輸電網路故障定位技術之改善研究

Study and Improvement of Transmission Networks Fault Location Technique

趙敬昕(Ching-Hsin Chao)

指導教授 ： 劉志文

國立臺灣大學/電機資訊學院/電機工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201702866

摘要

本論文針對台灣電力公司345kV及161kV輸電網路中，諸多地下電纜與架空線路混合、多種架空（電纜）線徑組成之線路或三端線路架構等。利用台電架設的數位電驛原始波形資料，以改善目前商用數位保護電驛在事故發生時無法準確得出故障距離。
本文首先介紹已開發的故障定位演算法，藉由故障電流波形視窗區間的選擇使故障指標D值與故障距離更加精確。並分別針對雙端點與三端點的複合輸電線，介紹故障發生時如何判斷故障起始點及擷取故障間電壓電流資料，計算故障指標D值與故障距離，配合故障電流波形視窗區間分析求解不具穩態相量區間台電故障案例。
另外，本文研究探討單端開路情形下雙端輸電線及三端輸電線之故障定位，藉由單端開路下之故障定位演算法與MATLAB/SIMULINK模擬探討故障阻抗與故障距離精確度關係，更進一步結合雙端與三端輸電線故障定位程式，使整體故障定位系統更加完善。

關鍵字

台電輸電網路 ； 故障定位演算法 ； 單端開路下之故障定位演算法 ； 故障定位指標

並列摘要

Taiwan Power Company’s 345kV and 161kV transmission network are composed of underground cables , overhead lines, a variety of wire diameter and three-terminal transmission line structure . Usually, calculation of the fault location can use digital relay’s data but digital relay has huge fault location error. Therefore this paper through the intervals of the fault current waveform window to reduce the fault location error.
Developing the fault location algorithm by intervals of the fault current waveform window, we choose correct fault index D value to make fault distance more accurately. In two- terminal and three- terminal transmission line, this paper introduces how to use intervals of the fault current waveform window in fault location and to retrieve fault data of voltage and current.
In addition, this paper shows methods of under the one-terminal open circuit fault location, and discusses the relationship between fault impedance and accuracy of fault distance by one-terminal open-circuit fault location algorithm and MATLAB / SIMULINK simulation. Further combines the fault locator developed by the fault location technique to make the fault location system more perfect.

並列關鍵字

Taipower Compound Transmission lines ； Fault Location algorithm ； one-terminal open-circuit fault location ； Fault Location index

參考文獻

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[24] 林沛吟，『台電輸電線路故障定位平台之設計』，碩士論文，台灣大學，2010

[25] 黃敏瑞，『161kV輸電網路故障定位雲端平台之研製』，碩士論文，台灣大學，2015

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