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Oil filled chokes 12,5H
Oil filled chokes 12,5H
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Old 3rd March 2021, 06:22 PM   #11
egellings is offline egellings  United States
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At 210 ohm DCR, the chokes may well have gotten quite warm in use, and the oil would transfer heat out of the windings. Just a guess.
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Old 3rd March 2021, 07:05 PM   #12
Pano is offline Pano  United States
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Oil filled chokes 12,5H
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Old 3rd March 2021, 09:25 PM   #13
trobbins is offline trobbins  Australia
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I recommend you spend the time and do some testing of how the inductance varies with dc current and AC voltage, and do an insulation resistance measurement at 1kVdc. That would then provide confidence on how well and safe those parts can be used in upcoming projects. Vintage chokes like that could be designed for CLC or LC filtering, and the rating plate doesn't identify that or the maximum dc current capability.

Inductance testing can be DIY:
https://www.dalmura.com.au/static/Ch...easurement.pdf
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Old 4th March 2021, 12:21 AM   #14
daqvin_carter is offline daqvin_carter  United States
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It may be worth making sure the chokes still have oil. Seals can fail and slowly let the oil out. Maybe carefully weigh both and make sure they weigh the same.
Sort of fun to see something with oil filled capacitors or chokes and notice dried oil under the terminals.
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Old 4th March 2021, 01:38 AM   #15
Circlotron is offline Circlotron  Australia
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Quote:
Originally Posted by trobbins View Post
I recommend you spend the time and do some testing of how the inductance varies with dc current and AC voltage, and do an insulation resistance measurement at 1kVdc. That would then provide confidence on how well and safe those parts can be used in upcoming projects. Vintage chokes like that could be designed for CLC or LC filtering, and the rating plate doesn't identify that or the maximum dc current capability.

Inductance testing can be DIY:
https://www.dalmura.com.au/static/Ch...easurement.pdf
Yep. The fact that it says "60Hz"on them may mean they are not intended for DC. How big are they physically?
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