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- W965997176 abstract "In this diploma thesis the insulation capability of the transmission lines of the Greek transmission and distribution system of electric energy is studied, as well as their lightning behavior. Initially, there is a little historical background and it is also presented some details concerning the Greek transmission system. Afterwards a more detailed description of the transmission lines, showing the classifications in which they are subject to, with main criteria, the nominal voltage in which they are charged, the length, but also their ability of electricity transmission. Moreover, there is a reference to the stresses in which the lines are subjected to, as well as their insulation level and their characteristics. Next, there is a study about lightnings and it is provided a thorough presentation of the types of lightning and atmospheric discharges, moving afterwards to the reference of the main lightning features, the results that they rise, as well as the parameters that they depend on and described from. Below, we can see what the main types of outages in air transmission lines are and which are the causes that generate them. The next chapter deals with the isolation of lines the, as well as with lightning strokes. More specifically, the mechanisms which cause the overvoltages on transmission lines are described, making a special reference to the backflashover phenomenon on the insulation of the lines, and the proofing outage. Then, in order to determine the position of the line protection conductor, the maximum angle method as well as the electrogeometrical method are presented, while, in order to anticipate the likely number of outages due to backflashover the following two methods are represented : the simple and improved ANACOM method. Finally, the last chapter contains an extented reference to the ATP-EMTP program and its components, as well as its affiliate programs. This is because a simulation of a real line network of the electricity company is represented, the R-37 distribution line, which is located in the region of Lappa Achaia, with the use of this program and mainly its graphic preprocessor, which is the program ATPDraw. This simulation has been done for different intensities of lightning currents, which strike at the protection conductor or the phase conductor of the line at various points on the line and it is also studying overvoltages which are produced due to these lightning currents and the risk rate for the nearby service station, which is located in the same area." @default.
- W965997176 created "2016-06-24" @default.
- W965997176 creator A5088108046 @default.
- W965997176 date "2010-07-07" @default.
- W965997176 modified "2023-09-27" @default.
- W965997176 title "Διαβάθμιση μόνωσης των γραμμών υψηλής τάσης του ελληνικού συστήματος" @default.
- W965997176 hasPublicationYear "2010" @default.
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