Hierarchy type multi-factor comprehensive assessment method for lightning damage risk state of overhead line of 10 kV distribution network

Abstract

The invention discloses a hierarchy type multi-factor comprehensive assessment method for the lightning damage risk state of an overhead line of a 10 kV distribution network. The method comprises the steps of collecting the lightning damage factor and the influence factor of the overhead line of the 10 kV distribution network; according to the collected lightning damage factor and the influence factor, calculating an index value; according to the calculated index value and a formula, calculating the lightning damage risk state value of each base tower in the overhead line of the distribution network; according to the index value and the formula, calculating the lightning damage risk state value of each section of the overhead line of the distribution network; according to the index value and the formula, calculating the lightning damage risk state value of the whole overhead line of the distribution network. According to the technical scheme of the invention, the lightning damage factor and the influence factor of the overhead line of the 10 kV distribution network are collected and then the lightning damage risk state of the overhead line of the distribution network is comprehensively evaluated according to a hierarchy type evaluation method from towers, sections to the whole line. Therefore, the lightning protection modification operation of the overhead line of the 10 kV distribution network is guided according to the obtained state evaluation result.

Description

technical field [0001] The invention relates to a 10kV distribution network overhead line safety technology, in particular to a hierarchical multi-factor comprehensive evaluation method for the lightning damage risk state of a 10kV distribution network overhead line. Background technique [0002] Due to the complex structure of the overhead lines of the 10kV distribution network and the low level of lightning resistance, the overhead lines of the 10kV distribution network are prone to fault tripping problems under the action of lightning induction, resulting in reduced power supply reliability and high-quality service complaints. Carry out lightning protection transformation to reduce the tripping rate of line lightning faults, but the characteristics of lightning suffered by different lines of 10kV distribution network overhead lines, different line sections of the same line, and different towers are different, and the risk impact of lightning tripping on different lines on ...

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Problems solved by technology

[0002] Due to the complex structure of the overhead lines of the 10kV distribution network and the low level of lightning resistance, the overhead lines of the 10kV distribution network are prone to fault tripping problems under the action of lightning induction, resulting in reduced power supply reliability and high-quality service complaints. Carry out lightning protection transformation to reduce the tripping rate of line lightning faults, but the characteristics of lightning suffered by different lines of 10kV distribution network overhead lines, different line sections of the same line, and different towers are different, and the risk impact of lightning tripping on different lines on the power grid is different , the risk impact of lightning tripping on the distribution network is different for the same line at a certain time and operation mode, and the overhead line of the 10kV distribution network has a long span and many poles and towers. Carrying out the research on the assessment method of lightning damage risk of overhead lines of distribution network cannot guide the targeted development of lightning protection reconstruction of overhead lines of distribution network, and cannot effectively reduce the tripping rate of lightning strike faults of overhead lines of distribution network

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