Peter The star distribution with the center point neutral runs from the distribution grid substation to the facility. So the utility company provides the consumer with the four wires, which they then distribute as required.
In a residential area, the three phases are split every third house, providing each residence with a single phase and a neutral. The logic here is that if one phase fails, the whole street is not plunged into darkness. A very good handbook I recommend is "World Electricity Supplies" published by BSi Standards. Covers all the worlds distribution voltages up to 22kV grid level. Plus shows you what phase configuration is used by the generator to distribute the power. Peter Tarver wrote: > Andrew - > > Please clarify something for me. Is the utility > distribution star configured (WYE connected), rather than > DELTA? Or are you speaking only wrt typical distribution > within a building? (In the US, "distribution" is generally > used to reference utility power distribution, for instance, > "distribution transformer," as opposed to "facility > transformer.") > > I ask because DELTA is used by utilities in the US and > Canada to simplify connections save the unnecessary cost of > running a Neutral (star reference point conductor) between > distribution transformers (or so it was 'splained to me, > Lucy). > > Regards, > > Peter L. Tarver, PE > Product Safety Manager > Sanmina-SCI Homologation Services > peter.tar...@sanmina-sci.com > > > From: Andrew Carson > > > > Terry > > > > Then nominal EU phase to phase voltage is 400VAC > > with a +6/-10% Tolerance. Distribution is Three > > Phase Star, Earthed Neutral. > > > > Snip < > > > > Andrew Carson - Senior Compliance Engineer, Xyratex, UK > > Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 -- Andrew Carson - Senior Compliance Engineer, Xyratex, UK Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
