By R.D. Begamudre
The issues encountered with such excessive voltage transmission strains uncovered to nature are electrostatic fields close to the strains, audible noise, radio interference, corona losses, provider and television interference, excessive voltage gradients, heavy bundled conductors, keep watch over of voltages at strength frequency utilizing shunt reactors of the switched kind which inject harmonics into the approach, switched capacitors, over voltages because of lightning and switching operations, lengthy air gaps with vulnerable insulating houses for switching surges, ground-return results, and plenty of extra. the $64000 subject of EHV cable transmission as much as 1200 kV is gaining flooring with oil-filled, PPLP, XLPE, and SF6 insulation. The booklet covers all subject matters which are thought of crucial for figuring out the operation and layout of EHV ac overhead strains and Underground cables. Theoretical analyses of all difficulties mixed with sensible software are awarded intimately. EHV laboratory gear and trying out are totally coated including program of electronic recorders, fibre optics, and so on. for impulse measurements. each bankruptcy includes many labored examples so that it will illustrate and strengthen the idea. All examples are taken from functional events so far as attainable.
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The dimensions of a 3-phase 400-kV horizontal line, Fig. 72 cm. Calculate. (a) the matrix of inductances per km, for untransposed configuration, and (b) the same when there is complete transposition. 11 m 1 11 m 2 3 H = 15m Fig. 7 Solution. 177 mH/km. v. lines is in the neighbourhood of 1 mH/km. We observed that as the number of sub-conductors is increased, the geometric mean radius or equivalent 38 Extra High Voltage AC Transmission Engineering radius of bundle increases. Since req divides 2H in the logarithm, bundling will reduce the series inductance of a line, which will increase the power-handling capacity.
5 shows several examples of line configuration used in various parts of the world. They range from single-circuit (S/C) 400 kV lines to proposed 1200 kV lines. Double-circuit (D/C) lines are not very common, but will come into practice to save land for the line corridor. As pointed out in chapter 2, one 750 kV circuit can transmit as much power as 4-400 kV circuits and in those countries where technology for 400 kV level exists there is a tendency to favour the four-circuit 400 kV line instead of using the higher voltage level.
3. 2), draw on a graph the variation of P and I as the distance of transmission is varied from 200 to 800 km for (a) 400 kV line, and (b) 750 kV line. 1. 5 E2/Lx. Repeat for δ = 45°. 4. , for transmitting a power of 10,000 MW over 285 km, a voltage of 1150 kV was selected. , for transmitting a power of 5000 MW over 800 km, the same voltage level was selected. Give your comments on the reasons this level is most suitable and what the possible reasons are for such a choice. Discuss through% line loses by comparing with other suitable voltage classes that could have been found suitable.