24-02-2016, 06:09 AM
Which is because its resistance was so high that not enough current would flow to give a quick blow.
Typical radio might take 100 to 200mA. If it takes 10x that under fault conditions a 1A fuse will take a long time to blow. Without the blow time vs current curves to hand I'd guess hours not minutes. I doubt that will protect the main tx.
somebody could do an experiment with a mains tx. Put a shorted turn on it and measure the primary current. Likewise short a heater or ht winding. Obviously only for a second to get the reading. Beyond that you could do a test to destruction and time how long it takes to fail or catch on fire. Obviously some transformers are more fragile than others but this could give an indication.
I don't think any other faults are likely to give enough excess current to even remotely trouble a 1A fuse.
Typical radio might take 100 to 200mA. If it takes 10x that under fault conditions a 1A fuse will take a long time to blow. Without the blow time vs current curves to hand I'd guess hours not minutes. I doubt that will protect the main tx.
somebody could do an experiment with a mains tx. Put a shorted turn on it and measure the primary current. Likewise short a heater or ht winding. Obviously only for a second to get the reading. Beyond that you could do a test to destruction and time how long it takes to fail or catch on fire. Obviously some transformers are more fragile than others but this could give an indication.
I don't think any other faults are likely to give enough excess current to even remotely trouble a 1A fuse.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
