Balanced vs standard power
Ngjockey - Am assuming you are referring to mechanical noise / 60 hz hum, which is a good point regardless of vendor choice. I.E. something to look out for. I'm not sure why you think an oversized sola ('oversized' per other posts) would not provide excellent stability under dynamic load conditions? |
Wish it were that simple but there's more to those than just a transformer. As part of the ferroresonant design, they are partially saturated at all times. Along the same lines, in regulating voltage, amperage can suffer. So... with a dynamic load, they have to be oversized to a larger factor . While the CVT series has better amperage stability and tighter regulation, they're more like autoformers so noise reduction is one third of the MCR and a true isolation transformer. Don't get me wrong, for decades they have been the 'king of the hill' as far as fast, reliable regulation and only recent, advanced electronic tap switchers can compete for the throne. They're also heavier and expensive, except for that used, $20, 1000W MCR portable I bought once. |
Ngjockey - Thanks for the response. I understand that the sola is not just a transformer:). I'm curious about how incoming line harmonics would compare between a system with electronic tap switchers vs a sola system, maybe not an issue unless the o.p. went with multiple smaller units that could potentially be 'talking' to each other or had other sensitive non-stereo electronics on the same ac line. Perhaps not an issue at all but since the topic is about getting very nit picky with incoming ac it may be a nit worth picking. Oh, for what it is worth I've never seen $20.00 per unit but I think you can find them reconditioned for about 50% price fairly regularly. No response necessary unless the mood strikes you. Just pondering. |
I'm curious about how incoming line harmonics would compare between a system with electronic tap switchers vs a sola system, maybe not an issue unless the o.p. went with multiple smaller units that could potentially be 'talking' to each other or had other sensitive non-stereo electronics on the same ac line. Jeff_jones, Most of the odd harmonics found on the AC mains of our homes is from nonlinear loads connected to the mains within our homes. The home computer being one of the worst. >http://www.pge.com/includes/docs/pdfs/mybusiness/customerservice/energystatus/powerquality/harmonics.pdf >http://www.emersonnetworkpower.co.in/KnowledgeCenter/Whitepapers/K-FactorTransformer.pdf Natan6355 is looking at a K rated 15 KVA transformer. K rated transformers >http://www.powertransformer.us/transformerarticles/transformerkfactorrating.htm JMHO a 15 KVA transformer is overkill. He will have to feed that beast with #3 copper wire connected to a 2 pole 80 amp breaker, minimum, (125% of primary FLA). (240V single phase.) Because there will be next to nothing of a connected load more than likely it will be mechanically noisy and very inefficient..... A power utility pole transformer in older residential neighborhoods that feed 4 or more homes is only a 25 KVA transformer on avg. Pad mounts a 50 KVA on avg. . |
Interesting question about the harmonics. Personally have doubts about any kind of harmonic filtration below 1 KHz for any passive technology, not including regeneration, but I'm not an expert and ferroresonance has it's mysteries. Don't have an oscilloscope to do any testing either. Shared this link before with the caveats of the author affiliation and date. http://www.contractorsav.com/article/2006/11/07/ac-power |
