PERCUSSIVE AV ELDING 



893 



du 

 dx 



(8) 



(9) 



The required heat input mu.st now !)(' set e(iual (o that suppUed by 

 the weUUn"- circuit:* 



or 



1/17 ^^^^ 



2KA T 



aVm^/T y/t 



(10) 



(11) 



The current time relationship represented by equation (11) is that due 

 to a capacitati^'e transmission line working into a short circuit. Since 

 the arc ^•oltage is considerably low^er than the voltage to which the line 

 is charged, it is substantially a short circuit. 



Fig. 3- — Current time characteristic, (a) Ideal circuit (capacitative line), 

 (b) and (c) single section RC networks. 



* It will be assumed tliat the energy of the arc is divided {>((ual]y l)y the two 

 opposing surfaces. 



