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cooling oil for dummy load

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  #1  
Old 01-17-2011, 12:27 AM
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Default cooling oil for dummy load


What oil can be used. I would assume any oil would work so long as it is non conductive but I have yet to test any oil for conductivity.


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Old 01-17-2011, 12:44 AM
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What oil can be used. I would assume any oil would work so long as it is non conductive but I have yet to test any oil for conductivity.
Mineral oil will work in a pinch but it offers less heat dissipation then transformer oil. I believe you can purchase a gallon of "dummy load oil" on eBay for a reasonable price. Do not use any standard oil. Even if it shows low conductivity at DC with your ohm meter, it can respond much differently with RF. They typically have other additives in them that can cause problems.

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Old 01-17-2011, 07:41 AM
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Originally Posted by Shockwave View Post
I believe you can purchase a gallon of "dummy load oil" on eBay for a reasonable price.
How could a guy tell if he was sold transformer oil instead of peanut oil? Just curious.

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Old 01-17-2011, 08:00 AM
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Of course you can get the Mineral Oil at most local pharmacies. I was able to get some transformer oil for free. My electric company has a maintenance hub nearby. I simply went and asked for a gallon from the supervisor. After I explained what I wanted it for he simply had me write out and sign a note of the oils intended use. He then asked for and made a copy of my license and then had one of his crew hook me up with a gallon of the oil. It never hurts to ask.
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Old 01-17-2011, 08:12 AM
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I'll have to hit my FIL up, he retired from the local power company here.

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Old 01-17-2011, 09:37 AM
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I have used heavy mineral oil with no problems in a home made gallon sized dummy load while running an AL-80 into it. Regular cooking oils are not recommended at all and do NOT use any type of lubricating oil such as motor oil. Silicone load oil is the best to use if you can find it. Not sure what the stuff is that the power companies use, it may be silicone based.
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Old 01-17-2011, 10:17 AM
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Originally Posted by 359 View Post
How could a guy tell if he was sold transformer oil instead of peanut oil? Just curious.
You could try frying some peanuts in it and see how they taste.

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Old 01-17-2011, 10:39 AM
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Quote:
Originally Posted by Captain Kilowatt View Post
I have used heavy mineral oil with no problems in a home made gallon sized dummy load while running an AL-80 into it. Regular cooking oils are not recommended at all and do NOT use any type of lubricating oil such as motor oil. Silicone load oil is the best to use if you can find it. Not sure what the stuff is that the power companies use, it may be silicone based.
What about the pure silicone brake fluid available now? Think that would work? Like DOT-5
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