DIY a 30kV 0.2uF Capacitor using mylar film and aluminium foil

DIY a 30kV 0.2uF Capacitor using mylar film and aluminium foil
0.1mm Mylar Film x 2
Width = 30cm, Total Length = 9.6m x 2
Fold into 8cm x 60 layers (120 foldings)
M1
M2
A1
A2
Mylar Film Breakdown
Voltage : 0.1mm ‐> 15000V
0.2mm ‐> 22000V
0.25mm ‐> 25000V
0.3mm ‐> 27500V
0.4mm ‐> 32000V I use 0.1mm mylar film which can only tolerate 15kV. If we need to increase the breakdown voltage to 30kV, we need to increase the thickness to 0.4mm!! An alternative way is to connect 2 cap. of 0.1mm mylar films in series :
A1
A3
A2
M1
M2
A3
1 layer = 2 foldings
Aluminium Foil
Mylar Film
Wire
Wire
Aluminium Foil x 3
Width = (A1&A3) 30cm , (A2) 26cm
Total Length = 9.6m x 3
Use special Aluminium solder wire
to connect the 2 sides to the wires
Aluminium A1 & A3 shift about 2cm margin out of the mylar film in opposite
direction to avoid high voltage arc occur on
the edges.
0.1mm Mylar Film (30cm x 9.6m x 2)
Aluminum Foil
Special Solder Wire for Aluminium / Steel
Folding aluminium foil in between mylar layers
Completed
Soldering outlets on both sides
I’ve made more layers, result in 0.335uF For 0.2uF 30kV needs 60 layers