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Anonymous Poster

Copper Conductor Discoloring

05/26/2009 1:13 AM

we have the problem of copper discoloring but for electrical wire

Step of process.

1-Drawing wire from 8mm to 1.7mm

2-multi draw of wire from 1.7 to 0.52,0.6,0.72,0.82,1.02mm depend on cable section area.

3-Continues annealing in resistance arc furnace attached with drawing M/C.

4-cooling with emulsion with 0.5:1.5% oil and remaing water

5-online preheating of Copper cable to 90 C

6-insulate the copper conductor with Material XLPE.

7-cooling for insulated cable with normal water .

8-add the insulated cable in sauna with 3 bar and for 4Hr.

9-after check the cable with find the copper conductor discolored.

why coductor color change.?
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sb
Guru

Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#1

Re: Copper conductor discoloring

05/26/2009 2:11 AM

Oxidation. Did you check up any of the conductors without insulating?

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elabd_110
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Join Date: Oct 2006
Posts: 23
#2
In reply to #1

Re: Copper conductor discoloring

05/26/2009 2:16 AM

yes we check conductor with insulation and it is good and also we check conductor insulated with PVC and also the conductor is good

the problem come only when we insulate conductor with XLPE
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sb
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Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#3
In reply to #2

Re: Copper conductor discoloring

05/26/2009 5:46 AM

Not an expert on this sorry, but have heard of some reactions possible while the XLPE polymerises. Let us wait for some expert.

Why didn't you post it in the chemical/ matl science.

Ask Chris leonard and he will divert it there.

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Anonymous Poster
#4

Re: Copper Conductor Discoloring

05/27/2009 4:35 AM

Use an induction heater, encased in a gas tight jacket - with tiny little wire sized holes in the front and back.

Fill it with argon atmosphere.

And allow the wire to "air cool" and chill by running it for a few turns around a big steel wheel - all inside the argon filled chamber.

Argon is also heavier than air so if the whole heater was placed into an argon filled bath with a lid to keep the heated argon in (from the wires) there would be virtually zero argon consumption.
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redfred
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Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15602
Good Answers: 982
#5
In reply to #4

Re: Copper Conductor Discoloring

05/27/2009 10:24 AM

Material science is not my field either, but it might be helpful to know what color or pattern of discoloration you have. To coin a phrase, "a picture could be worth a thousand words."

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