Method for electric power line lightning protection configuration by using electric network lightning disturbance distribution

Abstract

The invention relates to a method using lightning disturbance distribution to carry out lightening protection configuration of the transmission line, which adopts a computer to processing to the lightening automatic monitoring data, establishes a database and uses a geographical information system and the database as an analysis platform; the method also adopts a grid method to compute lighteningparameters and sets an amplitude range for dangerous lightning currents of the lightening disturbance of the objects according to the lightning stroke against ability and the characteristics of groundobjects, and acquires the correspondent lightning disturbance distribution according to the amplitude range for dangerous lightning currents and the lightening data computed by the computer; by adopting the reliable index in operation confirmed by the transmission line and the statistic data of the lightning stroke flashover types, the method sets critical density value in the lightning disturbance distribution which can cause lightning strike flashover: the method computes the scale and distribution of the lightning disturbance based on the critical density value and confirms the lightning-proof configuration of the transmission line based on the scale and distribution of the lightning disturbance. The invention can be adopted to judge the correspondent area and probability of 'shieldingfailure flashover' and 'back flashover' of the transmission line and can effectively configure the correspondent lightning-proof measures of the transmission line based on the characteristics of thetwo lightning disturbances, thus improving the performance-price ratio.

Description

technical field [0001] The invention relates to lightning protection technology for transmission lines, in particular to a method for lightning protection configuration of transmission lines by utilizing lightning damage distribution. Background technique [0002] Lightning protection configuration is the necessary protective measures and technical means to make overhead lines effectively deal with lightning strikes. The lightning protection configuration of existing transmission lines is mainly in accordance with the method recommended by the current power industry regulations "Overvoltage Protection and Insulation Coordination of AC Electrical Installations" (DL / T620-1997), that is, according to the definition of lightning days manually recorded by the Meteorological Department for a long time According to the intensity of lightning activity, the lightning protection configuration is determined in combination with the insulation structure of the transmission line. In terms...

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Problems solved by technology

The results of engineering tests prove that this method has obvious shortcomings: "thunder day" itself cannot fully characterize the characteristics of lightning activities, that is, a thunder day cannot fully represent the frequency of specific lightning occurrences, so its guiding role is very limited; in recent years, it has gradually Using the ground flash density (fl / km) to characterize the lightning distribution 2 / a) to replace the lightning day, the applicant found in the research that due to the structural characteristics of the power grid itself and the insulation characteristics represented, not all lightning may cause flashover of high-voltage overhead transmission lines, but only some of them are called dangerous Lightning can cause flashover of high-voltage overhead transmission lines; the actual distribution of this part of lightning that is harmful to the power grid is not equal to the distribution of ground flash density; the above two methods cannot correctly express the possible "counterattack" and Two types of lightning accidents, "shielding", that is, it is impossible to determine the area corresponding to the "shielding flashover" caused by the shielding failure of the lightning conductor and the "counter-attack flashover" caused by lightning strikes on the lightning conductor or the tower top, and the occurrence of lightning damage probability, and it is impossible to configure the lightning protection measures required for the corresponding transmission lines corresponding to the two lightning hazard characteristics, so that the cost performance of lightning protection measures has always been very low.

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