| Electronics > Beginners |
| Isolation transformer with a high voltage winding... how to handle it? |
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| mlefe:
I'm pretty sure that it was wired as an autotransformer, but I've separated the neutrals... so I guess it became isolated? I tend to think that it's like Arthur is saying (the 770V is the original 110V) although I still haven't put together the test to see if the winding for the new primary/secondary will work or simply doesn't have enough turns to avoid saturation (I've been reading a bit on this) What I can say is that I can measure the resistance and inductance because, believe it or not, I've purchased a functional HP 4261A for only 17USD!! I must learn how to use it, of course, but I believe that knowing the inductance should help to see if it saturates with 110V? (perhaps I can put a rough model in LTSpice?) I still didn't create the test with the light bulb because I wanted to create a box for the variac I've also purchased and use that to slowly ramp-up the voltage while measuring the current... also I don't have a lightbulb (can you imagine that? I have a 4261A and don't have knowledge nor light bulbs... I know, life is very unfair sometimes!) :-DD |
| mlefe:
Hi guys, as you have suspected, this was a transformer with windings that were only able to provide less voltage than what the primary has (+-10%) and thus, once I tried to energize those windings with my variac, quickly saturated the core and the current went to the roof. I've put some different resistances in series but in the end, I've realized that they will have to be huge and dissipate lots of power to have a usable 5A transformer. In any case, despite the failure I've learned a lot and that's what this is all about for me :-+ Thank you for your comments! |
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