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Registered Member #3925
Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121
hey,
i applied a high frequency square wave to a mains transformer, and the voltage was so high that the insulation in the secondary failed, will the transformer still work at mains voltage?
Registered Member #2727
Joined: Tue Mar 09 2010, 02:39PM
Location: Montevideo - Uruguay
Posts: 33
If you have a visible carbonized isolation, keep it out, place a substitute for it, and try to energize the transformer in series with a resistor, like an electric heater that support your mains voltage. Then you will see if it work or the heater work :)
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Perhaps you should be asking if the transformer is still safe, and you should assume that it is not unless there is very strong evidence to the contrary.
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
alf wrote ...
hey,
i applied a high frequency square wave to a mains transformer, and the voltage was so high that the insulation in the secondary failed, will the transformer still work at mains voltage?
thx. Alf.
Depending on HOW the insulation failed, you may be able to repair it. Arcing normally burns insulation, resulting in a black carbon burn spot that will be conductive at high voltage. If that burnt spot is visible, and if you can clean it off by scraping with a knife blade, then you may be able to save it. But if the burn occured between the windings, or between a winding and the metal core, then you may not be able to do much to repair it.
You said nothing about the TYPE of transformer. If it has a low voltage secondary (for example, 6 VAC or 12 VAC) then you probably don't need to worry about a burn mark unless it actually caused a short between windings. But if the transformer has a high voltage secondary winding, then you definitely must make certain that there are no carbon deposits or burn marks on insulators or wire covers, etc.
Registered Member #3925
Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121
Xray wrote ...
alf wrote ...
hey,
i applied a high frequency square wave to a mains transformer, and the voltage was so high that the insulation in the secondary failed, will the transformer still work at mains voltage?
thx. Alf.
Depending on HOW the insulation failed, you may be able to repair it. Arcing normally burns insulation, resulting in a black carbon burn spot that will be conductive at high voltage. If that burnt spot is visible, and if you can clean it off by scraping with a knife blade, then you may be able to save it. But if the burn occured between the windings, or between a winding and the metal core, then you may not be able to do much to repair it.
You said nothing about the TYPE of transformer. If it has a low voltage secondary (for example, 6 VAC or 12 VAC) then you probably don't need to worry about a burn mark unless it actually caused a short between windings. But if the transformer has a high voltage secondary winding, then you definitely must make certain that there are no carbon deposits or burn marks on insulators or wire covers, etc.
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insulation failed on mains transformer, will the xfmr still work?
