The strength of the power frequency electric intensity and magnetic field of the 500-kV double circuit transmission lines was calculated by using the equivalent charge method and the Ampere's Law, and the environm...The strength of the power frequency electric intensity and magnetic field of the 500-kV double circuit transmission lines was calculated by using the equivalent charge method and the Ampere's Law, and the environmental impact factors of the fields were evaluated. By optimizing the phase sequence, the frequency electric intensity and magnetic field strength can be reduced. Within a distance of 25 m from the center of the transmission line, the power frequency electric intensity and magnetic field strength fall off sharply with the distance increase. Finally, the best phase sequence and the minimum ground clearance of the transmission lines were obtained to meet the requirements of the least impact on envionment.展开更多
In this paper a new methodological approach, life cycle cost assessment （LCCA）, is applied to evaluate the investment concerning a wind offshore plant location in Sicily East Coast. In particular, we analyze economi...In this paper a new methodological approach, life cycle cost assessment （LCCA）, is applied to evaluate the investment concerning a wind offshore plant location in Sicily East Coast. In particular, we analyze economic quantification of the damage deriving from the construction of the system, divided into environmental impacts deriving from the construction of a single turbine, and environmental impacts as a consequence of the construction of the foundations. The preliminary economic information for the LCCA analysis of the examined wind park offshore regards the management of the monetary capital initially invested, choice of the interest rate and of other necessary financial features, used to compute the net present value of the cash-flows accrued during the project lifetime. In this way, a more precise implementation of the LCCA in whatever type of structural investment is made possible, allowing the examination of all information useful for supporting the decision process.展开更多
文摘The strength of the power frequency electric intensity and magnetic field of the 500-kV double circuit transmission lines was calculated by using the equivalent charge method and the Ampere's Law, and the environmental impact factors of the fields were evaluated. By optimizing the phase sequence, the frequency electric intensity and magnetic field strength can be reduced. Within a distance of 25 m from the center of the transmission line, the power frequency electric intensity and magnetic field strength fall off sharply with the distance increase. Finally, the best phase sequence and the minimum ground clearance of the transmission lines were obtained to meet the requirements of the least impact on envionment.
文摘In this paper a new methodological approach, life cycle cost assessment （LCCA）, is applied to evaluate the investment concerning a wind offshore plant location in Sicily East Coast. In particular, we analyze economic quantification of the damage deriving from the construction of the system, divided into environmental impacts deriving from the construction of a single turbine, and environmental impacts as a consequence of the construction of the foundations. The preliminary economic information for the LCCA analysis of the examined wind park offshore regards the management of the monetary capital initially invested, choice of the interest rate and of other necessary financial features, used to compute the net present value of the cash-flows accrued during the project lifetime. In this way, a more precise implementation of the LCCA in whatever type of structural investment is made possible, allowing the examination of all information useful for supporting the decision process.
