Study On Lightning Protection Of 110kV Transmission Line Of Yanan

An essential link for transmission in power system,with China’s rapid economic development,improve the transmission line voltage regardless of the transmission,task 110kV transmission line has been basically no longer as the long distance,high power,it becomes the main ring city distribution network festival and construction of the high quality grid with the coexistence of economy and rationality.The transmission line height rising,has gradually developed a double circuit on the same tower,four different ways such as line,but also closer to the mountains and other less deserted places.And this way of erection is no more than a higher requirement for the safe operation of transmission lines.Among many factors that affect the safe and stable operation of transmission lines,lightning strikes are always the main reasons.Therefore,lightning protection measures for 110kV transmission lines need to be studied.The correct understanding of lightning and lightning discharge classification form,of thunderstorm and lightning hours parameters of lightning activity and characterization of frequent degree,flash density to represent ground lightning probability.The mechanism and parameters on the understanding of lightning,lightning protection lightning mathematical model,established the equivalent circuit of Peterson voltage source and current source based on.At the same time on the lightning overvoltage mechanism and calculation model,established the model of transmission line lightning protection and lightning arrester.Including methods,studied several can improve the lightning protection ability of transmission lines:reduce the grounding wire protection angle,reducing grounding resistance,the arrester installed,install and improve the insulation strength of coupling ground wire line.The design scope,introduced Yanan 110kV transmission line extension line of apricot geological situation,the environment and the protection measures for the design of apricot line extension using these data,that the use of high insulation of transmission lines and take full erection double ground and tower base by installing grounding mode can meet the standard of lightning protection circuit.