Transformer getting hot?
I got a transformer today. I want to use it to wire old relays/contactors. They need 80V direct current. I supplied the transformer with 230V and 80V comes out of the other end. However, the transformer gets hot within seconds, even when nothing is connected. You can't touch it anymore and it sounds really interesting when you do. It could be the glue though. Why is that? Unfortunately, you can no longer read any data on the type plate. The only thing that is easy to see is that it is built for 50 Hz. So the transformer gets hot when a contactor is connected to it, but also when nothing is connected. The transformer has two secondary windings. Does anyone know what's going wrong here? I don't have a multimeter handy. But I think 80V is still coming out because I don't think the contactor could have handled much more than that.
Here I have measured the resistance now
Here is the primary winding
Then the secondary winding 1
And the second winding which is connected in series
(No Ratings Yet)
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It is difficult to tell impossible what the problem is. You know what this is? Do you know how the connections are connected? (2 secondary windings could also stand for 2x115V or 1x230V…)… You don’t know how much tension comes out, you just guess… that doesn’t make any meaningful prediction.
How did you turn the exit? Do you have a rectifier circuit on it, etc? Because you wrote something of 80V DC at the beginning.
So the transformer has a primary winding where 220V comes in. Then two secondary windings come out where 80V and still something unknown is to come out. Measured through the primary winding and got only a few kOhm out as a resistor. There was only a rectifier circuit at the output. The rectifier circuit consists of two single-use rectifiers which reach up to 250V. Once 250V and at the other end there was also a DC voltage.
When a transformer gets hot in idle, it has a winding closure and thus defective. You can dispose of it…
have a multimeter now at hand and from the values I also suspect a winding closure in the primary winding
How can you know what tension comes out if you don’t have a measuring device?
A guess alone is not sufficient as a measurement result.
You should also be aware that an AC voltage of 80 V is already life-threatening.
Either you have incorrectly connected the transformer or it is defective.
And another thing:
To obtain a rectified voltage of 80 V,
the transformer must have an alternating voltage of approx. 57,5 V at the exit.
At 80 V~ you have around 112 V behind the equation.
I suspect this tension because the shooter was also operated with 80V for years on the transformer.
If nix is connected and we are still hot, it’s a wrap.
Part defect
Other
OK.
Then please explain why 80V will come out on the other. Just ask him then I learn to do it. Never worked with transformers 👍
Send him back!
If a transformer gets so hot without load that you can touch it no matter what it is.