【摘要】：局部放電檢測(cè)是及早發(fā)現(xiàn)電力設(shè)備的絕緣隱患的重要手段。對(duì)于開(kāi)關(guān)柜和氣體絕緣開(kāi)關(guān)(GIS)等金屬封閉式的電力設(shè)備，國(guó)內(nèi)的電力公司通常采用超聲波檢測(cè)法與地電波檢測(cè)法對(duì)其進(jìn)行巡檢。超聲波檢測(cè)法的技術(shù)原理較為簡(jiǎn)單，其原理已被深入研究，國(guó)內(nèi)外已有基于超聲波原理的成熟的產(chǎn)品，而基于地電波原理的局部放電檢測(cè)技術(shù)被該技術(shù)的發(fā)明企業(yè)EA Technology所壟斷。 人們對(duì)于地電波檢測(cè)技術(shù)的研究多是在技術(shù)運(yùn)用與數(shù)據(jù)挖掘等方面進(jìn)行的，對(duì)于地電波檢測(cè)方法的原理與基于地電波原理的檢測(cè)系統(tǒng)研制，仍有較多的難點(diǎn)有待解決，如：地電波傳感器的檢測(cè)原理、地電波定位技術(shù)的原理、暫態(tài)對(duì)地電壓(TEV)的產(chǎn)生機(jī)理等。 本文將對(duì)地電波檢測(cè)技術(shù)的原理和地電波定位技術(shù)的原理進(jìn)行深入研究，并設(shè)計(jì)出一個(gè)基于地電波原理的開(kāi)關(guān)柜局部放電檢測(cè)裝置。首先，，本文運(yùn)用電磁場(chǎng)與電磁波的相關(guān)理論知識(shí)進(jìn)行地電波檢測(cè)原理的研究，本文從局放電磁信號(hào)的產(chǎn)生機(jī)理、局放電磁波的折射與反射過(guò)程以及局放電磁波在開(kāi)關(guān)柜金屬外壁的衰減過(guò)程三方面著手進(jìn)行研究，給出了地電波的表達(dá)式和暫態(tài)地電壓信號(hào)的表達(dá)式，然后，本文對(duì)地電波在金屬表面產(chǎn)生暫態(tài)對(duì)地電壓的原理進(jìn)行電磁場(chǎng)仿真，研究TEV的衰減規(guī)律和地電波信號(hào)的特征，此外，課題對(duì)地電波定位技術(shù)進(jìn)行了深入研究，運(yùn)用軟件XFDTD進(jìn)行定位過(guò)程模擬和分析，最后，本課題將設(shè)計(jì)出一個(gè)地電波檢測(cè)系統(tǒng)，并將其運(yùn)用于廣州供電局的開(kāi)關(guān)柜的局放檢測(cè)，現(xiàn)場(chǎng)測(cè)試的結(jié)果表明本文設(shè)計(jì)的設(shè)備具有良好的性能。
[Abstract]:Partial discharge (PD) detection is an important means to detect insulation hidden danger of electric power equipment as early as possible. For metal enclosed power equipment such as switchgear and gas insulated switch (GIS), domestic power companies usually use ultrasonic detection method and ground wave detection method to inspect them. The principle of ultrasonic detection is relatively simple, and its principle has been deeply studied. There are mature products based on ultrasonic theory at home and abroad, while the partial discharge detection technology based on ground wave principle is monopolized by EA Technology, the invention enterprise of this technology. The research of ground wave detection technology is mostly carried out in the aspects of technology application and data mining. There are still many difficulties to be solved for the principle of ground wave detection method and the development of detection system based on ground wave theory. For example, the detection principle of ground wave sensor, the principle of ground wave localization technology, the generation mechanism of transient (TEV) to ground voltage, etc. In this paper, the principle of ground wave detection technology and the principle of ground wave positioning technology are studied in depth, and a switchgear partial discharge detection device based on ground wave principle is designed. First of all, based on the theory of electromagnetic field and electromagnetic wave, the principle of ground wave detection is studied, and the generation mechanism of partial discharge electromagnetic signal is discussed in this paper. The refraction and reflection process of partial discharge electromagnetic wave and the attenuation process of partial discharge electromagnetic wave in metal outer wall of switchgear are studied. The expressions of ground wave and transient ground voltage signal are given. In this paper, the principle of ground wave transient voltage on metal surface is simulated, and the attenuation law of TEV and the characteristics of ground wave signal are studied. In addition, the technology of ground wave localization is deeply studied. The software XFDTD is used to simulate and analyze the positioning process. Finally, a ground wave detection system is designed and applied to the local discharge detection of the switchgear of Guangzhou Power supply Bureau. Field test results show that the equipment designed in this paper has good performance.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM591

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