Calculate the magnitude of fault current, Electrical Engineering

Figure shows an isolated three-phase load supplied from a 33 kV/11 kV substation via a 30 km long three-phase 11 kV overhead line. The overhead line has the following series parameters:

Series inductive reactance = 0.28 Ω/km/phase

Series resistance = 0.22 Ω/km/phase

Line capacitance and shunt leakage effects may be neglected.

The line supplies a small industrial site fed from a 600 KVA, 11 kV/415 V delta/star transformer with an impedance of 6% (calculated on transformer rating) and negligible resistance. The transformer secondary is earthed via a 1Ω earthing resistor.

The site has a load of 450 kVA at a power factor of 0.7 lagging. The voltage at the 33kV bus at the substation is maintained at 33.1kV and the 33kV fault level at the substation is 2000 MVA.

Calculate the magnitude of the fault current at the transformer secondary terminals for the following types of fault:

(i)  phase-to-earth fault

(ii)  phase-to-phase fault

(iii)  phase-to-phase to earth fault

24_Total Harmonic Distortion.png

Posted Date: 2/21/2013 4:32:32 AM | Location : United States







Related Discussions:- Calculate the magnitude of fault current, Assignment Help, Ask Question on Calculate the magnitude of fault current, Get Answer, Expert's Help, Calculate the magnitude of fault current Discussions

Write discussion on Calculate the magnitude of fault current
Your posts are moderated
Related Questions
please I need help in matlab to program complex expression in antenna diversity please

(a) Draw and illustrate the V-I characteristics of PN junction diode. How the characteristics reflected with change in temperature? (b) Describe physically why a PN junction dio

a. Write the advantages of choosing a single purpose processor over a general purpose processor. b. List out the hardware units that must be there in the embedded systems. c.

Schottky  diodes The schottky diodes have very fast recovery time and  low forward drop.  The current  ratings of  these diodes  vary  from 1A to 300 a and  maximum  allowable

Q. What do you mean by Time consistent Busy Hour? (i) Busy Hour (ii) Peak Busy Hour (iv) Time consistent Busy Hour  (v) Traffic intensity Ans: (i)  Busy Hour: C

which ckt. Or components using for irregular ac sine wave change into pure sine wave.......

Q. Three waveforms seen on an oscilloscope are shown in Figure. If the horizontal scale is set to 50 ms per division (500 ms for the entire screen width), and the vertical scale is

Sign flag Since D 7  bit in the  results is 0sign flag is reset. This also  shown that the results is positive.

Q. Explain the bandwidth for the curve and the applications of an RC coupled amplifier. Frequency response curve of an RC coupled amplifier was shown above(prev page). The cut

what is the function of CBW in the microprocessor