diff options
Diffstat (limited to '3472/CH21')
| -rw-r--r-- | 3472/CH21/EX21.1/Example21_1.sce | 30 | ||||
| -rw-r--r-- | 3472/CH21/EX21.2/Example21_2.sce | 54 |
2 files changed, 84 insertions, 0 deletions
diff --git a/3472/CH21/EX21.1/Example21_1.sce b/3472/CH21/EX21.1/Example21_1.sce new file mode 100644 index 000000000..d2c81f12e --- /dev/null +++ b/3472/CH21/EX21.1/Example21_1.sce @@ -0,0 +1,30 @@ +// 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 14: LIGHTNING AND PROTECTION AGAINST OVERVOLTAGES DUE TO LIGHTNING
+
+// EXAMPLE : 14.1 :
+// Page number 382
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+RI_072 = 72000.0 // Charactersistic of lightning arrester
+Z_c = 500.0 // Surge impedance(ohm)
+V = 500.0 // Surge voltage(kV)
+
+// Calculations
+// Case(a)
+V_a = 2.0*V // Voltage at the end of line at open-circuit(kV)
+ratio_a = V_a/V // Ratio of voltage when line in open-circuited
+// Case(b)
+I = V*1000/Z_c // Surge current(A)
+R = RI_072/(I)**0.72 // Resistance of LA(ohm)
+ratio_b = R/Z_c // Ratio of voltage when line is terminated by arrester
+
+// Results
+disp("PART II - EXAMPLE : 14.1 : SOLUTION :-")
+printf("\nCase(a): Ratio of voltages appearing at the end of a line when line is open-circuited = %.f", ratio_a)
+printf("\nCase(b): Ratio of voltages appearing at the end of a line when line is terminated by arrester = %.f", ratio_b)
diff --git a/3472/CH21/EX21.2/Example21_2.sce b/3472/CH21/EX21.2/Example21_2.sce new file mode 100644 index 000000000..e3087d143 --- /dev/null +++ b/3472/CH21/EX21.2/Example21_2.sce @@ -0,0 +1,54 @@ +// 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 14: LIGHTNING AND PROTECTION AGAINST OVERVOLTAGES DUE TO LIGHTNING
+
+// EXAMPLE : 14.2 :
+// Page number 383
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+rating = 5000.0 // Rating of transformer(kVA)
+V_hv = 66.0 // HV voltage(kV)
+V_lv = 11.0 // LV voltage(kV)
+V = 66.0 // System voltage(kV)
+fluctuation = 0.1 // Voltage fluctuations
+BIL = 350.0 // BIL for 66kV(kV)
+dynamic_ov = 1.3 // Dynamic over-voltage = 1.3*system operating voltage
+V_power_freq = 1.5 // Power frequency breakdown voltage of arrester = 1.5*arrester rating(kV)
+lower_limit = 0.05 // Margin of lower limit of arrester rating
+
+// Calculation & Result
+disp("PART II - EXAMPLE : 14.2 : SOLUTION :-")
+V_rating = V*(1+fluctuation)*0.8*(1+lower_limit) // Voltage rating of arrester(kV)
+if(round(V_rating)==51) then
+ V_rating_choosen = 50.0 // Arrester rating choosen(kV)
+ V_discharge = 176.0 // Discharge voltage for 50kV arrester(kV)
+ protective_margin = BIL-V_discharge // Protective margin available(kV)
+ V_power_frequency_bd = V_rating_choosen*V_power_freq // Power frequency breakdown voltage(kV)
+ Over_voltage_dynamic = dynamic_ov*V/3**0.5 // Dynamic overvoltage(kV)
+ if(V_power_frequency_bd>Over_voltage_dynamic) then
+ printf("\nFirst arrester with rating 50 kV (rms) & discharge voltage 176 kV chosen is suitable")
+ end
+elseif(round(V_rating)==61) then
+ V_rating_choosen = 60.0 // Arrester rating choosen(kV)
+ V_discharge = 220.0 // Discharge voltage for 50kV arrester(kV)
+ protective_margin = BIL-V_discharge // Protective margin available(kV)
+ V_power_frequency_bd = V_rating_choosen*V_power_freq // Power frequency breakdown voltage(kV)
+ Over_voltage_dynamic = dynamic_ov*V/3**0.5 // Dynamic overvoltage(kV)
+ if(V_power_frequency_bd>Over_voltage_dynamic)
+ printf("\nSecond arrester with rating 60 kV (rms) & discharge voltage 220 kV chosen is suitable")
+ end
+else(round(V_rating)==74) then
+ V_rating_choosen = 73.0 // Arrester rating choosen(kV)
+ V_discharge = 264.0 // Discharge voltage for 50kV arrester(kV)
+ protective_margin = BIL-V_discharge // Protective margin available(kV)
+ V_power_frequency_bd = V_rating_choosen*V_power_freq // Power frequency breakdown voltage(kV)
+ Over_voltage_dynamic = dynamic_ov*V/3**0.5 // Dynamic overvoltage(kV)
+ if(V_power_frequency_bd>Over_voltage_dynamic) then
+ printf("\nThird arrester with rating 73 kV (rms) & discharge voltage 264 kV chosen is suitable")
+ end
+end
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