本文關(guān)鍵詞：變壓器真型實(shí)驗(yàn)平臺(tái)及內(nèi)置式特高頻傳感器研制　出處：《華北電力大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 變壓器 局部放電 特高頻 傳感器 應(yīng)用

【摘要】：電力變壓器作為電網(wǎng)中能量轉(zhuǎn)換和傳輸核心,為保證其安全可靠運(yùn)行,對(duì)變壓器內(nèi)部的絕緣狀況進(jìn)行在線監(jiān)測(cè)是很有必要的。變壓器內(nèi)部為油紙絕緣結(jié)構(gòu),其故障主要由局部放電引起的。特高頻(UHF)傳感器通過探測(cè)局部放電產(chǎn)生時(shí)向外輻射的電磁波,可以判斷變壓器內(nèi)部絕緣狀況。特高頻電磁波檢測(cè)具有抗干擾能力強(qiáng)、測(cè)量頻率高、頻帶寬、信息量大等優(yōu)點(diǎn),所以一直是研究局部放電在線監(jiān)測(cè)的熱點(diǎn)。本文建立了可以真實(shí)模擬220kV變壓器多種局部放電的實(shí)驗(yàn)平臺(tái),研發(fā)并通過實(shí)驗(yàn)室模擬小平臺(tái)系統(tǒng)試驗(yàn)驗(yàn)證了多種真實(shí)、可控的局部放電模型,并給出各類模型對(duì)應(yīng)放電的特征。通過該模型與變壓器真型平臺(tái)的配合,可以為特高頻傳感器的運(yùn)行、檢測(cè)等提供理論支持和平臺(tái)支撐。本文研究了幾款常用的內(nèi)置式特高頻傳感器,包括偶極振子天線、微帶天線和圓盤天線,在變壓器真型平臺(tái)上以圓盤天線為基準(zhǔn)對(duì)其性能進(jìn)行對(duì)比驗(yàn)證,得到幾款天線的適用范圍。并提出了兩款非傳統(tǒng)特高頻傳感器,電磁組合二重天線和共形天線,在理論研究之后對(duì)這兩款天線進(jìn)行了試驗(yàn)探究,得到推廣應(yīng)用這兩款天線的理論支撐。最后,本文定性的分析了UHF電磁波在變壓器內(nèi)部傳播衰減規(guī)律,并通過安置在變壓器真型平臺(tái)上的局部放電模型和特高頻傳感器驗(yàn)證其正確性,得到了滿意的結(jié)果。
[Abstract]:Power transformer is the core of energy conversion and transmission in power network. In order to ensure its safe and reliable operation, it is necessary to monitor the internal insulation of transformer on line. The transformer is oil-paper insulation structure. The fault is mainly caused by partial discharge (PD). UHF UHF sensor detects electromagnetic waves emitted when partial discharge occurs. UHF electromagnetic wave detection has many advantages, such as strong anti-interference ability, high frequency, frequency bandwidth, large amount of information and so on. Therefore, it has been a hot spot to study partial discharge on-line monitoring. In this paper, an experimental platform is established to simulate a variety of partial discharges of 220 kV transformers. A variety of real controllable PD models are developed and verified through the laboratory simulation of small platform system tests. The corresponding discharge characteristics of each model are given. The model is combined with the true transformer platform. It can provide theoretical support and platform support for the operation and detection of UHF sensors. In this paper, several commonly used UHF sensors, including dipole dipole antenna, microstrip antenna and disk antenna, are studied. The performance of several antennas is compared and verified by using disk antenna as reference on the true transformer platform, and two kinds of non-traditional UHF sensors, electromagnetic combined dual antenna and conformal antenna are proposed. After the theoretical research, the two antennas are tested and explored, and the theoretical support for the popularization and application of the two antennas is obtained. Finally, the attenuation law of UHF electromagnetic wave propagation in the transformer is analyzed qualitatively in this paper. The correctness of the model is verified by the partial discharge model and UHF sensor installed on the true platform of transformer, and the satisfactory results are obtained.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM41

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本文編號(hào)：1364109