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| Isolation transformer, wiring question |
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| cs.dk:
Would it be OK, with a 5A fuse on the output to protect the transformer from overload, and then a larger ie. 10A on the input in case the transformer shorts out? Or it that bad practise? |
| ArthurDent:
With a 1:1 transformer any current in the secondary will be the same (actually slightly greater) in the primary. Because of inefficiency if there is a 5A load on the secondary of the transformer there will be perhaps 5.2A flowing through the primary. A single 5A fuse on the primary should be all you need but this fuse will be for over current and not serve the same function as the open thermal fuse that is now bypassed. As I mentioned before I would get a new thermal fuse and wire it in place of the jumpered leads. It can be epoxyed in the center of the toroidal transformer and will sense the heat the same as the original thermal fuse. Any regular fuse you put in the primary side should never be greater than the transformer current rating. |
| cs.dk:
Thanks - I'll get a fuse in there again :) |
| cs.dk:
So, had to use the transformer today.. Installed a fusesocket long time ago, and put it away with the box closed.. No output :o Hmm, open it again - Forgot to join the two wires :palm: But now i know why the soldering looks like it did. The yellow wire is enamelled, and it was quite hard to get rid of. I did though that soldering iron temps would melt it, but no. How ever, it works again - Only annoying thing is the mains hum. I'm surprised it's so noisy. |
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