Large cross line total lighting strike tripping rate emulated computation method

Abstract

The invention relates to a simulation calculation method of total lightning stroke trip rate, in particular to the simulation calculation method of the total lightning stroke trip rate of a long-span circuit. The simulation calculation method of the total lightning stroke trip rate of the long-span circuit is based on a formula that: N is equal to N counter plus N shield; wherein, the N is the total lightning stroke trip rate of the long-span circuit, the N counter is the countering trip rate of the long-span circuit, and the N shield is the shielding failure trip rate of the long-span circuit, that is, the invention includes the simulation calculation method of the countering trip rate of the long-span circuit and the simulation calculation method of the shielding failure trip rate of the long-span circuit, the calculation method of the countering trip rate of the long-span circuit is based on an EMTP procedure, and the invention provides a complete simulation method by taking into consideration of the impacts of various factors such as pole tower wave impedance and wave speed, induction voltage component, air clearance flashover criterion, working voltage phase and ground line arc altitude.

Description

technical field [0001] The invention relates to a simulation calculation method of the total lightning strike tripping rate, in particular to a simulation calculation method of the total lightning strike tripping rate of a long-span line. Background technique [0002] The towers of long-span transmission lines are very high, and the probability of being struck by lightning increases significantly with the height, so the lightning protection problem has always been concerned. The lightning single-phase flashover probability of large-span lines is higher than that of conventional lines, and even multi-phase flashovers occur; multiple flashovers can cause permanent damage to insulator strings and their fittings, making repairs difficult and bringing danger to the safe and stable operation of the system. In order to properly design lightning protection measures and avoid long-span high towers from becoming the weak link of transmission lines, it is necessary to simulate and calc...

AI Technical Summary

Problems solved by technology

At the same time, there are also big problems in the calculation of induced overvoltage, which does not match the actual situation.

For the calculation of shielding, the voltage U=100I formed by lightning shielding on the wire is obviously low, and the influence of working voltage is not considered, which is inconsistent with the actual situation

[0006] Some scholars at home and abroad have conducted similar research, but most of the research is conducted on a certain problem in large-span lightning protection, lacking a comprehensive and systematic method, and there are many unreasonable places in the method

Images