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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/CH39/EX39.18/Example39_18.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
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| -rw-r--r-- | 3472/CH39/EX39.18/Example39_18.sce | 36 |
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diff --git a/3472/CH39/EX39.18/Example39_18.sce b/3472/CH39/EX39.18/Example39_18.sce new file mode 100644 index 000000000..b7be75add --- /dev/null +++ b/3472/CH39/EX39.18/Example39_18.sce @@ -0,0 +1,36 @@ +// 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 1: INDUSTRIAL APPLICATIONS OF ELECTRIC MOTORS
+
+// EXAMPLE : 1.18 :
+// Page number 699-700
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+V = 400.0 // Voltage of IM(V)
+p = 4.0 // Number of poles
+f = 50.0 // Frequency(Hz)
+hp = 25.0 // Power developed(hp)
+S = 0.04 // Slip
+R_X_2 = 1.0/4 // Ratio of rotor resistance to standstill reactance i.e R2/X2
+
+// Calculations
+N_s = 120*f/p // Synchronous speed(rpm)
+N_fl = N_s*(1-S) // Full load speed(rpm)
+T_fl = hp*735.5*60/(2*%pi*N_fl*9.81) // Full-load torque(kg-m)
+S_1 = 1.0 // Slip at standstill
+X_R_2 = 1.0/R_X_2 // Ratio of standstill reactance to rotor resistance
+T_s_fl = S_1/S*((1+(S*X_R_2)**2)/(1+(S_1*X_R_2)**2)) // T_standstill/T_fl
+T_standstill = T_s_fl*T_fl // Standstill torque(kg-m)
+S_instant = (N_s+N_fl)/N_s // Slip at instant of plugging
+T_initial = (S_instant/S)*((1+(S*X_R_2)**2)/(1+(S_instant*X_R_2)**2))*T_fl // Initial plugging torque(kg-m)
+
+// Results
+disp("PART IV - EXAMPLE : 1.18 : SOLUTION :-")
+printf("\nInitial plugging torque = %.1f kg-m", T_initial)
+printf("\nTorque at standstill = %.f kg-m\n", T_standstill)
+printf("\nNOTE: ERROR: Calculation mistake from full-load torque onwards. Hence, change in obtained answer from that of textbook")
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