forum: Tech Log
18th May 2007, 20:58
Replies: 81
Views: 39,694
Posted By ChristiaanJ

james ozzie, Only a few days ago, a kid got...

james ozzie,
Only a few days ago, a kid got killed here in France, climbing on top of a goods wagon - to recover a football IIRC. Drew an arc from the live 25kV overhead catenary .... Got quite a...
Forum: Tech Log
18th May 2007, 20:11
Replies: 81
Views: 39,694
Posted By ChristiaanJ

IO540 is right....and at voltages below 50V it...

IO540 is right....and at voltages below 50V it becomes difficult to get enough current across a human body to kill, even with wet hands.
IIRC the standard for low-voltage power tools for hazardous...
Forum: Tech Log
18th May 2007, 16:56
Replies: 81
Views: 39,694
Posted By ChristiaanJ

Thanks west lakes, At least the civil aircraft...

Thanks west lakes,
At least the civil aircraft industry ended up standardising largely on 115V 400Hz and 28VDC, unlike the railways, where everybody went their own way.
1.5kV DC, 3kV DC, 750V DC...
Forum: Tech Log
18th May 2007, 16:26
Replies: 81
Views: 39,694
Posted By ChristiaanJ

Rainboe, Good question, and I hope somebody...

Rainboe,
Good question, and I hope somebody well-informed can fill us in on the background.

My first reaction was "weight"....
"Hydraulic" is now a "mature" technology, and you'd need a...
Forum: Tech Log
16th May 2007, 21:56
Replies: 81
Views: 39,694
Posted By ChristiaanJ

barit1,We were talking AC frequency, no? In...

barit1,We were talking AC frequency, no?
In aircraft, where you transmit power only over a couple of hundred feet at the most, the losses in the wiring (skin effect, etc.) are far less significant...
Forum: Tech Log
16th May 2007, 14:19
Replies: 81
Views: 39,694
Posted By ChristiaanJ

Two spots of trivia.... German aircraft in...

Two spots of trivia....

German aircraft in WWII used 500Hz AC systems.
So why do we now use 400Hz? Guess who won the war....

To transport electric power over long distances, the lower the...
Showing results 1 to 9 of 9


 
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