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| dielectric constant for glycerin |
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| LaserTazerPhaser:
Going to make a high voltage capacitor with glycerin as the insulator. Its dielectric constant is ~40 and it says nothing about its dissipation in AC circuits (Spark Gap TC) which is what this capacitor is intended for. Plates are 0.6mm pcbs cap pcb plates Cap will have ceramic washers to space the plates at the corners. There will be more plates in the capacitor than in the assembly image. |
| BravoV:
As glycerin is very hygroscopic subtance, curious how do you plan to dry it ? |
| LaserTazerPhaser:
--- Quote from: BravoV on March 21, 2019, 04:57:01 am ---As glycerin is very hygroscopic subtance, curious how do you plan to dry it ? --- End quote --- Do you mean glycerin needs drying before it assumes its dielectric constant? The cap will be airtight and nearly entirely filled to the top with the oil. Was going to use this for something else but the capacitor will fit in it much better https://www.mouser.com/ProductDetail/546-1591USGY |
| BravoV:
--- Quote from: LaserTazerPhaser on March 21, 2019, 04:58:33 am --- --- Quote from: BravoV on March 21, 2019, 04:57:01 am ---As glycerin is very hygroscopic subtance, curious how do you plan to dry it ? --- End quote --- Do you mean glycerin needs drying before it assumes its dielectric constant? The cap will be airtight and nearly entirely filled to the top with the oil. Was going to use this for something else but the capacitor will fit in it much better https://www.mouser.com/ProductDetail/546-1591USGY --- End quote --- How do you know your newly purchased glycerin is dry ? As its so hygroscopic, when exposed to open air, it will start to absorb water vapour from the air. As you mentioned it your self, this will be for HV stuff, and surely doesn't play well with water or absorbed humidity between that two HV plates isn't it ? Not sure, I'm not the expert. :-// |
| LaserTazerPhaser:
--- Quote from: BravoV on March 21, 2019, 05:06:45 am --- --- Quote from: LaserTazerPhaser on March 21, 2019, 04:58:33 am --- --- Quote from: BravoV on March 21, 2019, 04:57:01 am ---As glycerin is very hygroscopic subtance, curious how do you plan to dry it ? --- End quote --- Do you mean glycerin needs drying before it assumes its dielectric constant? The cap will be airtight and nearly entirely filled to the top with the oil. Was going to use this for something else but the capacitor will fit in it much better https://www.mouser.com/ProductDetail/546-1591USGY --- End quote --- How do you know your newly purchased glycerin is dry ? As its so hygroscopic, when exposed to open air, it will start to absorb water vapour from the air. As you mentioned it your self, this will be for HV stuff, and surely doesn't play well with water or absorbed humidity between that two HV plates isn't it ? Not sure, I'm not the expert. :-// --- End quote --- Lab grade glycerin can used to ensure no vapor was absorbed. Im mainly concerned for its RF power losses. Im also considering deionized water for dielectric. |
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