×
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 type

transformer type

transformer type

(OP)
Hello friends,

Does the type of transformers ( Knan, onan etc) one can use matter depending on whether they will be placed inside or outside a substation ? could someone explain what the rule is on this.

thank you !

RE: transformer type

ONAN Oil Cooled, Natural convection, Air cooled, Natural convection.
ONAF Oil Cooled, Natural convection, Air cooled, Forced convection.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: transformer type

All transformers are suitable for indoor or outdoor use. There are no separate standards for indoor/outdoor installation.

RE: transformer type

Fire codes and local authorities may determine which transformer types are allowed indoors or close to a critical facility. An oil filled transformer can be a fire hazard.

A KNAN transformer with a high fire point liquid is one solution where a transformer failure and fire is a concern.

RE: transformer type

In 1980s, we had Silicone liquid filled transformers installed indoors. The flash point for the Silicone liquid was 340degreeC (if my memory serves me right). This liquid is also known to be fire resistant.
Now a days, these are not preferred and instead, we have natural ester or vegetable based fire resistant liquids available.
Silicone liquids or synthetic and have limited biodegradability and thus are not preferred environmentally.
Mineral oils that are widely used in transformers are not suitable for indoor use due to the low flash point and also because the fire can sustain once started.
'O' in ONAN refers to mineral oil and 'K' in KNAN refers to liquids with >300degC flash point (and thus suitable for indoor use).

Rompicherla Raghunath

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