diff options
Diffstat (limited to '3035/CH7/EX7.4/Ex7_4.sce')
| -rwxr-xr-x | 3035/CH7/EX7.4/Ex7_4.sce | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/3035/CH7/EX7.4/Ex7_4.sce b/3035/CH7/EX7.4/Ex7_4.sce new file mode 100755 index 000000000..c7383b055 --- /dev/null +++ b/3035/CH7/EX7.4/Ex7_4.sce @@ -0,0 +1,31 @@ +// Variable Declaration +P = 5.0 //Power of substation(MVA) +V_hv = 33.0 //High voltage(kV) +V_lv = 11.0 //Low voltage(kV) +f = 50.0 //Frequency(Hz) +P_1 = 0.5 //Minimum load(MW) +pf_1 = 0.85 //Lagging power factor of minimum load +P_2 = 2.8 //Maximum load(MW) +pf_2 = 0.78 //Lagging power factor of maximum load +pf_i = 0.9 //Lagging power factor of incoming current + +// Calculation Section +theta_1 = acos(pf_1) +theta_2 = acos(pf_2) +theta_i = acos(pf_i) + +load_react = P_1*tan(theta_1)*1000 //Load reactive power(kVAR) +line_react = P_1*tan(theta_i)*1000 //Reactive power supplied by line(kVAR) +rating_fix = load_react - line_react //kVAR rating of fixed capacitor bank(kVAR) + +bank_react = P_2*(tan(theta_2)-tan(theta_i))*1000 //Reactive power to be supplied by capacitor banks(kVAR) +rating_swi = bank_react - rating_fix //Reactive power rating of switched unit(kVAR) + +C_fix = rating_fix*10**-3/(3**0.5*V_lv**2*2*%pi*f) //Capacitance for fixed bank +C_swi = rating_swi*10**-3/(3**0.5*V_lv**2*2*%pi*f) //Capacitance for switched bank + +// Result Section +printf('kVAR rating of fixed capacitors = %.1f kVAR' ,rating_fix) +printf('kVAR rating of switched capacitors = %.1f kVAR' ,rating_swi) +printf('Capacitance of fixed bank , C = %.2e F/phase' ,C_fix) +printf('Capacitance of switched bank , C = %.2e F/phase' ,C_swi) |