MaxHeadRoom
- Joined Jul 18, 2013
- 28,619
So as I understand it, you have q primary core with the HV secondary wound on top, you also have a second bobbin alongside the first with the other two secondary's??
Yes, correctSo as I understand it, you have q primary core with the HV secondary wound on top, you also have a second bobbin alongside the first with the other two secondary's??
Yes all with that wire ( bundle 9x0.006mm).So was the whole 400 volt winding made of that multi-strand wire? Or just the connections to it?
It got thinner - it was 0.06mm in the first post, ten times as thick.Yes all with that wire ( bundle 9x0.006mm).
cheers
Yes sorry, 0.06mm x 9 in a bunchIt got thinner - it was 0.06mm in the first post, ten times as thick.
Yes it is weird, the fuse def connects between P3 and P4 terminals, P4 is a end wire , not looped !looking at your diagram, I'm kinda doubting a fuse would be in parallel with a winding.
Yes - near enough - 9x0.06mm is the same as 1x0.18mmI need to know if a 0.2mm dia wire is equivelant mm2 to 9 x 0.06mm ( bundled) wires .
What did you get for the mm2 .?Yes - near enough - 9x0.06mm is the same as 1x0.18mm
By the way, in your diagram, which windings were on which section of the bobbin?
Yes I was thinking of not replacing the internal one, it is a thermal fuse though ( 115Deg )!, so might fit one taped to the top and wrapped.I suggest rewinding the transformer without a thermal fuse, unless you enjoy unwinding and rewinding transformers. If you can calculate the power from each winding and then calculate the total power you will be ble to determine the full load current of the transformer, and put a fuse with that rating in series with the primary. That will provide the protection that the thermal fuse was intended to provide and be much more easily replaced. Because it was not intended to be replaced, it is clear that the thermal fuse was not intended to protect the transformer, but rather to prevent a fire if a wrong fuse were used after the correct fuse failed. So using an external fuse of the correct rating will be at least as safe. There is no safety benefit at all from putting in a cheap thermal fuse in the windings.
You have discovered that the fuse failed but the winding was not defective, but it failed, and the transformer was not replacable for any price, while nothing else had failed. So the internal thermal fuse is a cheap substitute for doing the design correctly.
I am very impressed with the ability to unwind a transformer in a way that will allow it to be rewound with the same wire. That requires a great deal of motivation and a fair amount of skill..Yes I was thinking of not replacing the internal one, it is a thermal fuse though ( 115Deg )!, so might fit one taped to the top and wrapped.
Thanks guys for all you inputs on this, you never stop learning and I love a bit of a challenge .
Spike
I detest the embedded thermal fuse in a transformer, it usually saves any over-current/overheat but the transformer is lost, I prefer the replaceable inline fuse of a suitable value.Yes I was thinking of not replacing the internal one, it is a thermal fuse though ( 115Deg )!, so might fit one taped to the top and wrapped.
Thanks guys for all you inputs on this, you never stop learning and I love a bit of a challenge .
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