From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001 From: prashantsinalkar Date: Tue, 10 Oct 2017 12:27:19 +0530 Subject: initial commit / add all books --- 3472/CH10/EX10.21/Example10_21.sce | 43 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 3472/CH10/EX10.21/Example10_21.sce (limited to '3472/CH10/EX10.21') diff --git a/3472/CH10/EX10.21/Example10_21.sce b/3472/CH10/EX10.21/Example10_21.sce new file mode 100644 index 000000000..61ad2aa03 --- /dev/null +++ b/3472/CH10/EX10.21/Example10_21.sce @@ -0,0 +1,43 @@ +// A Texbook on POWER SYSTEM ENGINEERING +// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar +// DHANPAT RAI & Co. +// SECOND EDITION + +// PART II : TRANSMISSION AND DISTRIBUTION +// CHAPTER 3: STEADY STATE CHARACTERISTICS AND PERFORMANCE OF TRANSMISSION LINES + +// EXAMPLE : 3.21 : +// Page number 153 +clear ; clc ; close ; // Clear the work space and console + +// Given data +V_r = 132.0*10**3 // Line voltage at receiving end(V) +P_L = 45.0*10**6 // Load delivered(VA) +PF_r = 0.8 // Lagging power factor +A = 0.99*exp(%i*0.3*%pi/180) // Constant +B = 70.0*exp(%i*69.0*%pi/180) // Constant(ohms) +C = A // Constant +D = 4.0*10**-4*exp(%i*90.0*%pi/180) // Constant + +// Calculations +E_r = V_r/3**0.5 // Receiving end phasemag voltage(V) +I_r = P_L/(3**0.5*V_r)*exp(%i*-acos(PF_r)) // Line current(A) +E_s = A*E_r+B*I_r // Sending end voltage(V) +E_s_llkV = 3**0.5*E_s/1000.0 // Sending end line voltage(kV) +I_s = C*I_r+D*E_r // Sending end current(A) +angle_Er_Es = phasemag(E_s) // Angle between E_r and E_s(°) +angle_Er_Is = phasemag(I_s) // Angle between E_r and I_s(°) +angle_Es_Is = angle_Er_Es-angle_Er_Is // Angle between E_s and I_s(°) +PF_s = cosd(angle_Es_Is) // Sending end power factor +P_s = 3*abs(E_s*I_s)*PF_s // Sending end power(W) +P_skW = P_s/1000.0 // Sending end power(kW) +P_r = P_L*PF_r // Receiving end power(W) +n = P_r/P_s*100 // Transmission efficiency(%) + +// Results +disp("PART II - EXAMPLE : 3.21 : SOLUTION :-") +printf("\nCase(i) : Sending end voltage, E_s = %.1f∠%.f° kV (line-to-line)", abs(E_s_llkV),phasemag(E_s_llkV)) +printf("\nCase(ii) : Sending end current, I_s = %.1f∠%.1f° A", abs(I_s),phasemag(I_s)) +printf("\nCase(iii): Sending end power, P_s = %.f kW", P_skW) +printf("\nCase(iv) : Efficiency of transmission = %.2f percent \n", n) +printf("\nNOTE: Changes in obtained answer from that textbook is due to more precision") -- cgit