地下電力電纜檢測及故障位置測尋研究

Study of Underground Power Cable Detection and Malfunction Location Investigation

潘涵暉(Han-Hui Pan)

指導教授 ： 邱國珍

國立虎尾科技大學/電機資訊學院/電機工程系碩士在職專班/碩士(2017年)

摘要

電力系統的可靠度是國家經濟發展的重要一環，現今工商業迅速發展的時代裡，對電力的依賴更是日與俱增。由於地下電力電纜與架空線路比較有極大的優越性，不過當地下電力電纜突發性故障時，對於精準、迅速的緊急故障排除，卻是一個很棘手的工作。有鑑於此，本論文針對交連聚乙烯(Cross-Linked Polyethylene)為絕緣體之電力電纜，簡稱為XLPE電力電纜，進行週期性檢測試驗與突發性故障點位置量測、尋找及定位。內容包括XLPE電力電纜相關構造及特性、發生故障的原因和類型，接著完成電氣性與非電氣性檢測試驗，最後實地進行故障點位置量測、尋找與定位方法。首先日常週期性檢測項目有：導體直流電阻測定、紅外線熱影像儀器量測、絕緣電阻量測及極化指數、部分放電試驗及交流耐壓試驗，將可評估XLPE電力電纜的剩餘壽命之趨勢分析。最後，實地進行突發性故障點位置量測、尋找及定位，主要探討三種定位方法如下：低電壓脈衝反射法、電橋定位測距法及二次脈衝定位法。當突發故障時，首先須量測故障點阻抗的數值來判別故障型態，再進行故障點位置量測、尋找及定位，應用二次脈衝定位法實地量測之誤差率為1.29%，是三種定位方法中最低者，若將該方法，應用於維護現場電力輸配電系統，將可提升供電可靠度及電力品質，並可大幅降低事故風險。

關鍵字

XLPE電力電纜 ； 架空線路 ； 週期性檢測試驗 ； 突發性故障點量測定位

並列摘要

The reliability of power system is an important part of national economic development, and in the era of rapid development of industry and commerce, the dependence on electricity is increasing. The underground power cables have greater advantages than overhead lines, but when the former suddenly fails to operate correctly, it will be a very thorny task to execute emergency troubleshooting accurately and rapidly. In view of this, this paper aims to implement the periodic investigation of cross-linked polyethylene (Cross-Linked Polyethylene) for the power cable insulation, also known as XLPE power cable, and the measuring, discovering, and locating abrupt fault points, including the structure and characteristics of the XLPE power cable, the cause and type of failure, then the completion of the electrical and non-electrical test, and at last, the field experiment of the fault location measurement, search and positioning methods. The periodic inspection items which assess the remaining life of XLPE power cables include： DC resistance of the conductor, infrared thermal image instruments, insulation resistance, polarization index, partial discharge test and AC voltage withstand test. As to the field experiment of sudden fault location measurement, search and location, the present study mainly discusses three positioning methods as follows：low-voltage pulse reflection method, bridge positioning method and second pulse positioning method. When malfunction occurs, first the value of the fault point impedance should be measured to determine the fault pattern, and then the fault location measurement, searching and positioning are carried out. The study shows the error rate of the second pulse positioning method is 1.29%,the lowest among the three positioning methods, so if it is applied to maintain on-site power transmission and distribution system, not only can it improve the reliability of power supply and quality, but also significantly reduce the risk of accidents.

並列關鍵字

XLPE power cable ； overhead lines ； periodic testing ； measurement point of sudden fault

參考文獻

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[3]IEEE standard 400.2－2013，“Guide for Field Testing of Shielded Power Cable Systems Using Very Low Frequency. ”

[4]IEEE standard 400－2001，“IEEE Guide for Field Testing and Evaluation of the Insulation of Shielded Power Cable Systems.”