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Heat shrink tubes for transformers?
Heat shrink tubes for transformers?
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Old 28th November 2019, 01:16 PM   #1
Elerion is online now Elerion  Spain
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Default Heat shrink tubes for transformers?

Hi everyone.
I recall reading somewhere that heat shrink tubes should not be used as insulation for wire input/output in transformer windings.
I forgot the reason why.



Could anyone refresh my mind or point a reference I can look up?
Thank you.
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Old 28th November 2019, 01:33 PM   #2
FullRangeMan is offline FullRangeMan  Brazil
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Quote:
Originally Posted by Elerion View Post
Hi everyone.
I recall reading somewhere that heat shrink tubes should not be used as insulation for wire input/output in transformer windings.
I forgot the reason why.



Could anyone refresh my mind or point a reference I can look up?
Thank you.
Do you mean say for use the own primary/secondary wires as leads?
It seems a good idea IMO as will be one less connection/solder in the signal path.
Anyway Iam curious for the reason.
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Old 28th November 2019, 01:36 PM   #3
Elerion is online now Elerion  Spain
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Well, it could. But I was talking about the use as insulation for the ends of the enammel wires, from the winding to the place where they are soldered to the output leads.
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Old 28th November 2019, 02:15 PM   #4
FullRangeMan is offline FullRangeMan  Brazil
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For the little I know the leads wires are soldered direct in the primary/secondary winding.
Click the image to open in full size.
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Old 28th November 2019, 02:21 PM   #5
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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I used them in my trafos, with little/no problem, but my doubt is what happen when, supporting trafo's heat, if it degrades chemically, becomes conductive or corrodes enamel.
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Old 28th November 2019, 02:34 PM   #6
FullRangeMan is offline FullRangeMan  Brazil
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Quote:
Originally Posted by Osvaldo de Banfield View Post
I used them in my trafos, with little/no problem, but my doubt is what happen when, supporting trafo's heat, if it degrades chemically, becomes conductive or corrodes enamel.
Do you could post a image of this detail?
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Old 28th November 2019, 03:09 PM   #7
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Unfortunately no of this point exactly, but elsewhere in this site there are pic of my inductors or trafos.
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Old 28th November 2019, 04:50 PM   #8
wg_ski is offline wg_ski  United States
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Originally Posted by Elerion View Post
Well, it could. But I was talking about the use as insulation for the ends of the enammel wires, from the winding to the place where they are soldered to the output leads.
More commonly they use braided non-expandable polyester sleeving for the strain reliefs on toroid trafo leads. I had no problem finding it in Mouser once I figured out how to find it in their database. The silicone-coated version can get expensive but you only need to buy one roll in your career.
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Old 28th November 2019, 11:04 PM   #9
PRR is offline PRR  United States
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To a transformer FACTORY: heat-shrink is an extra step. wg's sleeving is good stuff, and you are going to wind more tape/paper around the whole thing, which will keep the sleeving in place.
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Old 29th November 2019, 03:51 AM   #10
Mark Tillotson is offline Mark Tillotson
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Quote:
Originally Posted by Osvaldo de Banfield View Post
I used them in my trafos, with little/no problem, but my doubt is what happen when, supporting trafo's heat, if it degrades chemically, becomes conductive or corrodes enamel.

Heat shrink is a polyolefin, no corrosive products, but it might split under continous heat as its shrinks further and embrittles/fails. Silicone rubber sleeving may be a more robust alternative, retaining mechanical properties on heating for extended periods. I know large magnetic components (motors/generators/transformers) use materials like Nomex for their insulation, which is mechanically tough and heat resistant. (Nomex is related to kevlar)
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