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Thread ID: 44687	2004-04-27 06:07:00	Its about AC power distribution...	vpothineni (4911)	Press F1

Post ID	Timestamp	Content	User
232450	2004-04-27 06:07:00	Hello, I am doing a project for my university. It is about multi power outlet with timing interval between each power outlet and some more features and stuff. I don't know much..im still researching about the project. I was just wondering if i have say 8 power outlets, can i have reset switches for each of the 8 outlets? (Assuming all running at 230V for example dvd, amplifier, plasma and so on) Reason for reset switches: so that when one of the power outlet is reset, the AC power in the other equipment connected has still power running without interruption. does it make any sense :) or any particular web sites or books i can look into for more info.. thanx a lot.	vpothineni (4911)
232451	2004-04-27 06:30:00	Yes you can. The incoming mains would supply the live side of all the "reset" switches (overcurrent circuit breakers) that feed each outlet. Thats exactly how your main switchboard works. The incoming mains goes through the meter and then supplies all the circuit breakers in parallel. Each circuit breaker supplies one circuit (that could have several plugs on it). When one circuit becomes overloaded, then only that circuit loses power, all the rest stay on. This is mirrored again at the local substation, where the supply for each street is seperately protected by a circuit breaker, so overloading on one street area does not take out the entire region.	godfather (25)
232452	2004-04-27 06:47:00	ok cool..its basically have to be connected in parallel... thanx godfather	vpothineni (4911)
232453	2004-04-27 06:58:00	I'm not sure that the sub can discriminate down to street level Godfather, unless you are referring to the local transformer fuses. It was my understanding the the first level protection was the consumer's pole fuse, second level the transformer fuses , third level local feeder breakers, fourth level substation breakers. Overloading is likely to take out more than one street, as we see when cars bowl poles. Street transformers rarely run anywhere near their maximum ratings and usually blow through internal insulation breakdown rather than external loading, though the latter might hurry things along a bit. Of course I could be wrong here, I'm a little rusty on distribution systems. More to the point though, I was actually wondering if this question might not relate to something more complex than individually switched outlets. The reference to timing threw me a bit and brought to mind the possibility of a bus controlled switching system perhaps, because the basic premise as outlined so far doesn't sound like a University level project. Cheers Billy 8-{)	Billy T (70)
232454	2004-04-27 07:06:00	I was generalising regarding street level, as each substation is designed differently for local conditions. I have designed and installed many... In some cases (smaller streets centrally supplied) it can be on a street by street basis. Often many circuits are needed for just one street, and all manner of combinations within. I was trying to point out that bus supplied circuits with individual protection is the standard method used in NZ. The alternative is ring mains which we do not use. Of course if the overloading takes place far enough back in any such system, the entire bus will be lost. But not the other bus's at that point. I agree re the complexity (or lack of) of the question, but if it was a complex matter one would expect the students would already have a grasp of the basic distribution system.	godfather (25)
232455	2004-04-27 07:09:00	hi there billy T . . . . check out this website . . my project is kindof similar to the on the webpage . . com/power/rps . htm#pd615r" target="_blank">middleatlantic . com and its the last bit one product id = #96-939 and what do you mean by its not a university level project? (easy) :) cheers all . .	vpothineni (4911)
232456	2004-04-27 08:10:00	That's more in line with what I thought Venu, a controlled switching unit for sequential application of power to a range of interdependent devices. That is much more complex, at least the PDS-615R is, the PDS-915R appears to be a straighforward multiple outlet box with integral filtering. This one (middleatlantic.com) is the unit with all the bells and whistles. Cheers Billy 8-{)	Billy T (70)
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