INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Wire Varnish Aging

Wire Varnish Aging

(OP)
Hello All,

Is anyone familiar with wire varnish aging or degradation over time? I have had failures occuring and we have come to a couple of conclusions that there are two different wire varnishes being used....a polyamide-imide and an urathane acrylate. The other difference is porosity found in the potting material.

One of the suspected issues is the wire varnish degrading over time but we are unsure as to if this happens/how this happens/ or any information on that.

Any input is greatly appreciated.

Thanks!

RE: Wire Varnish Aging

(OP)
We suspected overheating however could not get the system to reach temperatures above the wire varnish capabilities using the normal duty profile. Since I posted this we have figured out that the components were not being used per the duty cycle and it is in fact exceeding temperature.

I never did find information on the varnish degredation in my research, so I suspect that degredation over time doesn't occur enough for it to cause problems.

Thanks for the response!

RE: Wire Varnish Aging

All organic materials, including polymers, degrade with time due to oxidation and/ or hydrolysis. The rate is very strongly temperature dependent. High electric fields caused by high voltage and sharp points generate ions in the air which are powerful oxidizers.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close