雷擊事故的發生，國內外皆有所聞，當雷擊打到大樓時，如何將其突波電壓降至最低，達到完全的避雷，是各國所努力之方向。目前國內建築物之避雷針大部份都採用直接接地方式，而以建築物結構接地之情況則少之又少。

本論文主要研究分析建築物採直接接地及建築物結構接地之不同處，利用EMTP軟體架設八層樓之RC鋼筋混泥土建築物，以每段主鋼筋之樑或柱等效成一電阻及電感串聯之模組，進而組成一棟主鋼筋架構之大樓，其雷擊模組則採用Heilder型式之雷擊電流波形函數，探討雷擊對RC結構作接地之建築物突波電壓分佈。結果顯示，大樓之避雷針採用直接接地會比RC結構接地所得到的雷擊突波電壓值低，且雷擊突波電壓上升速率也較為緩和，對於設備及人員生命安全是提高了許多。再者，大樓內之三相電源(受電側)採用中性點接地比中性點不接地時，所得之突波電壓值也略微減低；而三相負載之引接方式(如Y接或Δ接)亦會影響注入大樓之雷擊突波電壓值大小。

The lightning strikes are natural phenomenon has been a major concern in every Countries. How to lower the surge voltage and complete lightning protection is the first consideration during building design and implementation. The lightning-protection rod of the building is grounded directly through the grounding conductor. It is seldom to ground the lightning rod via the steel structure of the building.

The thesis discussed the difference between direct-grounded method and building-steel-structure-grounded method. The construction is simulated with an eight floors Reinforce Concrete (RC) structure using EMTP software. Every section of the column and beam of steel structure is simulated with resistance and inductance. The lightning model of the Heilder-type is used to simulate the lightning current. Lightning surge voltage distribution on RC structure building grounding is studied in this thesis. The results show that surge voltage of direct-grounded method is lower than that of RC-structure- grounded method in terms of building lightning-protection rod. According to the advantages for direct-grounded method, the rising rate of surge voltages are lowered which are much more safe to mechanic equipment and working environment to employee.

Furthermore, the surge voltage of neutral grounded is lower than that of neutral non-grounded in a 3-phase power supply of building; meanwhile, the different connection of 3-phase-load, Y or Δ, will affect the surge voltage distribution when lightning strikes.

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