Abstract
Because the causes of transmission line faults are not known clearly at present, this paper proposes fault classification for transmission lines, and analyses the characteristics of different faults. Using the transmission line faults data of southern coastal provincial power grid from 2007 to 2018, this paper analyses the influence and distribution of transmission line faults affected by lightning, typhoon, wildfire, foreign object and external damage. These five faults are the main factors affecting the safe and stable operation of transmission lines in this region. According to the different fault classification and statistical rules, the design standards for important transmission lines should be improved. Considering the factors of micro-topography, micro-meteorology and engineering cost, the inspection and maintenance of existing lines should be strengthened. The statistics and analysis will be helpful to the research, development and application of new theories, new technologies and new equipment in disaster prevention and reduction from the aspects of disaster prediction and monitoring.
Highlights
I N MODERN society, the basic engineering facilities that maintain the function of modern city and regional economy are defined as lifeline engineering system
According to the statistics and analysis of the operation data of 220-kV and above transmission lines in the past 12 years, the main failure factors that affect the safe operation of transmission lines are lightning, wind disaster, wildfire, foreign object and external damage
Lightning failure occurs from May to September and is the main cause of transmission line failure in the region
Summary
I N MODERN society, the basic engineering facilities that maintain the function of modern city and regional economy are defined as lifeline engineering system. Liang et al [3] took ultra high voltage direct current(UHVDC), high voltage DC and back to back HVDC system as the research object, conducted statistical analysis of forced outage, and illustrated the security situation faced by the HVDC system of state grid corporation of China combined with typical failure cases, analysed the weak links of existing systems and put forward relevant suggestions. This paper puts forward some suggestions for the predictable and unpredictable transmission line faults respectively This region studied in this paper is located in the southeast coast of China, the island across a strait in the southeast, with a total land area of 121,400 square kilometres, as shown in Fig..
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