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Hello Tim, Unfortunately, I really can't provide further insights into the phenomenon you are seeing since I am not an expert on the dielectric properties of water. My guess is that you may be seeing some nonlinear/breakdown effects at the electrode-water interface combined with conduction effects within the bulk water. For example, suppose that your experimental setup develops a thin insulating layer on one, or both, electrodes via anodization. In this case, most of the electrical stress will appear across the thin insulating layer(s). The layers may be able to support a 100 volt stress without breaking down, so you measure relatively low electrolytic conduction losses at this voltage. However, at 400 volts, you may be seeing some breakdown of the insulating layer(s) and thus significantly higher conduction losses through the bulk liquid. But this is only a guess... Good luck and best regards, -- Bert --
: Hi Bert,(again me!!!:D)
: I have two samples in the same nature (same material) with different
: thickness, the one is 1mm and the other is 4mm. I applied on theses two
: levels of voltage: 100V and 400V so the field is the same (100V/mm).
: Although the permittivities of both are the same, the loss in case of 400V
: is higher than the last in all range of frequency, the look of loss index
: is similar and is like conduction cause (straight line increase in lower
: frequency). I tried to find a theory in order to explain that but always
: in fail. The theory of Lampert on the influence of space charge in
: conduction current seems not work because i found the relation
: I ~ V^2/L^3.
: Can you suggest me an another theory on this, knowing that both sample
: contains an amount similar of water.
: Thanks a lot
: The newbie of dielectric
:
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