GATE Electrical Engineering (EE) 2017 Shift 1 Solved Paper

Question : 50 of 65

Marks: +1, -0

The bus admittance matrix for a power system network is

{[\table −j39.9 , j20 , j20 ; j20 , −j39.9 , j20 ; j20 , j20 , −j39.9 ; ]}pu

There is a transmission line, connected between buses 1 and 3, which is represented by the circuit shown in figure.

If this transmission line is removed from service, what is the modified bus admittance matrix?

${[\table −j19.9 , j20 , 0 ; j20 , −j39.9 , j20 ; 0 , j20 , −j19.9 ; ]}pu$
${[\table −j39.95 , j20 , 0 ; j20 , −j39.9 , j20 ; 0 , j20 , −j39.95 ; ]}pu$
${[\table −j19.95 , j20 , 0 ; j20 , −j39.9 , j20 ; 0 , j20 , −j19.95 ; ]}pu$
${[\table −j19.95 , j20 , j20 ; j20 , −j39.9 , j20 ; j20 , j20 , −j19.95 ; ]}pu$

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