pliances. There's really no upside to a huge voltage change, but lots of co st. "
we need twice the ampacity in the wires.
gh some places did. The old story about the tech with a radio that didn't w ork using a potato to fnds out it was plugged in backwards. I think that wa s England.
ster. It also helped with flicker in lights and TV. Were the phosphors in a 50 Hz TV longer persistence ?
ld be better. Almost everything has a rectifier bridge and a SMPS. They can convert DC lore easily than AC. They don't need those massive transformers because of using a much higher frequency. So back then Tesla was right but today Edison would be right. Go figure. All we would really lose is synchr onous motors.
downsides of dc... more expensive switches, sockets, fusing more danger of electrocution incompatibility with most existing kit sync motors C driven motors dc motors are significantly less reliable no 3 phase distribution
esale from where I worked. It still works but it seems to have a bit less power, maybe it is ready or a cap. Irt also seems not to work at all every once in a while so I bet that triac is on a PC board and it needs to be re soldered. It also needs a new liht. One of these days I will tear it down a nd fix it.
nside of the oven. We simply removed the metal shelf. It was nice to have b ut really we almost never used it. If it didn't have plastic parts I would have saved it for broiling or something on the infrared broiler. Let me tel l you buddy, NOTHING makes meat like an infrared broiler. The only thing be tter is actual charcoal, propane just doesn't hit the spot. The infrared is just as good as the propane. It actually gets hotter unless you have an in frared burner hooked to the propane.
nce, it was much better. It has been good all these year sand finally needs some attention. I think it is worth a new lease on life. If you are famili ar with me you know I loathe to buy new shit, because it is shit. Everythin g is new and improved, that really means less quality resulting in an "impr oved" profit margin for the manufacturer. Everything is junk these days. Do n't even get me started on stereo equipment. The high end got better but co sts $$$, the mid fi we used to buy like Pioneers n shit are all junk now. t he speakers suck, they got no low bass, there are so many "features" it tak es a month to learn how to work it and there ain't much stereo under there. I'll take an old Marantz or something old any day over this shit. And TVs, cars, houses, all just as bad.
he central AC with a cap. Good, because it is an old R22 unit ad you can ha
expensive. I havve no desitre to chsange anything over to R134a because lit tle beknownst to many, it is not as efficient. Butane is much more efficien t but not use for the obvious reason. Ad I still have some R12 in the tank for vintage cars, but it is only for sale at a high price to the chosen few . But I for one, would not like to look under the hood of an old musclecar and see a sticker that reads "R134a CONVERTED". It is just not Kosher.
Nearly all our fridges are isobutane now, and plastic backed. The results a re predictable.
The peak of hifi amps was in the mid to late 60s with the last of the valve stuff. From there it went way downhill.
What he does not seem to get is that while the UK was at 240 and stayed there, continental Europe was at 220 and went to 230. "Supply voltages have stayed the same" that is just WRONG. They went UP, except in the UK where they should have gone down but that did not happen.
True, DC is better today certainly for low voltage low power distribution to households and offices, datacenters etc.
I would not be surprised when we still see a change from 230V AC to something like 325V DC or maybe more. It would facilitate an increase of power distributed to those places over the same cabling, and also improve efficiency.
For long range transmission, you win by going to DC because the corona limit depends on the peak E field and not the RMS.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510
http://electrooptical.net
https://hobbs-eo.com
No, there was never any serious consideration to switching the "grid" to DC, though intergrid ties are DC and there are long-distance DC transmission lines.
The cost of inverters has come way down but they're still more expensive than transformers. Lower loss with long distance or (not quite so long distance) underwater transmission offsets the inverter costs.
** False to say it is much easier.
** The CBD of Sydney, Australia used to be supplied with 240VDC in the early 1920s. It was soon dumped in favour of 240VAC.
High voltage DC supply was just too dam dangerous, a massive fire hazard and highly prone to sustained arcing.
** True and often overlooked. Magnetrons burst into oscillation when a suff icient positive supply is applied to the anode. Having no control grids, it is by default a vacuum diode.
In operation, current flows during alternate half cycles from the transform er into the high voltage capacitor followed by the capacitor PLUS magnetron in series.
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The approx 1uF film cap does three crucial jobs, it doubles the peak supply voltage available from the transformer, provides a matching load during ha lf cycles when the magnetron is off and prevents any DC component forming i n the transformers secondary current.
If one examines the AC supply draw of a typical microwave oven, it is close to a sine wave, with low phase shift compared to the voltage. So the PF is good.
The film capacitors value is critical to keeping good balance of alternate half wave currents while transformer leakage inductance plays a role as wel l.
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