由於一次變電所發生匯流排電驛動作時，將造成相關斷路器啟斷，有時甚至造成N-2之運轉情形，且可能導致變壓器超載跳脫，引發一次變電所全停，因此本研究之主旨即在於探討一次變電所之變壓器保護方式，同時分析一次變電所變壓器之電力潮流運轉情況，進而提出特殊保護方式之可行建議，俾供變電所執行適切之保護動作，以更有助於避免變電所發生全停事故，確保供電品質。
此外，本文也分析電力傳送發生極端偶發事故時之系統運轉情況，並以超高壓變電所為模擬主軸及針對變電所現階段遙控跳脫大型火力發電廠所施行之保護矯正效能，予以評估分析，期能儘早掌握可能發生之隱藏性故障，進而有助於減少大規模停電之發生。文中對於所使用之保護元件可靠度及可能發生之事故，均予以整體模擬，同時提出可行性之建議，期能對於電力系統供電可靠度之提昇，確有助益之處。

When the bus fault happens at primary substation, it may result in the trip of circuit breakers and lead to the scenario of N-2 operation, possibly causing the blackout of connected substations. In view of such significant consequence, the theme of this thesis lies in the investigation of transformer protection at primary substation as well as the analysis of power flows, by which a better scheme of special protection was suggested such that the event of substation blackout is anticipated to be largely reduced, hence maintaining the quality of supplying power.
Furthermore, the thesis also analyzed the operation under extreme contingency scenarios, in which the remote trip of large-scale thermal plant as a correction procedure of special protection was also assessed. It is expected that through enforcement of protection procedure, those hidden faults can be grasped such that the blackout can be better prevented. To confirm the feasibility of the proposed suggestions, simulations have been carried out for each assumed case, anticipating the method proposed in this thesis would serve as a useful reference to maintain the reliability of the supplying power.

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