<p style="text-align:justify"><span style="font-size:14px">Consider Y-B-g fault (figure 4.42). </span></p>

<p style="text-align:justify"><span style="font-size:14px"><img alt="" src="https://edupmquestionhelp.s3.ap-south-1.amazonaws.com/hint/uploads/images/16164840251616484025.jpg" style="height:675px; width:800px" /></span></p>

<p style="text-align:justify"><span style="font-size:14px">conditions are:</span></p>

<p style="text-align:justify"><span style="font-size:14px">&nbsp;&nbsp;&nbsp;&nbsp; I<sub>R</sub> =0, V<sub>Y</sub> = V<sub>B</sub> = (I<sub>Y</sub> + I<sub>B</sub>) Z<sub>f</sub>,</span></p>

<p style="text-align:justify"><span style="font-size:14px"><span class="math-tex">\(\dot{.\hspace{0.045in}.}\hspace{0.3cm}\)</span>I<sub>1</sub> + I<sub>2</sub> + I<sub>0</sub> = 0</span></p>

<p style="text-align:justify"><span style="font-size:14px">&nbsp;&nbsp;&nbsp; V<sub>Y</sub> = V<sub>B</sub></span></p>

<p style="text-align:justify"><span style="font-size:14px"><span class="math-tex">\(\dot{.\hspace{0.045in}.}\hspace{0.3cm}a^2V_1+aV_2+V_0=aV_1+a^2V_2+V_0\)</span></span></p>

<p style="text-align:justify"><span style="font-size:14px"><span class="math-tex">\(\dot{.\hspace{0.045in}.}\hspace{0.3cm}\)</span>&nbsp;V<sub>1</sub> = V<sub>2</sub></span></p>

<p style="text-align:justify"><span style="font-size:14px">&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;V<sub>Y</sub> = (I<sub>Y</sub> + I<sub>B</sub>) Z<sub>f</sub> </span></p>

<p style="text-align:justify"><span style="font-size:12px"><span class="math-tex">\(a^2V_1+aV_2+V_0\)</span></span></p>

<p style="text-align:justify"><span class="math-tex">\(=(a^2I_1+aI_2+I_0+aI_1+a^2I_2+I_0)Z_f\)</span></p>

<p style="text-align:justify"><span style="font-size:14px"><span class="math-tex">\(\dot{.\hspace{0.045in}.}\hspace{0.3cm}V_0-V_1=3I_0Z_f\)</span>&nbsp;&nbsp;&hellip;&hellip;.as V<sub>1</sub> = V<sub>2</sub> and</span></p>

<p style="text-align:justify"><span style="font-size:14px">&nbsp; &nbsp; &nbsp; &nbsp;I<sub>1</sub> + I<sub>2</sub> + I<sub>0</sub> = 0</span></p>

<p style="text-align:justify"><span style="font-size:14px">These relations between sequence quantities are satisfied in figure 4.43.</span></p>

<p style="text-align:justify"><span style="font-size:14px"><img alt="" src="https://edupmquestionhelp.s3.ap-south-1.amazonaws.com/hint/uploads/images/16164840771616484077.jpg" style="height:545px; width:800px" /></span></p>

<p style="text-align:justify"><span style="font-size:14px">From figure 4.43,</span></p>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify"><span style="font-size:14px"><span class="math-tex">\(I_1=\frac{E}{Z_1+\frac{Z_2(Z_0+3Z_f)}{Z_2+Z_0+3Z_f}}\)</span></span></p>

<p style="text-align:justify"><span style="font-size:14px">I<sub>2</sub> and I<sub>0</sub> can be found from figure 4.43 or from figure 4.44 (circuit of figure 4.43 redrawn in a different way to understand). </span></p>

<p style="text-align:justify"><span style="font-size:14px"><img alt="" src="https://edupmquestionhelp.s3.ap-south-1.amazonaws.com/hint/uploads/images/16162258811616225881.jpg" style="height:460px; width:800px" /></span></p>

<p style="text-align:justify"><span style="font-size:14px">Then V<sub>1</sub>, V<sub>2</sub> and V<sub>0</sub> can be found and finally V<sub>R</sub>, V<sub>Y</sub>, V<sub>B</sub>, I<sub>R</sub>, I<sub>Y</sub> and I<sub>B</sub> can be calculated.</span></p>