本文關鍵詞：行波反射法電纜故障檢測關鍵技術研究　出處：《哈爾濱理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 行波反射法 小波降噪 電纜故障測距 電纜接頭 加權系數(shù)法

【摘要】：隨著經濟快速發(fā)展和城市規(guī)模逐漸增大，城市用電量逐年增加，供電安全對于保證城市的正常運行具有重要作用�？紤]到城市的美觀性，城市配電網越來越多的采用電纜代替原來的架空裸導線。由于電纜鋪設在地下，運行環(huán)境惡劣，加之復雜電磁環(huán)境的影響，當發(fā)生電纜故障時很難進行故障點排查。因此，準確、快速的檢測電纜故障，對于保證電力供電可靠性和穩(wěn)定性具有重要意義。 本文根據(jù)行波反射法理論進行了脈沖源、反射波起始點辨識和電纜接頭故障檢測的相關技術研究。首先，根據(jù)試驗需要設計了脈沖源，用于電纜開路、斷路和接頭故障檢測。其次，針對行波法檢測電纜故障時，高頻噪聲信號降低反射波起始點辨識精度的問題，本文在研究傳統(tǒng)小波降噪的基礎上，提出了改進加權系數(shù)法對信號進行降噪處理。改進加權系數(shù)法降噪效果明顯，但是計算量大，需要借助PC機進行運算，不適于在以單片機為內核的移動設備上運行，為此提出了曲線擬合法進行反射波起始點的辨識，通過對反射波上的特征點進行曲線擬合。最后，針對傳統(tǒng)電纜接頭只能檢測單一接頭的不足，，提出了采用行波法進行電纜接頭故障檢測，并進行了相應試驗。 采用行波法對接頭進行檢測不僅擴大了行波法檢測電纜故障的使用領域，而且為電纜接頭故障檢測領域提供了新的方法。本文通過對電纜故障檢測關鍵技術的研究，解決了電纜故障檢測的難點，為電網快速恢復供電，保證電網安全可靠運行提供了技術支持。
[Abstract]:With the rapid development of economy and city scale increases gradually, city consumption increased year by year, the safety of power supply plays an important role in ensuring the normal operation of the city. Considering the appearance of the city, by more and more city cable distribution network to replace the original bare overhead conductor. The cable laying on the ground, harsh working environment, and because of the complex influence the electromagnetic environment, when the cable fault is difficult for fault investigation. Therefore, accurate and rapid detection of the cable fault, it is of great significance to guarantee the power supply reliability and stability.
This paper according to the pulse wave reflection method theory, research on related technology of reflection wave starting point identification and cable joint fault detection. Firstly, according to the need of the experiment of pulse source for open circuit breaker design, cable, connector and fault detection. Secondly, according to the detection of the cable fault traveling wave method, to reduce the reflected wave starting point identification accuracy the high frequency noise signal, based on the research of the traditional wavelet denoising, put forward the improvement method of weighted coefficient of noise in signal processing. The improved method of weighted coefficient and noise reduction effect is obvious, but the large amount of calculation, need to be calculated by means of PC machine, is not suitable for mobile devices running on the kernel in SCM, this paper proposes the curve fitting the identification of reflection wave starting point, through the curve fitting of the feature points of reflection wave. Finally, in view of the traditional cable connector can only detect single joint In this paper, the traveling wave method is used to detect the fault of the cable joint, and the corresponding test is carried out.
For joint detection not only expand the field of cable traveling wave fault detection by using the travelling wave method, and provides a new method for the field of cable joint fault detection. In this paper, through the research on the key technology of cable fault detection, to solve the problem of cable fault detection, power grid for the rapid restoration of power supply, which provides technical support for safe and reliable operation of the power grid.

【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM855

【引證文獻】

相關期刊論文 前3條

1 劉榮海;馬朋飛;史騰飛;楊迎春;鄭欣;;電纜X射線檢測設備小型化研究[J];河北工業(yè)科技;2016年05期

2 彭小青;呂朦;;電力系統(tǒng)中故障測距方法綜述[J];科技廣場;2016年07期

3 陳榕斌;;供電電纜故障檢測與處理[J];智能城市;2016年07期

相關碩士學位論文 前2條

1 呂朦;PCB式羅氏線圈行波傳感器的研究與設計[D];東華理工大學;2016年

2 孔德武;電纜故障檢測技術智能化的研究[D];西安電子科技大學;2014年

本文編號：1408292