Stacked Ring Insulator Breakdown

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        Calculate:   Breakdown Voltage      Output Format        Notes

Definition:                           

Equation

Parameters

Diagram

Calculate Breakdown Electric Field of Acrylic:                  top

Parameter

Value

Units

Special Values

Inputs:

t (pulse width)
d (length)  
r (ave. radius)
N (#insulators)
         

Output:

V(breakdown)

 

Output Format:                                                        top

Select Format: Scientific Engineering Fixed

 

Notes:                                                                       top

Source:  1992 Pulsed Power Formulary (Power Modulator Symposium)

For Acrylic insulators in vacuum with 45 degree bevel
Assumes pressure below 10-4 Torr 
Variations observed at pressures as low as  10-6 Torr 
Typical for 1-2" long insulators and more that 5 insulators
Dependence of breakdown field on angle of oiled plexiglass:
(from Pulsed Breakdown of Insulator Surfaces in a Poor Vacuum by I.D.Smith, 1966)

 

Copyright 2000  Raymond J. Allen