--- In [EMAIL PROTECTED], Andy Wander <[EMAIL PROTECTED]> wrote: > Yeah, but.... > > I still say that the thing that limits the secondary current is the wire > gauge used for the secondary winding. > > I don't think many transformers are built using wire that's a lot heavier > than needing fro rated output current. Therefore, dropping the primary > voltage(thereby dropping the secondary voltage) doesn't mean you can now > pump more current through it to "get back" up to the VA rating. > > Andy Wander > Verrex Corporation >
Hi Andy, You are exactly correct in that the wires in a tranformer are exactly the correct size for the maximum of the transformer. But heat the real limiting factor. too small a wire, and they overheat and short out. The transformer houses pay engineers to design these things and not add extra copper for the fun of it. Imagine the cost of adding a useless extra pound per transformer. But, as Jon had said, you can connect these things for maximum power or what much reduced power you need. Since I'm looking at a 21 amp 48 volt supply, that could be a single 48 volt transformer. As was said, if I am lighing 24 volt DC lignts on a 2 diode rectifier, then the transformer will only send power at 1/2 cycles and run much cooler. In this case, the transformers I am looking into are listed as having a higher rating with a choke input filter than with a capacitor one. What I am learning from this thread is that transformers are not always selected without design calculations. Darn, life was so much easier when I thought I knew everything but really knew very little. Dave Addresses: FAQ: http://www.ktmarketing.com/faq.html FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/ Post Messages: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] List owner: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] Moderator: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] [Moderators] URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO OFF Topic POSTS: General Machining If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. http://www.metalworking.com/news_servers.html http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
