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Re: [TCML] 60/50Hz Tesla Coil? - Non disruptive
Gary Peterson wrote:
Regarding power distribution frequencies, in addition to 50 and 60 Hz,
400 Hz is used by the military in some shipboard systems and in
aircraft. RF power distribution systems in the 20-40 kHz region have
also been suggested. I believe that NASA has explored this.
I doubt anybody is contemplating multi kHz power distribution on
spacecraft these days. In a DC/DC power converter sure, but there's too
many things that are sensitive to EMI that it's just not practical with
current technology (e.g. contemplate how much filtering you'd need to
reduce the harmonic content down to, say, -150dBm)
However, we do use 120VDC on ISS for power distribution. Lots of
commercial spacecraft use bus voltages of 60-70-80VDC. 28V is popular
because there's an enormous amount of stuff that takes 28V. 50V is used
on larger Japanese spacecraft.
Spacecraft electronics has to be designed to tolerate big transients
(e.g. twice the line voltage) and to use components rated 2,3 or 4 times
the working voltage (e.g. no using a 50V electrolytic capacitor in a EMI
filter on a 28V bus)
On a related topic, is anyone aware of any statistical studies having
been done on the physiological and neurological effects of long-term
exposure to the electric and magnetic field energy associated with Tesla
coils?.
I don't know of any off hand, but if you look in ANSI/IEEE C95.1 (the
RF exposure standard) there's dozens of pages of references for just
about every study known.
You might look for studies related to ELF and VLF transmitting stations
(e.g. Omega, Loran, submarine comms). I know there's quite a bit of
literature out there on these things: they're so huge that you have to
file an environmental impact report to build one, and that EIR will
include data about electrical and magnetic field effects.
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