本文選題：電力電纜　切入點：行波　出處：《長沙理工大學》2009年碩士論文　論文類型：學位論文

【摘要】： 電力電纜在電力系統(tǒng)中應(yīng)用廣泛,由于電纜絕緣老化、受潮以及機械損傷等因素,隨著運行時間增長,故障發(fā)生概率有逐年增加的趨勢。因此,對電纜故障點在線檢測具有迫切的現(xiàn)實意義。本課題旨在通過對電力電纜故障點測距常用方法和技術(shù)進行分析和比較,探索易于進行在線檢測的方法和技術(shù)實現(xiàn)方法。 本文以35kV交聯(lián)聚乙烯絕緣電力電纜為原型,用ATP/EMTP建立了一個電力電纜系統(tǒng)仿真模型,并用該模型仿真了不同接地方式下的故障電流行波波形特征,分析了多種因素對故障行波的影響。故障分析過程中采用小波變換局部模極大值的方法檢測故障行波的突變點特征,通過小波的故障點奇異性判據(jù)判斷是否發(fā)生故障,并采用合適的測距算法來計算故障點距離。 為了實現(xiàn)電纜故障點的在線檢測,本文完成了電力電纜故障點在線監(jiān)測系統(tǒng)的軟硬件設(shè)計。硬件部分主要包括DSP工作電路設(shè)計、信號調(diào)理電路設(shè)計、A/D轉(zhuǎn)換電路設(shè)計、電源模塊電路設(shè)計、時鐘電路以及復位電路設(shè)計。軟件部分完成了基于DSP系統(tǒng)的小波算法,以及基于GPRS的無線數(shù)據(jù)傳輸工作流程設(shè)計。 電纜端頭一般都不在變電站內(nèi),安裝在電纜端頭的監(jiān)測裝置所測試的數(shù)據(jù)要采用通信技術(shù)才能及時傳輸?shù)阶冸娬尽１疚牟捎霉睪PRS無線通信技術(shù)進行數(shù)據(jù)實時傳輸,將非變電站內(nèi)的電纜故障點檢測數(shù)據(jù)信息及時傳輸?shù)阶冸娬菊{(diào)度中心。采用GPRS技術(shù)進行通信的優(yōu)點是不用組網(wǎng),按流量計費,終端可長時間掛接在網(wǎng)上,通信成本低廉。利用SIM100模塊對GPRS無線數(shù)據(jù)傳輸性能進行了試驗,試驗結(jié)果顯示數(shù)據(jù)傳輸準確可靠。本文從電力電纜故障點檢測方法和在線檢測實現(xiàn)方法兩個方面論述了對電纜故障點進行快速診斷的可行性。
[Abstract]:Power cable is widely used in power system. Due to the aging of cable insulation, damp and mechanical damage, with the increase of running time, the probability of failure is increasing year by year. The purpose of this paper is to analyze and compare the common methods and techniques of power cable fault point location, and to explore the methods and techniques that are easy to carry out on-line detection. In this paper, using 35 kV XLPE insulated power cable as prototype, a power cable system simulation model is established by using ATP/EMTP, and the characteristics of fault current traveling wave waveform under different grounding modes are simulated. The influence of many factors on the fault traveling wave is analyzed. In the process of fault analysis, the local modulus maximum of wavelet transform is used to detect the characteristic of the abrupt point of the fault traveling wave, and the singularity criterion of the fault point of the wavelet is used to judge whether the fault occurs or not. An appropriate location algorithm is used to calculate the fault point distance. In order to realize the on-line detection of cable fault points, the hardware and software design of on-line monitoring system for power cable fault points is completed in this paper. The hardware part mainly includes the design of DSP working circuit, the design of signal conditioning circuit and the design of A / D conversion circuit. Power module circuit design, clock circuit and reset circuit design. The software part completes the wavelet algorithm based on DSP system and the design of wireless data transmission workflow based on GPRS. The data tested by the monitoring device installed in the terminal of the cable are usually not in the substation, and the data can be transmitted to the substation in time only by using the communication technology. This paper adopts the public GPRS wireless communication technology to transmit the data in real time. The data of cable fault point detection in non-substation is transmitted to the substation dispatching center in time. The advantage of using GPRS technology to communicate is that the terminal can be connected to the network for a long time without netting and charging according to the flow rate. The communication cost is low. The performance of GPRS wireless data transmission is tested by using SIM100 module. The test results show that the data transmission is accurate and reliable. This paper discusses the feasibility of fast diagnosis of power cable fault points from two aspects: detection method of power cable fault point and realization method of on-line detection.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2009
【分類號】：TM755

【參考文獻】

相關(guān)期刊論文 前7條

1 張曉波;蘇黎明;李剛;陶佰睿;;基于GPRS網(wǎng)絡(luò)的可靠數(shù)據(jù)傳輸?shù)难芯考捌鋺?yīng)用[J];齊齊哈爾大學學報;2006年01期

2 盛月桂;;中壓電網(wǎng)中性點接地方式分析[J];上海電力;2004年04期

3 徐丙蓮,羿旭明;基于小波變換的信號奇異性分析[J];數(shù)學雜志;2004年06期

4 張兆寧,廖一原,劉峽,張祖勝,喻文煥;緩變信號奇異性的小波變換檢測及其應(yīng)用[J];系統(tǒng)工程理論與實踐;2000年10期

5 劉嫣;汪梅;楊存軍;;一種新的電纜單端故障測距方法研究[J];儀器儀表學報;2006年S1期

6 任偉建,康朝海,于鏑,張正輝;小波變換在信號奇異性檢測中的應(yīng)用[J];自動化技術(shù)與應(yīng)用;2005年01期

7 覃劍,陳祥訓,鄭健超,吳成琦;利用小波變換的雙端行波測距新方法[J];中國電機工程學報;2000年08期

，

本文編號：1580324