In a short circuit analysis, the positive, negative and zero sequence per unit reactance of 0.25, 0.25, and 0.3 respectively. The base MVA is 100. Determine the fault current for a three phase fault at the 115kV level. KVAf = KVAc / Xpu = 100000/0.25 = 1312.18 A If = 400000 / sqrt(3)(115) = 2008 A 

how did you get the 400000?

 

Answer:

This method is wrong because positive negative and zero sequence given in per units terms or voltage is given in kilovolts so we can't do like this .

First we have to convert voltage in per unit so that we can assume base .

And final answer is also wrong its will be 200.8 not 2008

please use this google drive link to download the answer file.

https://drive.google.com/file/d/18lVikkDJAkp-8be9F59afMhaf5ynGLi2/view?usp=sharing

note: if you have any trouble in viewing/downloading the answer from the given link, please use this below guide to understand the whole process.

https://helpinhomework.org/blog/how-to-obtain-answer-through-google-drive-link