Abstract
Taking all kinds of affecting factors into account, the 10kV overhead line of distribution network lighting disaster risk is studied. Historical hidden fault, line equipment, topography, climatic conditions and social impact are selected as key factors of damage and the impact. The correlation among the factors and the weight ratio of each factor were studied. The risk assessment model of 10kV distribution network overhead line was established by multi-factor, hierarchical classification assessment method. It solves the evaluation index insufficient problem of the single factor as the evaluation condition, and provides the theoretical research and practical support to the 10kV overhead line reconstruction and the lightning prevention. The reliability and effectiveness of the research results have been proved by practical application in distribution network operation and maintenance control.
Highlights
With the rapid development of power system and the increasing level of management, distribution network management and safe operation work has been attached great importance, as directly to the power users to allocate electrical power network configuration, the efficiency of its operation directly affects the overall economic efficiency of the grid operation, So its safety and reliability more and more attention [1]
Lightning disasters as an unavoidable external disaster, to the safe operation of the grid has brought a lot of risk
In 1992, the US Electric Power Research Institute EPRI released a direct use of the US national lightning monitoring data for lightning protection overhead transmission line lightning performance simulation platform [2]
Summary
With the rapid development of power system and the increasing level of management, distribution network management and safe operation work has been attached great importance, as directly to the power users to allocate electrical power network configuration, the efficiency of its operation directly affects the overall economic efficiency of the grid operation, So its safety and reliability more and more attention [1]. Lightning disasters as an unavoidable external disaster, to the safe operation of the grid has brought a lot of risk. There are few researches on the safety risk of lightning damage. In 2007, China's North China Electric Power Research Institute and State Grid Power Research Institute for the first time put forward the lightning distribution map, and developed the relevant lightning protection standards [4]. Lightning has a high over-voltage amplitude, a shorter discharge time, insulated wire insulation layer can be high-voltage breakdown, causing the insulator flashover, at the same time, the frequency of freewheeling caused by air ionization [5,6,7]
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