Title :
Laboratory investigation of impulse characteristics of transmission tower grounding devices
Author :
He, Jinliang ; Zeng, Rong ; Tu, Youping ; Zou, Jun ; Chen, Shuiming ; Guan, Zhicheng
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
fDate :
7/1/2003 12:00:00 AM
Abstract :
Reducing grounding resistance of a transmission tower grounding device is an important method to improve performance of transmission lines against lightning. Principles of impulse characteristics of grounding devices were discussed. Impulse experiments using grounding device models were systematically performed to analyze the influence of different factors on the impulse characteristics of grounding devices. During the experiments, soil resistivity was changed in the range of 100 to 5103 Ω·m. Effects of different parameters on impulse grounding resistance and impulse coefficients of different transmission tower grounding devices were discussed. Formulae to calculate impulse coefficients and power frequency grounding resistance of different grounding devices were obtained.
Keywords :
earth electrodes; electric resistance; electrical resistivity; lightning protection; poles and towers; power transmission protection; soil; grounding device models; impulse characteristics; impulse coefficients; impulse grounding resistance; lightning protection; power frequency grounding resistance; soil resistivity; transmission lines; transmission tower grounding devices; Conductivity; Frequency; Grounding; Helium; Laboratories; Lightning; Poles and towers; Power system simulation; Power transmission lines; Soil;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2003.813802
