In order to provide electricity from a newly established thermal power station to a metropolitan area of 270 MW connected load at a distance of 300 km, a new 3-phase, 50 Hz, high voltage overhead transmission system with a load power factor of 0.95 lagging needs to be erected. Design requirements: Analyze the possibilities of having either single circuit or double circuit and choose the most economical one subject to: ACSR bundled conductors are preferred The size of the conductor should be in such a way that it can withstand an excess current of 10%. condition The transmission efficiency needs to be above 85% The full load voltage regulation to be within 5% No constraint on the type of tower structure provided the overall cost should be minimum Technical Specifications: The phase sequence is ABC and the transmission line is completely transposed Surge impedance: 400 ohm for single circuit line and 200 ohm for double circuit line The line loadability is given in Fig. 1 For single circuit, the conductors are arranged as an equilateral triangle of each side 2 m and for double circuit, the conductors are arranged as shown in Fig. 2. Table 1 provides types of conductors and conductor data Table 2 gives the terrain specifications Table 3 provides transmission line base cost Table 4 depicts the Right of Way cost Please download the attached file.
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