initial commit / add all books

1 files changed, 54 insertions, 0 deletions

diff --git a/3035/CH14/EX14.2/Ex14_2.sce b/3035/CH14/EX14.2/Ex14_2.sce
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+
+// Variable Declaration
+I_f_A = 6000.0      //3-phase fault current of substation A(A)
+I_f_B = 5000.0      //3-phase fault current of substation B(A)
+I_f_C = 3000.0      //3-phase fault current of substation C(A)
+I_f_D = 2000.0      //3-phase fault current of substation D(A)
+I_L_max = 100.0     //Maximum load cuurent(A)
+T = 0.5             //Operating time of breakers(sec)
+ 
+
+I_set = 1.0                         //Setting current(A)
+
+// Calculation Section
+I_L_maxD = I_L_max                  //Maximum load current at D(A)
+CT_D = I_L_max/1                    //CT ratio
+PSM_D = I_f_D/(CT_D*I_set)          //Plug setting multiplier
+TMS_D = 0.1                         //Time multiplier setting
+T_D = 0.14*TMS_D/(PSM_D**0.02-1)    //Time of operation(sec)
+
+I_L_maxC = I_L_max+I_L_maxD         //Maximum load current at C(A)
+CT_C = I_L_maxC/1                   //CT ratio
+PSM_C = I_f_C/(CT_C*I_set)          //Plug setting multiplier
+T_C = T_D+T                         //Minimum time of operation(sec)
+TMS_C = T_C*(PSM_C**0.02-1)/0.14    //Time multiplier setting
+
+I_L_maxB = I_L_max+I_L_maxC         //Maximum load current at B(A)
+CT_B = I_L_maxB/1                   //CT ratio
+PSM_B = I_f_B/(CT_B*I_set)          //Plug setting multiplier
+T_B = T_C+T                         //Minimum time of operation(sec)
+TMS_B = T_B*(PSM_B**0.02-1)/0.14    //Time multiplier setting
+
+I_L_maxA = I_L_max+I_L_maxB         //Maximum load current at A(A)
+CT_A = I_L_maxA/1                   //CT ratio
+PSM_A = I_f_A/(CT_A*I_set)          //Plug setting multiplier
+T_A = T_B+T                         //Minimum time of operation(sec)
+TMS_A = T_A*(PSM_A**0.02-1)/0.14    //Time multiplier setting
+
+// Result Section
+printf('Relay A :')
+printf('CT ratio = %.f/1' ,CT_A)
+printf('PSM of R_A = %.1f' ,PSM_A)
+printf('TMS of R_A = %.1f sec' ,TMS_A)
+printf('\nRelay B :')
+printf('CT ratio = %.f/1' ,CT_B)
+printf('PSM of R_B = %.2f' ,PSM_B)
+printf('TMS of R_B = %.1f sec' ,TMS_B)
+printf('\nRelay C :')
+printf('CT ratio = %.f/1' ,CT_C)
+printf('PSM of R_C = %.1f' ,PSM_C)
+printf('TMS of R_C = %.1f sec' ,TMS_C)
+printf('\nRelay D :')
+printf('CT ratio = %.f/1' ,CT_D)
+printf('PSM of R_D = %.1f' ,PSM_D)
+printf('TMS of R_D = %.2f sec' ,TMS_D)