diff options
Diffstat (limited to '3835/CH8/EX8.13/Ex8_13.sce')
| -rw-r--r-- | 3835/CH8/EX8.13/Ex8_13.sce | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/3835/CH8/EX8.13/Ex8_13.sce b/3835/CH8/EX8.13/Ex8_13.sce new file mode 100644 index 000000000..49235c9c7 --- /dev/null +++ b/3835/CH8/EX8.13/Ex8_13.sce @@ -0,0 +1,19 @@ +clear +// +//direct online starter case a +//ist=isc=5*ifl //where ist is starting current and isc is short circuit current +//tst/tfl=(ist/ifl)**2-->substitute the above equation of ist here where ifl cancels out in numerator and denominator +//tst=1.25*tfl //tst is starting torque +printf("\n tst=1.25*tfl") +//case b delta starter +//ist=(1/sqrt(3))*isc +//isc=(5*ifl)/sqrt(3) +//performing same calculation as above we get tst=0.4166*tfl +printf("\n tst=0.4166*tfl") +//case c auto transformer starter +//ist=2*ifl +//tst/tfl=(2/1)**2*0.5 +printf("\n tst=0.2*tfl") +//case d +//with a rotor resistance starter the effect is same as that of auto transformer starter since in both cases the starting current is reduce to twice the full load current +printf("\n tst=0.2*tfl") |