The series impendance matrix of a short three-phase transmission line in phase coordinates is ⎡⎢⎣ZsZmZmZmZsZmZmZmZs⎤⎥⎦. If the positive sequence impedance is (1 + j10) Ω, and the zero sequence impedance is (4 + j31) Ω, then the imaginary part of Zm(in Ω) is (upto to 2 decimal places).7

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