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Research on the Induced Overvoltages in Electric Transmission Lines by Directly Lightning Striking on Tower

Author: YanFei
Tutor: LinFuChang
School: Huazhong University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: Induced overvoltage Numerical calculation Offset field method Software simulation Influencing factors
CLC: TM862
Type: Master's thesis
Year: 2006
Downloads: 308
Quote: 1
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Overvoltage caused by lightning strikes in the power system , to produce one of the main reasons of the accident . With the improvement of power system voltage levels , China's current procedures recommended induction overvoltage formula has not correctly reflect the actual situation , derivation and to determine realistic induction overvoltage calculated waveform function as anti- Ray calculations and mine design basis . This paper for lightning tower , over-voltage induced in the wire size and waveform . Theory point of order method, loop method , offset field method including a variety of induction voltage calculation methods and their characteristics . Details of the theory and calculation of the offset field method , and this method as the theoretical basis for the development of the induced voltage digital simulation software , the software is able to calculate the different structure towers in different lightning shed lightning induced overvoltage . Calculated considering uplink pilot studies have shown that the length of the upward leader of the induced voltage , the induced voltage of one of the important factors affecting . Different lightning parameters and tower parameters of the induction voltage amplitude and waveform are discussed , including the main discharge speed, lightning current peak uplink pilot length , grounding resistance . Final curve fitting , numerical calculation , derived the lightning tower induction voltage waveform function . The waveform function can be used to lightning calculation and to calculate lightning over-voltage and can be combined with EMTP-ATP simulation software .

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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