Hi to u all,
i want to know about the safest means to test the fuse in the primary windings of a power transformer.by that i mean to blow the fuse by a short circuit and see if it is effective to protect the transformer in case of trouble.the winding impedance measured with a digital meter is approx 72ohms for the primary and 5.6 ohms for the secondary.input and output voltages are220 volts and 19.6volts respectively.please note that i am scared to short 220 volts with a screwdriver even when using protecting gloves so i am eager to hear from you experienced diyers on how to handle that matter.thanks.
i want to know about the safest means to test the fuse in the primary windings of a power transformer.by that i mean to blow the fuse by a short circuit and see if it is effective to protect the transformer in case of trouble.the winding impedance measured with a digital meter is approx 72ohms for the primary and 5.6 ohms for the secondary.input and output voltages are220 volts and 19.6volts respectively.please note that i am scared to short 220 volts with a screwdriver even when using protecting gloves so i am eager to hear from you experienced diyers on how to handle that matter.thanks.
The only fuse blowing test I have seen was a training exercise for engineering students.
Running the fuse a little above its rating and with a stop-watch time it until it blows. Then repeat at a slightly higher current a few more times increasing the current each time.
Then plot a graph and wait for the tutor to mark your work.
Running the fuse a little above its rating and with a stop-watch time it until it blows. Then repeat at a slightly higher current a few more times increasing the current each time.
Then plot a graph and wait for the tutor to mark your work.
Hi Scott,
Hi Refugee1,
-Chris
I'm still pretty sure he was talking about the thermal buried in the windings.i want to know about the safest means to test the fuse in the primary windings of a power transformer.by that i mean to blow the fuse by a short circuit and see if it is effective to protect the transformer in case of trouble.
Hi Refugee1,
A test that should be at least demonstrated for all electronics / electrical students in every starting course! I did that test myself one day when I was bored. Didn't get caught because explaining what I was doing would probably not be believed.The only fuse blowing test I have seen was a training exercise for engineering students.
-Chris
Fuses protect against events which hopefully will never happen. They are a back-stop, and themselves are not entirely reliable. Deliberately creating a fuse-blow event (except for training reasons) is perverse, and shows no understanding of fuses and their purpose.
So whatever you think you need to do, don't do it.
So whatever you think you need to do, don't do it.
at school we were sticking nails into the wall sockets and let a third one drop onto the two between phase and neutral...
Nothing I would do for a DIY-project
blowing that fuse would kill the transformer. However even with a non buried fuse testing ones safety concept means risking the transformer by forcing it into overload and short.I'm still pretty sure he was talking about the thermal buried in the windings.
Nothing I would do for a DIY-project
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Amplifiers
- Power Supplies
- testing power transformer