Rights of way for transmission circuits arc difficult to obtain in urban areas, and existing…

Rights of way for transmission circuits arc difficult to obtain in urban areas, and existing lines arc often upgraded by rcconductoring the line with larger conductors or by reinsulating the line for operation at higher voltage. Thermal considerations and maximum power which the line can transmit are the important considerations. A 138-kV line is 50 km long and is composed of Partridge conductors with flat horizontal spacing of 5 m between adjacent conductors. Neglect resistance and find the percent increase in power which can be transmitted for constant IVA and IVRI while 8 is limited to 45° (a) If the Partridge conductor is replaced by Osprey, which has more than twice the area of aluminum in square millimeters, (b) If a second Partridge conductor is placed in a two-conductor bundle 40 cm from the original conductor and a center-to-center distance between bundles of 5 m, and (c) If the voltage of the original line is raised to 230 kV with increased conductor spacing of 8 m.  

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