近年來隨都市化的發展，架空輸電線因有礙市容、易受天災影響，且在建築林立之地區占據許多空間，輸電線遂逐漸地下化。地下電纜與架空線比較起來，由於電纜對地電容的差異，導致地下電纜在投切時所產生的開關暫態較劇烈，較易對線路上的設備造成影響，甚至超過設備的耐受程度而導致故障。
本論文以台灣一實際地下電纜系統為研究標的，建立不同的案例進行模擬與分析。首先，利用ATPDRaw電磁暫態分析軟體建立起完整的地下電纜系統模型，根據實際取得的系統參數輸入模擬程式中，力求模型之完整性與結果之正確性。接著，依不同的操作案例及系統狀態執行模擬，包含斷路器投入時間點及線路上有無裝設比壓器等，觀察模擬之結果進行分析。最後，討論三種降低開關暫態現象的方法，包含選擇最佳之斷路器投入角度、於三相均裝設線路比壓器以及裝設斷路器合匣電阻，並經由模擬加以驗證。期減少開關過電壓之衝擊，避免電纜及相關設備遭到破壞，亦可延長其使用壽命。

Following the development of urbanization in recent years, underground cables have gradually replaced overhead power cables. This is primarily because overhead cables obstruct cityscapes, are easily affected by natural disasters, and occupy substantial space in areas with numerous buildings. However, when compared to overhead cables, the capacitance to ground for underground cables produces comparatively more severe transients when switching. These intense transients tend to influence the cable equipment beyond it’s tolerance level, causing failure.
Based on an existing underground cable system located in Taiwan, numerous case samples were developed in this study for performing simulations and analyses. Electromagnetic transient analysis software (ATPDRaw) was used to establish a model of a comprehensive underground power cable system. Actual system parameters were then entered into the simulation program to determine the completeness of the model and the correctness of the outcomes. Subsequently, simulations were conducted based on different operation cases and system conditions, including the engagement time of the circuit breaker and whether line potential transformers were installed in the cable. The simulation results were then observed and analyzed. Finally, this study discuss three methods for reducing switching transients, including choosing the best switching angle, installing line potential transformers in all three phases and installing closing resistor. These methods endeavor to reduce the impact of overvoltage caused by switching, preventing damage to underground cables and other relevant equipment, thereby prolonging the cable lifespan.

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