|21st April 2012, 09:24 AM||#11|
Join Date: Jul 2004
Location: Scottish Borders
Generally we find that the VA rating for a transformer is arrived at using internal temperature as the critical limit.
If the 160VA transformer is an 18+18Vac then the maximum continuous output current is 160 / [18+18] = 4.44Aac. Note AC current rating. This can only happen when the transformer is driving a resistor load.
That 4.44Aac applies to both secondaries individually, unless the specification tells you otherwise.
Some transformers are rated by regulation, rather than temperature. Here one specifies the VA and the regulation, but again that regulation and VA apply only when the load is a resistor.
The input VA will always be higher than the output VA. This is due to the fact that all transformers must have an efficiency <100%.
Assuming the transformer is 95% efficient at maximum power then the input VA will be 160/0.95 = 168.4VA.
The input current when the rated input voltage is 230Vac will be 732mAac
regards Andrew T.
Sent from my desktop computer using a keyboard
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Shanling Cd-S100/ Music Hall 25 (25.2) fluorescent display source?||limono||Parts||2||5th August 2011 01:22 AM|
|500VA 30+30V and 225VA 25+25V toroidal transformers FS||chris-man||Swap Meet||26||14th May 2009 12:12 PM|
|FS Avel Lindberg 250VA 25V+25V Toroidal Transformer||chevy2410||Swap Meet||10||1st March 2009 06:14 AM|
|cheap (230v 50hz) 160va 25+25 tranny on ebay||guitar_joe||Swap Meet||0||24th November 2007 10:53 PM|
|UK: 2 x Encapsulated Toroids 25-0-25v 160VA||ShinOBIWAN||Swap Meet||6||14th February 2006 09:56 AM|
|New To Site?||Need Help?|