×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

transformer oil

transformer oil

transformer oil

(OP)
which type of oil is used in transformer cooling? what are its specifications?

RE: transformer oil

Transformer oil is commonly called mineral oil (but I think the term mineral oil applies to many other substances as well).  If you call a supplier and ask for transformer oil they'll probably know what you want.  To my knowledge there's not a standard spec.  As I remember one major distributor only had two types available... with or without artificial oxidation inhibitor.  But you may want to add specs related to testing of parameters that are important to you.  Dielectric strength is a fundamental requirement for electrical equipmet... try asking for 30kv (also have to specify which type of test).  Moisture - generally don't want to put >20ppm (by Karl Fisher) into your transformers, so you should specify 20ppm or less.  Neutralization number -<0.1 mg/kg k-oh. PCB - not detectable.  Typical values for some other parameters that aren't critical may include: 0.88 specific gravity,  57-62 SSU (viscoity), 130-145C flash point, -40C pour point.  Also there are 2 varieties of testing you can do: one is a certified test provided by your supplier; the other is a sample you draw from the tanker when it arrives or througout the fille process (provides more direct confirmation).  

RE: transformer oil

Suggestion: Environmentally/ecologially safe tranformer oil may be also considered, e.g. visit
http://www.midel.com/home_en.htm
for more info

RE: transformer oil

On the specs page for Midel they quote IEC spec IEC 1099.  I haven't heard of that one.  

http://standards.ieee.org/catalog/olis/dtransformers.html
has a list of transformer-related standards from IEEE.

62-1995 IEEE Guide for Diagnostic Field Testing of Electric Power Apparatus--Part 1: Oil Filled Power Transformers, Regulators, and Reactors  - has a few specs for moisture etc.

There's also a few guides in that link for reclamation of tranformer oil, specs for silicon oil (fire retardant). I remember one more specifically on limits for transformer oil (prior to putting it in transformers), but I didnt see it at the above link.

Midel provides their oil up to 50ppm moisture?  Way too high for high-voltage transformers.

RE: transformer oil

Doble Engineering has a Tranformer Oil Purchase Specification (TOPS) which can be used when specifing txf oil.
There is also an ASTM Standard D-117 "Standard Method of Testing and Specifications for Electrical Insulating Oils of Petroleum origin"
Transformer oil is also commonly refered to as 10C oil.

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