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Registered Member #256
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Posts: 124
i never had problems with the Al ripping, but it was kinda hard to roll up and get it to roll straight, i used a piece of 1/2 inch pvc to wrap the cap around and soucked in oil in a piece of 4" pvc, fit perfectly...
Registered Member #157
Joined: Sun Feb 12 2006, 08:00PM
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Posts: 76
streamers rule wrote ...
i never had problems with the Al ripping, but it was kinda hard to roll up and get it to roll straight, i used a piece of 1/2 inch pvc to wrap the cap around and soucked in oil in a piece of 4" pvc, fit perfectly...
The polcarbonate sheets i used wernt perfectly flat so air could get trapped so i coated the sheets in oil as i went and the Al got stuck a few times and diddent slide as well as it did when dry and it ripped while slidding between the sheets during rolling.
Registered Member #354
Joined: Thu Mar 30 2006, 10:12AM
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Good idea with oil. What dielectric strength did you measured? (I have seen very different values at web)
I have done the following calculus:
material PE UHMW PE standard Mylar Barium Titan e0 8.85E-12 8.85E-12 8.85E-12 8.85E-
12 er 2.33 2.33 3.1 300 ur permeab 1 1 1 1 V ruptura MV/m 354 181 181 4 Largo m 1 1 1 1 Diametro m 0.5 0.5 0.5 0.5 espesor um 1000 1000 500 500 ´´ m 1.00E-03 1.00E-03 5.00E-04 5.00E-04 capas 250 250 500 500 long capa m 196.3495408 196.3495408 392.6990817 392.6990817 A
m2 1.96E+02 1.96E+02 3.93E+02 3.93E+02 C F 4.05E-06 4.05E-06 2.15E-05 2.09E-03 pF 4048825.707 4048825.707 21547398.61 2085232124 L H 6.40E-12 6.40E-12 1.60E-12 1.60E-12 nH 0.0064 0.0064 0.0016 0.0016 Z ohm 0.001257261 0.001257261 0.000272498 2.77002E-05 V max V 3.54E+05 1.81E+05 9.05E+04 2.00E+03 E Kjul 0
.2537 0.0663 0.0882 0.0042 Vol m3 0.1963 0.1963 0.
1963 0.1963 E/vol KJ/
m3 1.2920 0.3378 0.4494 0.0212
(it is in spanish I am sorry)
Very few nH because I connect the "+" whole sheet in a side and the "-" in another Polyester UHMW has more KJoules/m3 but must be expensive
________________
The table can not be seen well, I will make a resume:
Poliester UHMW: 1.3 Kjul/m3 Poliester standard: 0.33 Kjul/m3 Mylar 0.45 Kjul/m3 Barium Titanate: 0.02 Kjul/m3 (because only widstand 4MV/m) mod edit- NO DOUBLE POSTING
GODSFUSION wrote ...
The polcarbonate sheets i used wernt perfectly flat so air could get trapped so i coated the sheets in oil as i went and the Al got stuck a few times and diddent slide as well as it did when dry and it ripped while slidding between the sheets during rolling.
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Homemade HV big capacitors
