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| Running an US Fridge Compressor in Europe? |
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| babysitter:
Which was a financial thing of "unwilling to supply", I'd say grid robustness made that it only slowed the clock and didn't make the grid break into two or more parts and rolling blackouts. |
| alpher:
Let me elaborate then, "a few of kiloamps" is actually a very weak network, Minimum for any kind of dwelling should be arround , 20Ka, most of Ontario area being in 200Ka range for most of commercial and some of residential dwelling, and some unfortunate souls being close to the transformer even higher (which cost serious money). Don't wan't to start a pissisng mach but the relative absence of star/delta starters so common in Europe speaks for itself. I've never seen one used on a motor of less that 150Hp. |
| james_s:
Well UK is the closest to Europe I've been, but the arrangement at least where my friend lives is a bit different. One transformer stepping down to 240V feeds the whole street he's on, so especially near the end of the run the voltage range is pretty wide. He was monitoring his for a while and we saw everything from a low of about 220V up to a high of over 250V. I monitored mine and never saw it outside a range of 118V to a high of 121V, the standard setup here is a transformer either on a pole or a vault by the edge of the road that steps down 7200V to 120/240 feeding only a few houses within a couple hundred feet of the transformer. Even so, that's not going to cause any trouble starting a refrigerator motor. Most stuff isn't going to mind a slightly wider voltage swing. |
| Monkeh:
--- Quote from: alpher on October 13, 2018, 02:39:13 am ---Let me elaborate then, "a few of kiloamps" is actually a very weak network, Minimum for any kind of dwelling should be arround , 20Ka, most of Ontario area being in 200Ka range for most of commercial and some of residential dwelling, and some unfortunate souls being close to the transformer even higher (which cost serious money). Don't wan't to start a pissisng mach but the relative absence of star/delta starters so common in Europe speaks for itself. I've never seen one used on a motor of less that 150Hp. --- End quote --- I'm sorry, what? No normal residential installation can handle a 200kA fault current. Hell, most decent size industrial ones can't. And you're going to have one hell of a time achieving that with 120V! 20kA is already very substantial. 20kA at 240V would require an EFLI of just 12mΩ - with 4AWG conductors that's only 7.5m of cable. 200kA would involve just 1.2mΩ - that's about 3m at 0000AWG. Would you like to try again with your brain engaged?! |
| NiHaoMike:
Be on the lookout for a small used VFD and that should do the trick. Too bad it's not the reverse (run a small 240V compressor on 120V) since there's a fairly simple solid state converter for that. Basically just rectify the mains with a voltage doubler and switch a pair of MOSFETs such that it generates 120V AC of the opposite phase, which then is combined with the incoming 120V to make 240V. |
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