| The existing multi-conductors system modeling method is based on the quasi-static partial element equivalent circuit method without considering the delay. In practical application, it is found that this model is not accurate enough. Because only when the electromagnetic wave is larger than the geometrical size of the conductor, the propagation time of the electromagnetic wave can be neglected. For objects that do not meet the conditions, the PEEC model needs to consider the propagation delay, that is the full wave PEEC method,otherwise it will lead to inaccurate calculation results.So combine with National Natural Science Foundation project "Fast Time Domain Electromagnetic Transient Simulation Technology of the Large Scale Multi-conductors System"(51407073).By comparison with other electromagnetic field numerical calculation methods to determine the full wave PEEC method to be employed in this issue, and given the advantages of using partial element equivalent circuit.The transient calculation is the basis of transient electromagnetic calculation in the lightning protection system. Currently, most methods are solved in the frequency-domain, however, a time domain method is preferred. In this paper, a time domain model to calculate the transient current of the building lightning protection system is proposed based on the Full Spectrum Convolution macro-modeling(FSCM) Partial Element Equivalent Circuit(PEEC) method combined with the modified image method(MIM). MIM-FSCM-PEEC model can fully consider the delay effect of the coupling among the conductors, so that it has a high precision in the analysis of the voltages and branches currents. In order to validate the accuracy of the proposed model, comparison is implemented between the simulation results of the proposed model with the experimental results, the quasistatic PEEC method or CDEGS, which show that the model of this paper’s model are more accurate compared with the quasistatic-PEEC method. Since this method is a time domain calculation model, while CDEGS is a computational method in the frequency domain, time domain model has a strong advantage in dealing with nonlinear problems, and at the same time, it can be applied to model the ground and underground conductors system alone or in combination.Apply MIM-FSCM-PEEC methods on building lightning protection system(LPS) characteristics study. Calculate and analyze different lightning current waveforms, not to consider mutual improving inductance(mutual improve potential coefficient), different segmented structure, different conductor radius, different soil resistivity of LPS characteristics. This provides a basis for design of the building... |
