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A time-domain method is presented to solve the dc ion flow field in bipolar transmission lines under which shielding wires are built to reduce the resultant electric field. In this method, the charge simulation method, the finite element method, and the finite volume method are used to solve the space-charge-free electric field, ion flow field, and current continuity equation, respectively. The method...
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...
The electromagnetic transients of lightning protection system (LPS) under direct lightning strike is studied using NEC2. By employing antenna return-stroke model, lightning channelpsilas inducing effect and finite conductivity of ground are all taken into account. Results show that the lightning channelpsilas inducing effect tends to decrease the current flowing through horizontal conductors, and...
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