5Shunt Admittance of Overhead and Underground Lines
The shunt admittance of a line consists of the conductance and the capacitive susceptance. The conductance is usually ignored because it is very small compared to the capacitive susceptance. The capacitance of a line is the result of the potential difference between conductors. A charged conductor creates an electric field that emanates outward from the center of the conductor. Lines of equipotential are created that are concentric to the charged conductor. This is illustrated in Figure 5.1.
In Figure 5.1, a difference in potential between two points (P1 and P2) is a result of the electric field of the charged conductor. When the potential difference between the two points is known, the capacitance ...
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