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If you have a question regarding coaxial, telephone, and building wire, power cable, insulation, extrusion, bunching, stranding, braiding, etc. post it here.

TOPIC: Insulation of enameled copper wire

Re: Insulation of enameled copper wire 2 years 7 months ago #775

I was afraid I had left out the important phrase "oil filled transformer"

If there are defects in the surface or insulation it does not matter much unless they are adjacent to each other or in direct contact. Since the transformer is then filled with "transformer oil" which does not conduct electricity, it "corrects the problems" so to speak.


Sorry for slang language, etc.
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Re: Insulation of enameled copper wire 2 years 7 months ago #776

spectre
if the cracks are not in contact and if is paper wrapped on each layer of wire, and filed with oil...than the transformer will be OK?????
But you know about the test of breakdown voltage in WATER? Testing of an enamel led wire in water..same length like in balls bath. My question is: When I test a wire (round) the breakdown voltage value is ..let's say 7 kV and after flattening of the same type of wire from the same spool the value of breakdown voltage is 4,2 kV. But according requirements the value of breakdown voltage for flattened wire must be with max. 30 % lower from the value of breakdown voltage for round wire. What I have to do to increase the breakdown voltage for flattened wire?...Please don't tell me to decrease the breakdown voltage of round wire
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Re: Insulation of enameled copper wire 2 years 7 months ago #777

Hi there tech1

Nice to have you back! Welcome!

You are of course right about the hijacking of this thread but since the title of the thread is the "Insulation of Enameled Copper Wire" it all seems to be working out properly.

If it had been some subject completely separate from magnet wire, I would have started the new thread myself and moved those posts over just as I have done previously on occasion.

Regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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Re: Insulation of enameled copper wire 2 years 7 months ago #780

Hello Raul,

What you are suggesting is very absurd. This web site is a forum for experienced or new wire and cable people so that they can discuss various technical problems and solutions.

The web site is not here to train people or to provide people worldwide with free detailed processing instructions, machine information and drawings; all for download.

Your machine suppliers and other process consultants provide such information generally on site or at seminars, but usually not for free. We are not in competition with these people and companies or with commercially available books on these subjects.

I trust you understand.

Kindest regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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Re: Insulation of enameled copper wire 2 years 7 months ago #779

Guys,
How absurd is the idea to create a website with PICTURES and PDF documents with more detailed answers for this INDUSTRY????????
Raul
Last Edit: 2 years 4 months ago by Archived Forum Admin.
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Re: Insulation of enameled copper wire 2 years 7 months ago #781

Peter,
good reply. I started to make one like Rapier or Zorro used to make a couple of years ago but deferred.

I beleive that the "water test" originated in Japan. I think you make a coil similar to a heat shock coil but around a 3 or 4x mandrel and then while coil is submerged, pass a current through it. Where bubbles form on the coil indicates defects in the insulation.

I am not surprised aat all that the flaattened wire gets a lower value; you stress the insulation when you flatten the wire.

I pretty sure if you coated a flattened wire, you would get a higher breakdown voltage value. This is because the integrity of the insulation is about the same as it would be for an insulated round wire.

RB
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