Chpater 14 Overvoltages on Power systems

Example 14_1 pgno453

In [2]:
#Chapter 14,Example 1, page 453
#Determine the time to crest 


I = 400 # mH of inductance
L = 500*10**-3 # mH
C = 1.5*10**-6 # micro F
from math import pi,sqrt
f = 1/(2*pi*sqrt(L*C))  
t = 10**6/(4*f) # calulation done in the text is wrong
print"\n f1 =  Hz",f
print"\n Time to crest =  micro seconds",round(t)
 f1 =  Hz 183.776298474

 Time to crest =  micro seconds 1360.0