國內同步輻射研究中心曾經發生加速器跳機與電子束不穩定的現象，懷疑係因地網內高頻訊號干擾加速器之儀控設備所導致，此現象與接地相關，遂於2002年底新建一個低於0.2 的地網，並針對加速器內隧道區、核心區的接地系統進行檢討、改善，此檢討、改善係根據經驗，雖作部份量測，但因未作模擬分析，缺乏理論驗證。本論文擬彌補此項缺失，針對新建地網以及隧道區的接地改善工程進行模擬，並與量測結果相比較，評估接地系統改善工程之效果。內容涵蓋兩部份：新建地網接地電阻之估算以及隧道區內接地改善工程對於抑制高頻雜訊干擾之成效。
上述新設地網峻工時，同步輻射研究中心曾使用「電位降法」量測此新設地網的接地電阻值，然未檢討此量測方法以及量測所得數值之意義，且未與利用傳統公式之計算結果相比較。對於高頻訊號干擾隧道區內真空腔之電子束，雖於接地系統改善工程峻工後，電子束已呈現穩定現象，但是否係因新設地網、是否係因隧道區內的接地改善工程、抑或因為其他未知因素而有此效果，在未進行模擬分析前實不得而知。
有鑑於此，本論文檢討傳統之地網接地電阻計算式，運用套裝軟體模擬近似「電位降法」，以計算新設地網之接地電阻值，並與傳統公式之計算結果，以及量測結果三者作比對。在高頻干擾部份，同樣利用套裝軟體建立隧道區內接地系統模型，模擬改善前後之新、舊地網電位差、電磁場強度等，並與實測結果作比較，分析接地改善之成效，另一方面亦用於評估上述地網模型、隧道區接地工程模型以及本研究採用之模擬方法的正確性。

Taiwan’s Synchronon Radiation Research Center (SRRC) located at Hsinchu has been suffered with the multitrips of accelerator and the instability of electronic beam. It is doubted that the phenomenon was caused by high frequency signals which disturb the control devices for the accelerator. Because the phenomenon has connection with grounding, SRRC built a new grid whose grounding resistance was designed to be lower than 0.2 , and also rebuilt the grounding system of accelerator. All the designs for rebuilt grounding system were based on experiences without theoretical analysis or any computational simulation. To overcome this difficulty, this thesis presents the computer modeling of both the newly built grid and the newly rebuilt grounding system of accelerator’s tunnel area, and presents the comparison results between computer simulation and field measurements. The presented are thus comprised of two major works: the modeling and simulation of grid and the evaluation results for grids ground-resistance; the investigation results on the effect of rebuilt tunnel’s ground system on the mitigation of stray current flowing on the vacuum chamber containing the electronic beam.
When the new grid was completed, the SRRC has applied the fall-of potential method to measure grid’s ground-resistance. However, neither has SRRC evaluated the actual meaning for the measurement method and measurement results, nor has SRRC compared the results with those by applying the conventional ground-resistance calculation formula. As to the high-frequency interference on the electronic beam of vacuum chamber, although after completion of the rebuilt grounding system, the instability of electronic beam has not been observed, it’s however not sure that this accomplishment was due to the new grid, the new tunnel grounding system or both or even other unknown reasons. Investigation and clarification are thus highly necessitated.
This study reviewed the conventional ground-resistance calculation formula, applied a commercial software to simulate the fall-of-potential method for ground-resistance measurement, and compared the measured with the calculated by both the formula and the software. Regarding the high-frequency interference, the author also formulated a computer model foe the grounding system of tunnel area and applied the model to simulating the voltage between the originally existing and the newly built grounding grids. As well as their magnetic field, with the support of measurement results, to evaluate the effectiveness of rebuilt ground system for the tunnel area. During the evaluation, the accuracy and limitation of grid model, tunnel ground system model as well as the modeling methods have also been investigated.

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