隨著科學技術之日新月異、經濟活動之蓬勃發展，當今社會對電力品質與供電安全越加重視，電力公司越加趨向採用以六氟化硫作為絕緣介質之氣體絕緣開關設備，其中包含匯流排、斷路器、分段開關、接地開關、比流器與比壓器等，不僅大幅縮減建置所需之空間，更提升維護之方便性與操作人員之安全。
為有效截止斷路器投切時造成之暫態過電壓，部分斷路器會特別加入極間電容之設計，然而，於斷路器啟斷時，極間電容會與斷路器後方之設備或負載形成迴路，導致斷路器後方之設備或負載仍存在某一程度之電壓。若恰好比壓器鐵心處於飽和狀態，鐵心之電感值呈現非線性變化，便容易與極間電容產生鐵磁共振，造成異常持續之過電壓與過電流，輕微影響為電力設備過熱，嚴重的話可能導致變壓器或比壓器絕緣破壞，引發匝間短路、設備燒損甚至停電事故。
綜觀上述，本論文旨在提出一個鐵磁共振分析策略，利用EMTP-RV電磁暫態分析軟體，搭配自行建置之模擬模型，分析斷路器啟斷時間點對鐵磁共振之影響，評估發生鐵磁共振時之暫態過電壓與過電流，研究鐵磁共振抑制器之抑制效果，針對不同鐵磁共振事故，方便相關工程人員模擬事故經過，加速發展解決方法，降低現場測試之時間與成本，提升電力可靠度與增進變電所運轉連續性。

With the rapid development of science, technology and economic activities, the society has paid more and more attention to the power quality and supply security. Electric power companies increasingly adopt the gas insulated switchgear (GIS). It uses SF6 as insulated materials and contains bus, circuit breakers, disconnect switches, earth switches, current transformers and potential transformers. The design of GIS not only greatly reduces the construction space, but also improves the convenience of maintenance and the safety of operators.
In order to effectively cut off the transient overvoltage caused by switching on, one solution is to connect a circuit breaker to a grading capacitance. However, while the circuit breaker opens, there will be a loop between the grading capacitance and the load. If and only if the core of the potential transformer is saturated, it is easy to happen ferroresonance, which causes the abnormally continuous overvoltage and overcurrent between the grading capacitance and the potential transformer. In some serious case, ferroresonance leads to insulation deterioration, short circuit, equipment damage or even blackout.
Therefore, this thesis aims to propose a freeoresonance analysis strategy. With the EMTP-RV software, the overvoltage and overcurrent of ferroresonance will be simulated. Different suppression methods will also be evaluated. For related engineering personnel, the strategy can provide a faster way to rebuild the process of ferroresonance faults, accelerate the search of solutions and enhance the reliability of power supply.

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