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Forum Index : Windmills : 7 phase Delta
| Author | Message | ||||
herbnz Senior Member  Joined: 18/02/2007 Location: New ZealandPosts: 258 |
re question 7 Phase Delta Glen Theory says you can connect 7 Phase delta for a Sine wave with no harmonics but most harmonics will find the closed circuit a short cct . best like 3 phase use independant unless you want remove harmonics and get better sinewave Below is the Vector diagram phases a to g then adding two together then adding next to resultant of tht and so on finally when all added a = and opposite so cancels out no emf in closed delta . So can do as in three phase  |
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Gill Senior Member Joined: 11/11/2006 Location: AustraliaPosts: 669 |
Herb, This is so when connected A,B,C,D,E,F,G Now try as per my post here Which is A,C,E,G,B,D,F. I guarantee you a surprise.  was working fine... til the smoke got out. Cheers Gill _Cairns, FNQ |
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| herbnz Senior Member Joined: 18/02/2007 Location: New ZealandPosts: 258 |
Hi Gill to close Xmas for challenges, but I could not resist I will try to transfer from cad prog I suspect the suprise is the vector additions give much lower sums ie ratios 2 @ 1.25 & 2 @ .544 for ever second connection wheras 2 @ 2.44 2 @ 1.88 normal These range of voltages could be used to switch in different ratios yet another approach. 
I suspect the image has not come though will print and scan But in both cases you can close the delta the resultant sum is zero. Herb  |
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