diff options
Diffstat (limited to '1445/CH10/EX10.12')
| -rw-r--r-- | 1445/CH10/EX10.12/ch10_ex_12.sce | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/1445/CH10/EX10.12/ch10_ex_12.sce b/1445/CH10/EX10.12/ch10_ex_12.sce new file mode 100644 index 000000000..c2ab1d370 --- /dev/null +++ b/1445/CH10/EX10.12/ch10_ex_12.sce @@ -0,0 +1,43 @@ +//CHAPTER 10- THREE-PHASE INDUCTION MACHINES +//Example 12 + +disp("CHAPTER 10"); +disp("EXAMPLE 12"); + +//VARIABLE INITIALIZATION +v=440; //in Volts +I=1200; //in Amperes +eff=0.85; //full load efficiency +pow_fact=0.8; //full load power factor + +//SOLUTION + +//solution (a) +I_fl1=I/5; //starting current at rated voltage is 5 times the rated full-load current +p1=sqrt(3)*v*I_fl1*pow_fact*eff; +disp(sprintf("(a) The maximum rating when the motor starts at full voltage is %f kW",p1/1000)); + +//solution (b) +I_fl2=I/((0.8^2)*5); +p2=sqrt(3)*v*I_fl2*pow_fact*eff; +disp(sprintf("(b) The maximum rating when the motor is used with an auto-transformer is %f kW",p2/1000)); + +//solution (c) +I_fl3=I/((0.578^2)*5); +p3=sqrt(3)*v*I_fl3*pow_fact*eff; +disp(sprintf("(c) The maximum rating when the motor is used with star-delta starter is %f kW",p3/1000)); + +//The answers are slightly different due to precision of floating point numbers + +//END + + + + + + + + + + + |