【摘要】：氧化鋅避雷器作為過電壓保護裝置,長期承受電網(wǎng)工頻電壓會產(chǎn)生老化受潮等問題,需要對其進行定期在線狀態(tài)監(jiān)測,當(dāng)電網(wǎng)電壓頻率發(fā)生擾動時,傳統(tǒng)避雷器在線監(jiān)測方法存在頻譜泄漏和柵欄效應(yīng),使得測量結(jié)果產(chǎn)生較大偏差。 針對這一問題,提出了一種將相位測量法與加窗插值諧波分析法相結(jié)合的測量泄漏電流新方法。通過對經(jīng)典余弦窗的仿真研究,選取了布萊克曼窗作為抑制頻譜泄漏的余弦窗,同時將余弦窗與雙峰插值算法相結(jié)合,通過仿真驗證了布萊克曼窗雙峰插值算法的優(yōu)越性和有效性,并通過仿真選取了最優(yōu)的硬件采樣參數(shù)。 結(jié)合國內(nèi)避雷器分布式監(jiān)測的現(xiàn)狀,本文設(shè)計了基于RS485總線的氧化鋅避雷器狀態(tài)在線監(jiān)測系統(tǒng),設(shè)計的監(jiān)測系統(tǒng)包括前端避雷監(jiān)測器、中端數(shù)據(jù)采集器以及后臺現(xiàn)場監(jiān)控中心上位機。監(jiān)測器以C8051F310增強型單片機為核心,能實現(xiàn)泄漏全電流、基波電流、三次諧波電流、阻性峰值電流以及容性峰值電流的測量。采集器以C8051F020單片機為核心,主要實現(xiàn)了485網(wǎng)絡(luò)的擴展以及監(jiān)測器數(shù)據(jù)的采集與傳輸工作。上位機設(shè)計包括了現(xiàn)場調(diào)試軟件和現(xiàn)場監(jiān)測軟件,能實現(xiàn)監(jiān)測器在線調(diào)試以及避雷器數(shù)據(jù)動態(tài)監(jiān)測、歷史查詢、故障定位等功能。 本文設(shè)計的避雷器在線監(jiān)測系統(tǒng)在11KV避雷器測試中運行良好,測試結(jié)果表明本系統(tǒng)設(shè)計準(zhǔn)確,能穩(wěn)定可靠運行,有效監(jiān)測避雷器狀態(tài)。
[Abstract]:Zinc oxide arrester, as an overvoltage protection device, will cause aging and damp under power frequency voltage for a long time, so it needs to be monitored on line periodically, when the voltage frequency of power grid is disturbed, There are spectral leakage and fencing effect in the traditional on-line monitoring method of arrester, which results in a large deviation of measurement results. To solve this problem, a new method for measuring leakage current is proposed, which combines the phase measurement method with the windowed interpolation harmonic analysis method. Based on the simulation of the classical cosine window, the Blackman window is selected as the cosine window to suppress the spectrum leakage, and the cosine window is combined with the bimodal interpolation algorithm. The superiority and effectiveness of the Blackman window bimodal interpolation algorithm are verified by simulation, and the optimal hardware sampling parameters are selected by simulation. Combined with the present situation of distributed monitoring of lightning arresters in China, an on-line monitoring system of zinc oxide arresters based on RS485 bus is designed in this paper. The monitoring system includes front-end lightning arresters. The middle end data collector and the upper computer of the background field monitoring center. The core of the monitor is C8051F310 enhanced single chip computer, which can measure the leakage full current, the fundamental current, the third harmonic current, the resistance peak current and the capacitive peak current. The C8051F020 MCU is the core of the collector, which mainly realizes the expansion of 485 network and the acquisition and transmission of monitor data. The design of upper computer includes field debugging software and field monitoring software, which can realize on-line debugging of the monitor, dynamic monitoring of lightning arrester data, history query, fault location and so on. The on-line monitoring system of the arrester designed in this paper runs well in the 11KV arrester test. The test results show that the system is accurate, stable and reliable, and can effectively monitor the state of the arrester.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM862

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