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/CH45/EX45.2/Example45_2.sce | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 3472/CH45/EX45.2/Example45_2.sce

(limited to '3472/CH45/EX45.2/Example45_2.sce')

diff --git a/3472/CH45/EX45.2/Example45_2.sce b/3472/CH45/EX45.2/Example45_2.sce
new file mode 100644
index 000000000..a6cc5dffe
--- /dev/null
+++ b/3472/CH45/EX45.2/Example45_2.sce
@@ -0,0 +1,40 @@
+// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION 
+
+// PART IV : UTILIZATION AND TRACTION
+// CHAPTER 7: CONTROL OF MOTORS
+
+// EXAMPLE : 7.2 :
+// Page number 798
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+W = 175.0        // Weight of multiple unit train(tonnes)
+no = 6.0         // Number of motors
+F_t = 69000.0    // Total tractive effort(N)
+V = 600.0        // Line voltage(V)
+I = 200.0        // Average current(A)
+V_m = 38.6       // Speed(kmph)
+R = 0.15         // Resistance of each motor(ohm)
+
+// Calculations
+alpha = F_t/(277.8*W)                             // Acceleration(km phps)
+T = V_m/alpha                                     // Time for acceleration(sec)
+t_s = (V-2*I*R)*T/(2*(V-I*R))                     // Duration of starting period(sec)
+t_p = T-t_s                                       // (sec)
+energy_total_series = no/2*V*I*t_s                // Total energy supplied in series position(watt-sec)
+energy_total_parallel = no*V*I*t_p                // Total energy supplied in parallel position(watt-sec)
+total_energy = (energy_total_series+energy_total_parallel)/(1000*3600)         // Energy supplied during starting period(kWh)
+energy_waste_series = (no/2)/2*(V-2*I*R)*I*t_s    // Energy wasted in starting resistance in series position(watt-sec)
+energy_waste_parallel = no*(V/2)/2*I*t_p          // Energy wasted in starting resistance in parallel position(watt-sec)
+total_energy_waste = (energy_waste_series+energy_waste_parallel)/(1000*3600)   // Total energy wasted in starting resistance(kWh)
+energy_lost = (no*I**2*R*T)/(1000*3600)           // Energy lost in motor resistance(kWh)
+useful_energy = T*F_t*V_m/(2*3600**2)             // Useful energy supplied to train(kWh)
+
+// Results
+disp("PART IV - EXAMPLE : 7.2 : SOLUTION :-")
+printf("\nEnergy supplied during the starting period = %.2f kWh", total_energy)
+printf("\nEnergy lost in the starting resistance = %.1f kWh", total_energy_waste)
+printf("\nUseful energy supplied to the train = %.1f kWh", useful_energy)
-- 
cgit