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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /3472/CH45/EX45.2/Example45_2.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '3472/CH45/EX45.2/Example45_2.sce')
| -rw-r--r-- | 3472/CH45/EX45.2/Example45_2.sce | 40 |
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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)
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