# Chapter 05 : High Voltage DC Transmission¶

## Example 5.1, Page No 107¶

In [1]:
import math
#initialisation of variables
Vo=3*math.sqrt(2)*110/math.pi

#Calculations

#Results
print("(a)For a=0, Vd=%.2f kV" %Vd)
print("(b)For a=30,Vd=%.2f kV" %Vd1)
print("(c)For a=45,Vd=%.2f kV" %Vd2)

(a)For a=0, Vd=146.02 kV
(b)For a=30,Vd=116.85 kV
(c)For a=45,Vd=89.66 kV


## Example 5.2, Page No 107¶

In [2]:
import math
#initialisation of variables

#Calculations
print("VL=%.2f kV" %VL)  #Answers don't match due to difference in rounding off of digits
Tr=VL/110.0

#Results
print("tap ratio=%.2f " %Tr)

VL=94.14 kV
tap ratio=0.86


## Example 5.3, Page No 109¶

In [3]:
import math
#initialisation of variablesVd=100000
Id=800.0  # current

#Calculations
X=((3*math.sqrt(2.0)*94.115*0.866*1000.0/math.pi)-Vd)*math.pi/(3.0*Id)

#Results
print("effective reactance per phase , X=%.2f ohm\n" %X)	#Answer don't match due to difference in rounding off of digits

effective reactance per phase , X=143.89 ohm



## Example 5.4 Page No 112¶

In [4]:
import math
#initialisation of variables
a=15.0
d0=10.0
y=15.0
X=15.0
R=10.0

#Calculations

Id=249.99 amp.