Question $\backslash$#$2$

A close$-$in SLG fault on FDR$23,$ generates $18$ kA $,$ with an $\backslash (\backslash$mathrm$\{$X$\}/\backslash$mathrm$\{$R$\}\backslash )$ ratio of $17.$ If the goal of the design is to avoid CT saturation, evaluate the performance of the existing CT tap shown on the drawing. If you find the CT tap inadequate, select the minimum CT tap that can be used. Demonstrate mathematically or graphically $($using the PSRC spreadsheet$)$ that your choice works. Assume the total cable impedance for the CT is $1\mathrm{.}1$ ohms. You may use the CT excitation curve, for a C$800,2000/5$ CT used in class for this question.