過電流與測距電驛於輸電網路保護協調之研究

Exploring the Protective Coordination Problems of Overcurrent Relays and Distance Relays in Transmission Networks

鍾彰榮(Jarm-Long Chung)

指導教授 ： 周至如 ； 高文秀

國立臺北科技大學/電資學院/電機工程系所/博士(2009年)

https://doi.org/10.6841/NTUT.2009.00597

摘要

保護電驛所提供保護協調之良窳，攸關輸電網路系統供電安全與品質之優劣。過電流電驛是二次輸電與配電系統保護之主要電驛，在實務上常易發生上、下游保護協調曲線交叉的情形，因此，一旦下游發生故障，極可能造成大範圍停電之虞。此外，串接多個匯流排的單環或複雜低壓輸電網路，於輸電線發生故障時，會因過電流電驛動作時間過長而造成昂貴電力設備毀損的情形。測距電驛是超高壓及一次輸電網路系統的主要保護裝置，在實務上由於往往僅用輸電網路之線阻抗值核算電驛設定值，忽略了輸電網路故障電流對視在阻抗計算的影響，因而造成測距電驛無法達到預定的保護範圍。另一種可能是輸電線長度過短，導致線路阻抗值小於測距電驛最小的設定歐姆值時，亦會造成測距電驛的誤動作。本論文即針對上述過電流電驛及測距電驛用於超高壓及一二次輸電系統在實務上所遭遇到的問題加以探討，並提出適當方法以有效改善前述保護協調設計的問題。

關鍵字

過電流電驛 ； 測距電驛 ； 保護協調 ； 輸電網路

並列摘要

The protective coordination provided by protective relays in the transmission systems is important for power safety and quality. Overcurrent relays are mainly used in protecting the subtransmission and distribution systems. In practice, the coordination curve intersection of a downstream and upstream relay pair will cause unexpected augmentation of the blackout area as a fault occurs in the downstream relay side. In addition, in a single ring or a complex low voltage power transmission network with many buses cascaded, expensive power equipments would be damaged due to long operating times of relays when a fault occurs in a transmission line. EHV and HV transmission networks usually employ distance relays as protective devices. In practice, miscalculation of the apparent impedance and the short length of a transmission line are two major problems encountered in the distance relay protective coordination. In this thesis, these problems are investigated and the preceding protective coordination the novel approache mothod are proposed to effectively solve the improper coordination.

並列關鍵字

Overcurrent relay ； Distance relay ； Protective coordination

參考文獻

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