insulating oil compatibilty

[powerjunx]

Hi guys,

Is it possible to mix different transformer insulating oil like silicone to mineral oil or to the other petroleum based oil used in oil-immersed transformer? What would be the consequences?

Since, ASTM provides different compatibilty test for silicone and petroleum origin such as ASTM D3455-02 and ASTM D5282-05, does it mean we are restricted to mix oils?

Any suggestion and comment would be a great help!


thank u, guys!

 

[Zogzog]

You can do a retrofill but mixing is probally not a good idea.

Scott Peterson
Training Manager
Power Plus Engineering

http://www.epowerplus.com

 

[electricpete]

In the lubricating oil world which is a little different, there have been some pretty dramatic unexpected effects noted from mixing oils.

I agree with Scott it doesn't sound like a good idea.

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[Dumbo2929]

Mixing oils in transformers is not a good thing to do. Different viscosity, can cause uneven heatings, and so on. You can have a unit retrofilled, but it must be drained, cleaned etc.

 

[unclebob]

The only mix I know to be acceptable is RTEMP oil to top up PCB's liquide filled xfo(Askarel, Pyranol, Inerteen...). Do not mix Silicone with any other types of liquides.

As for mixing RTEMP with regular oil, Im not certain but I
would'nt do that. RTEMP is too viscuous...

I

 

[bacon4life]

see thread238-152449