diff options
Diffstat (limited to '3681/CH5/EX5.16/Ex5_16.sce')
| -rw-r--r-- | 3681/CH5/EX5.16/Ex5_16.sce | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/3681/CH5/EX5.16/Ex5_16.sce b/3681/CH5/EX5.16/Ex5_16.sce new file mode 100644 index 000000000..a25af31af --- /dev/null +++ b/3681/CH5/EX5.16/Ex5_16.sce @@ -0,0 +1,21 @@ +// Calculating the instantaneous radial force on the h.v. winding if a short circuit occurs at the terminals of the l.v. winding with h.v. energised and the force at full load
+clc;
+disp('Example 5.16, Page No. = 5.97')
+// Given Data
+// 6600/400 V, delta/star 3-phase core type transformer
+Q = 1000;// kVA rating
+f = 50;// Frequency (in Hz)
+u0 = 4*%pi*10^(-7);
+T = 500;// h.v winding turns
+Lmt = 1.3;// Length of mean turn (in meter)
+Lc = 0.6;// Height of winding (in meter)
+m = 1.8;// Doubling effect multiplier
+// Calculation of the per unit leakage reactance
+I_fl = Q*1000/(3*6600);// Full load current per phase on h.v. side (in Ampere)
+i = m*2^(1/2)*(1/0.05)*I_fl;// Instantaneous peak value of short circuit current (in Ampere)
+Fr = u0/2*(i*T)^(2)*Lmt/Lc;// Total instantaneous radial force on the h.v. coil (in N)
+disp(Fr,'Total instantaneous radial force on the h.v. coil (N)=');
+Fr = u0/2*(I_fl*T)^(2)*Lmt/Lc;// Force at full load (in N)
+disp(Fr,'Force at full load (N)=');
+disp('This shows that the forces under short circuit conditions are considerably large as compared with forces at full load')
+//in book answers are 2330000 (N) and 866 (N). The answers vary due to round off error
|