Automatic matching-based power transmission line fault cause identification method

Abstract

The invention discloses an automatic matching-based power transmission line fault cause identification method. According to the method, line tripping and log book information is connected into and matched in a lightning locating system, so that the location of a lightning strike fault is judged; and the shielding failure and back striking lightning withstand levels of towers at each stage of a power transmission line are compared with the amplitude of lightning current, so that the nature of the lightning strike fault can be determined. With the method of the invention adopted, the tripping lightning fault of the power transmission line can be automatically identified, a technical basis is provided for the auxiliary decision-making of the post-disaster rapid processing of the lightning strike tripping fault, the application limitations of a method according to which the type of a fault can be diagnosed and the location of the fault can be determined only after line inspection is performed to search a fault point after a lightning strike fault occurs can be eliminated, the repair time and power resuming time of the power transmission line can be greatly shortened, and a large quantity of labor, material and time costs for detecting the fault can be saved.

Description

technical field [0001] The invention belongs to the technical field of state monitoring and fault diagnosis of electric equipment, and in particular relates to an automatic matching-based identification method for transmission line fault causes. Background technique [0002] The tripping of transmission lines is an important reason that affects the reliability of power transmission and transformation facilities, and the number of trips caused by lightning strikes accounts for more than 65% of the total number of trips of transmission lines with voltage levels of 110kV and above. At present, all provincial power grids have passed the lightning locating system (LLS) to monitor and store lightning information within the area, and use this to judge and find lightning fault points. The tripping of transmission lines directly affects the reliable supply of electricity that is related to the national economy and people's livelihood. In addition, lightning faults on transmission li...

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Problems solved by technology

[0003] On the one hand, the shielding is greatly affected by the lightning current amplitude and the protection angle of the lightning conductor, and the counterattack is greatly affected by the lightning current amplitude, the maximum steepness of the lightning current and the grounding grid resistance of the tower.

If it is impossible to determine whether the specific cause of the lightning strike is shielding or counterattack, it will be difficult to guide transmission line fault inquiry and formulate targeted lightning protection measures, which will also affect the safe and stable operation of the power system

On the other hand, although the lightning location system has been put into operation in various provincial power grids for many years, it is limited to timely monitoring and storage of lightning information within the area, and has not broken through the technical bottleneck in the intelligent diagnosis of lightning faults on transmission lines.

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