From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

---
 3760/CH1/EX1.49/Ex1_49.sce | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 3760/CH1/EX1.49/Ex1_49.sce

(limited to '3760/CH1/EX1.49')

diff --git a/3760/CH1/EX1.49/Ex1_49.sce b/3760/CH1/EX1.49/Ex1_49.sce
new file mode 100644
index 000000000..8cc6265de
--- /dev/null
+++ b/3760/CH1/EX1.49/Ex1_49.sce
@@ -0,0 +1,32 @@
+clc;
+disp('case b');
+// KVA ratings and leakage impedances for the transformers are 
+k1=100; // KVA rating for transformer 1; 
+z1=0.02; // p u impedance for transformer 1; 
+k2=75; // KVA rating for transformer 2; 
+z2=0.03; // p u impedance for transformer 2; 
+k3=50; // KVA rating for transformer 3; 
+z3=0.025; // p u impedance for transformer 3;
+disp('case b(1)');
+// assumng k1 as a base KVA 
+S=225; // load which has to be shared by three transformers
+ze1=z1*100; // percentage impedance for transformer 1 
+ze2=(k1/k2)*z2*100; // percentage impedance for transformer 2
+ze3=(k1/k3)*z3*100; // percentage impedance for transformer 3
+zt=(1/ze1)+(1/ze2)+1/(ze3); // total percentage leakage impedance
+s1=S/(ze1*zt); 
+s2=S/(ze2*zt);
+s3=S/(ze3*zt);
+printf('load shared by transformer 1,2 and 3 are %f KVA, %f KVA and %f KVA respectively\n',s1,s2,s3);
+disp('case b(2)');
+// since transformer 1 has lowest leakage impedance among three, it will be loaded to its rated capacity
+S=k1*ze1*zt ; // total KVA shared
+printf('greatest load that can be shared by transformers is %f KVA\n',S);
+disp('case b(3)');
+// for successful parallel operation of transformer all the three leakage impedances based on their KVA rating  should be equal.Since magnitude of leakage impedance of transformer1 is fixed that is 2 percent z2=z3=2 percent
+ze1=2;
+ze2=ze1*(k1/k2);
+ze3=ze1*(k1/k3);
+zt=(1/ze1)+(1/ze2)+(1/ze3); // Total leakage impedance
+printf('magnitude of equivalent leakage impedance is %f percent\n',zt);
+
-- 
cgit