Abstract
Surge arresters may represent an efficient choice for limiting lightning surge effects, significantly reducing the outage rate of power lines. The present work firstly presents an efficient numerical approach suitable for insulation coordination studies based on an implicit Crank–Nicolson finite difference time domain method; then, the IEEE recommended surge arrester model is reviewed and implemented by means of a local implicit scheme, based on a set of non-linear equations, that are recast in a suitable form for efficient solution. The model is proven to ensure robustness and second-order accuracy. The implementation of the arrester model in the implicit Crank–Nicolson scheme represents the added value brought by the present study. Indeed, its preserved stability for larger time steps allows reducing running time by more than 60 % compared to the well-known finite difference time domain method based on the explicit leap-frog scheme. The reduced computation time allows faster repeated solutions, which need to be looked for on assessing the lightning performance (randomly changing, parameters such as peak current, rise time, tail time, location of the vertical leader channel, phase conductor voltages, footing resistance, insulator strength, etc. would need to be changed thousands of times).
Highlights
Overhead power lines directly affect the reliable and safe operation of power grids
Transmission Lines (MTLs) needs to include protection for fast and slow front transient overvoltage stresses caused by lightning strikes [1,2,3,4] or switching since they can be critical for insulation and pose a danger to connected equipments [5]
To validate and test the proposed CN-FDTD approach, we simulated a lightning first strike impinging on the shield wire of an MulticonductorTransmission Lines (MTLs) with nominal voltage of 132 kV
Summary
Overhead power lines directly affect the reliable and safe operation of power grids. In consideration of their long distances and large capacity power transmission, insulation coordination of Multiconductor. If the energy absorbed by the MOVs exceeds their energy handling capability that is partially described by the line discharge class (event that can occur under direct strike), they will be damaged For this reason, the authors of [26] concluded that a correct coordination among MOV withstand capability, number of shield wires, and grounding resistance of arresters is necessary to limit permanent damage to surge arresters and obtain an effective lightning protection.
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