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The measure of current in one phase before the star or delta arrangement of the component is called line current (typically input current in motor or output current in the alternator). This is now converted to a three phase transmission line by introducing a third conductor of same radius.

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The equations above give us. The series impedance of the lines is z = 0.03 + j0.3 ω/km, and the shunt admittance is. Conductance accounts for the leakage current at the insulators of overhead lines and the insulation of cables.

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But, keep in mind that the principles presented apply to all transmission lines.

Learn what is line voltage, line current, phase voltage, and phase current, their differences, examples, formulas, and equation, star and delta system

Line current represents the aggregate flow of electric charge, whereas phase current represents the flow of electric charge through a single phase. This conductor is fixed at an equal distance d from the two single phase conductors. Learn what a transmission line is, the types of transmission lines, and the abcd parameters and theory that define transmission lines. The voltage at these points on a transmission line will depend on their location, therefore each of these locations will have a different voltage.

Since the leakage is small, conductance is usually neglected.