- About me
- A university trained Professional Mechanical Engineer, registered in the Province of Ontario, Canada.
A wire and cable manufacturing engineering specialist with over 35 years hands on experience.
- Dear Zamiur
This is an all aluminum alloy stranded conductor (AAC) with a construction of 7 - 3 mm wires preasumably in a 6+1 configuration.
From IEEE Explore Digital Library ( ieeexplore.ieee.org/document/368373/ )
Conductors utilizing the new high conductivity medium strength aluminum alloy type 1120 have been used for transmission and distribution lines in Australia since 1984. Unlike traditional aluminum alloys such as 6201 and 5005 the 50% increase in strength of alloy 1120 over standard EC grade aluminum is accompanied by only a slight reduction in conductivity. Overhead line conductors using this alloy provide lower IR losses without appreciable capital cost penalty. Introduction of these new alloy conductors provides a significant development in transmission line technology. This paper traces the introduction of this alloy in Australia, the development and testing of conductor, together with details of its application by one major utility."
I noted that the above paper was presented by Olex Cables Limited in Australia which is now Nexans Olex.
Unfortunately you have asked me two questions that I cannot answer as:
I have no experience with your 1120 Aluminum alloy and I cannot find any pertinent information to pass on to you.
I have never tried to anneal a stranded aluminum cable. We always annealed the individual wires in a properly designed and built annealing oven.
So you see, I have really nothing to tell you. Sorry about that.
- Hi Frank,
It looks like nobody is going to quickly respond to this thread but since you have a lot of resources at your disposal, here are my suggestions:
- Graph the ultimate tensile strength (UTS) of the 32 AWG wire or metric equivalent up to failure and the elongation.
- Determine the elastic strength of the wire and with your experience with other metals and determine the maximum elastic force you can impart to each wire.
- Knowing the number of wires on each carrier, calculate the maximum and minimum wire-set forces on each carrier. (Remember that the tension goes up as the diameter of the wire set reduces. - Constant torque.)
- For lubrication, I would recommend the use a very light oil that doesn't promote environmental stress cracking. Talk to your lubricant supplier or manufacturer. Do not over lubricate.
- For a start, the braiding closing die should be very similar to a copper braiding closing die. Some experimentation may be necessary.
- Verify your results by experimentation.
- Peter J Stewart-Hay replied to the topic 'Copper Gets Tarnished after PVC Insulating Part 2' in the forum.Copper(I) Oxide, Cuprous Oxide, Cuprite or Red Copper Oxide (CuO2)
Cuprous Oxide can easily coat the conductor and it is a brownish-red solid. The chemical formula is CuO2 meaning two oxygen atoms combine with one copper atom. (Cu + O2 = CuO2). On copper wire, you can see the cuprous oxide layer in full color as various shades of reds, oranges, pinks, and purples if the copper has been heated too high (Above about 200 degrees Celsius (392 Fahrenheit) and exposed to oxygen. Moreover keep in mind that when copper is hot, it quickly oxidizes (corrodes or rusts) and this is nothing more than a simple chemical reaction with oxygen.
Copper(II) Oxide, Cupric Oxide (CuO)
Cupric Oxide can as well easily coat the conductor and it is a black solid. Large amounts are produced by roasting mixed copper in a furnace at a temperature below 1,030 °C (1,900 °F).
- Peter J Stewart-Hay created a new topic ' Copper Gets Tarnished after PVC Insulating Part 2' in the forum.The original thread was closed almost four years ago and today we received another question from the company. It was sent to my company instead of to the Forums. We have posted that question here as a new thread. The original thread can be viewed below
The new question is:
In PVC compound, which component easily reacts with copper wire and makes the surface tarnished/blackish on our insulated cable . Please share the particular component details for further investigation in this case.
- Peter J Stewart-Hay replied to the topic 'graduation about prestressed wire straightness' in the forum.Hello Mike,
If you click on the "WAI Store" heading at the left and go to Item you will see this booklet:
"We Do it Straight - Wire Straightening"
This book, published by WITELS Apparate-Maschinen Albert GmbH & Co. KG, is a compilation of findings regarding wire straightening systems—and the results achieved with such systems over the years.
$ 20.00 - We Do it Straight (Member Price)
$ 25.00 - We Do it Straight (List Price)
Unfortunately this item is on back order right now.