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Lightning is a major cause of power interruptions in power transmission lines. Nowadays the Leader Progression Model is an advanced method to evaluate the shielding failure probability of transmission lines. Calculating the surface electric field on phase conductors and ground wires precisely is important, because the surface electric field has great effect on the upward leader inception. In this...
Electro-Geometric Model (EGM) has been applied widely all over the world to evaluate the lightning shielding failure of transmission line. But with the increase of operation voltage to 1000 kV and tower height to more than 100 meters, some shortcomings of the traditional EGM model were found by many researchers. Leader Progression Model (LPM) was proposed to solve these problems. But some fundamental...
Companies need to understand how they are valued. The fundamental reason for this is that investors invest in companies that create the most value. Companies require investment to fund new business and to enable them to play a leading role in the globalization and consolidation of industries. Investors want to invest in the companies that will create the most value. If a company wants to create value,...
Accurate evaluation of the direct-strike lightning protection is a key point in the design of transmission lines, while how to properly describe the propagating progress of lightning leader determines the accuracy of lightning protection evaluation. Fractal model of lightning is adopted by some researchers due to its similarity in appearance to natural lightning, however, as a result of the randomness...
Shielding failure of lightning is the key problem for safe operation of UHV transmission lines. Taking the feature of 1000KV AC double circuit transmission lines into account, the leader progression method with proper criterion was employed. The lightning shielding failure rate of top phase, middle phase and bottom phase of two different transmission line tower types were compute, in three different...
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