ships transformers - Electrician Talk - Professional Electrical Contractors Forum

oceansblue · 06-09-2009, 01:22 PM

Hi guys I bought an ex Royal Navy fleet tender and am a mechanicle engineer so thats why I am so pleased to be on this site as maybe you can answer a few questions. I have learnt you dont require a neutral to run a 3 phase motor but can anyone tell me how the neutral is derived as the 3 phases magically enter the transformer then exit giving me my single phase supply with a neutral even though only the 3 phases are entering the vessel. Like I say I am not really that geared up on the electrics thats why this sort of site is just great for me. Many thanks Chris

Magnettica · 06-09-2009, 01:36 PM

This forum is for professional electricians not amateurs.

MarkyMark · 06-09-2009, 03:39 PM

The neutral is derived by magic.

oceansblue · 06-09-2009, 03:51 PM

Was hoping for a more constructive comment from a more helpfull member of the planet, still its early days yet

oceansblue · 06-09-2009, 03:53 PM

But hey at least Markymark has a sense of humour that I like

brian john · 06-09-2009, 03:57 PM

Unfortunatly from a legal stand point (being we are in America) we cannot give out any electrical information due to possible law suits. And yes we over litigate in the States.

oceansblue · 06-09-2009, 04:04 PM

Thanks for that brianjohn thats a real shame as I thought I was only asking a question that involved the laws of physics and not how to build something that hummed with current, you have some pretty heavy laws in the states then ....

InPhase277 · 06-09-2009, 04:25 PM

Quote:

Originally Posted by oceansblue

Thanks for that brianjohn thats a real shame as I thought I was only asking a question that involved the laws of physics and not how to build something that hummed with current, you have some pretty heavy laws in the states then ....

Yes, our legislation dictates the laws of physics. We have also decreed that pi is equal to exactly 2.

But seriously, most of us here prefer to have amateur questions directed at an amateur site such as http://www.diychatroom.com, as the professionals here like to chat amongst themselves and talk shop.

But I'll indulge, 'cause I'm a super terrific human being... The neutral is simply the center point of the three phases when they are connected together in the shape of a "Y".

gilbequick · 06-09-2009, 05:15 PM

Oceansblue don't take it the wrong way, you're one of the few non-professionals to ask a technical question. Most of the time it's ridiculous DIY stuff. But, this really isn't the best place for you to ask your question. I'd highly recommend the diychatroom.com and check out their electrical section. There, you will get your answer.

BTW good score of the boat, I bet its a pretty nostalgic piece of equiptment.

oceansblue · 06-09-2009, 05:44 PM

Thank you veery much inphase 277 and for your comments gilbequick at least I know why now and am sorry for stumbling on this site that has its group base in the proffesional sector, yes I am only a mechanical marine engineer with basic electrical knowledge that I exercised on Her Majesties nuclear submarines so will now put my membership astern . Thanks again though for those that did help . Take care Chris

oceansblue · 06-09-2009, 06:14 PM

Well tried to unsubscribe but its like the Eagles song Hotel California..." you can check out any time you like but can never leave " So will clean out the Garage and start on my particle accelerator.. Might have a few questions for you lol

Greg · 06-09-2009, 09:16 PM

I shouldn't answer this but the ship does not have a neutral. If it is set up like US Navy ships you have 460VAC and 120VAC. The 120VAC is actually 67.5 VAC on each leg without a neutral and without a ground, a ship is an ungrounded system.

This is coming from a 10 years Navy nuke vet.