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Tool Talk Discussion Forum

Re: Basic AC Power Systems

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DH in Carolina

04-22-2013 15:55:14
173.212.15.114



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What about a zig/zag transformer system to get a neutral from a ungrounded three phase system. I have only did one of these years ago in a plant using three single phase transformers. DH




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David G

04-22-2013 17:10:22
205.215.206.18



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 Re: Basic AC Power Systems in reply to DH in Carolina, 04-22-2013 15:55:14  
That would probably be a delta wye transformer with the center tap of the wye grounded.



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John T

04-22-2013 17:10:16
216.249.82.117



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 Re: Basic AC Power Systems in reply to DH in Carolina, 04-22-2013 15:55:14  
In all the Industry I worked in we didnt use what you mentioned or any open delta etc. However I did design the first Corner Grounded Delta ever used at our large Navy complex and the electricians got all excited tellin me one phase was dead since it measured 0 volts to which I responed YES IT BETTER because its dead grounded in that one corner !!!!

Fun chattin with ya

John T



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george md

04-22-2013 21:24:37
209.213.167.201



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 Re: Basic AC Power Systems in reply to John T, 04-22-2013 17:10:16  
John,

I ran into one of those systems in a small
commercial garage in Aberdeen md. 3 wires in what looked like a single phase breaker box,
2 wires on the normally hot posts ,the third
on the neutral . measured 240 across any two. Thought this is odd, followed the service cable (2wire with wraped neutral) outside, it's connected to a triplex (2 insulated and a bare neutral), followed it several pole spans down the street to a pole with 3 small transformers. That was the first I had seen that ,and I don't remember that set up from college.

george

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John T

04-23-2013 05:33:36
216.249.82.117



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 Re: Basic AC Power Systems in reply to george md, 04-22-2013 21:24:37  
In college we didnt get into corner grounded Deltas, thats something I discovered years later and based on my preference for a grounded versus a floating system.

Fun chat

John T



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David G

04-22-2013 17:11:16
205.215.206.18



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 Re: Basic AC Power Systems in reply to John T, 04-22-2013 17:10:16  
There was a lot of ungrounded delta put in industrial plants in the 50s. Most of it has been replaced.



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John T

04-23-2013 05:36:24
216.249.82.117



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 Re: Basic AC Power Systems in reply to David G, 04-22-2013 17:11:16  
TRUE even in the 30's through the 60's many industrical plants used non grounded straight Delta but that has went out of favor for the same reasons I didnt like it either, I just preferred grounded systems and still do.

Fun chat

John T



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David G

04-23-2013 06:03:09
205.215.206.18



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 Re: Basic AC Power Systems in reply to John T, 04-23-2013 05:36:24  
I think it was about the time distribution changed from 2400 delta to 12477 or 4160 Wye. There is still a little 2400 around here in the smaller communities.



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