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~100 VA looks about right for the physical size of the transformer.I suspect a typo. Secondaty should probaly read 90 VA, not 490.
&%¤#"!/ Imperial units.The tape measure threw me off.
Size lines up with whatever Hammond 1kVA toroid google found me.Ohm it out? If I'm thinking right with it being near 1:1 it should have a near 1:1 turns ratio with near 1:1 resistance if wound with the same gauge wire.
I physically do not have it yet as I just bought it off eBay this morning. I'm hoping it's 980VA. I'll ohm it out and load test it when I get it. I was wondering if the 103VA was some special non-standard application. Must be an error
Quote from: x86guru on March 19, 2024, 08:58:17 pmI physically do not have it yet as I just bought it off eBay this morning. I'm hoping it's 980VA. I'll ohm it out and load test it when I get it. I was wondering if the 103VA was some special non-standard application. Must be an errorIts not an error. The rating beside the primary winding is probably magnetization current (no load current), 103VA = 1.2A.The load rating is definitely 490VA*2.Which matches up with this post here: https://www.eevblog.com/forum/beginners/transformer-idle-consumption/
Thanks, that makes sense. Except, @120v, wouldn't 103VA be 820mA?
Oh Lee Crap! Is this amateur's half-hour?It's using the same nomenclature as is used for resistors. \$103 = 1.0 \times 10^3\$, i.e. 1kVa. Which is congruent with its physical size!
What is it, AA59902055?https://hubbellcdn.com/ohwassets/HCI/Acme_Electric/Literature/SECTION-10.pdf...It's less likely to find standard parts among transformers, I mean customs are pretty common, but these ratings look standard enough. Might get lucky with a search Don't see anything in there about primary VA though. Seems a strange way to mark it, if it's magnetization. If in doubt, I'd e-mail them.Tim
Yeah I'm probably wrong looking at it again, I see some on ebay where they listed both primary and secondary VA: https://www.ebay.ca/itm/282019280411 (pri 665VA sec 625VA)https://www.ebay.ca/itm/166566676953 (pri 495VA sec 480VA).So either 1030VA or 1003VA would be the number if that is the case.Which would give you an idea of the efficiency?