電壓互感器鐵磁諧振過(guò)電壓的研究
易成星,楊偉,朱文艷
南京理工大學(xué) 自動(dòng)化學(xué)院,江蘇 南京 210094
摘 要: 鐵磁諧振會(huì)產(chǎn)生過(guò)電壓現(xiàn)象,導(dǎo)致設(shè)備的絕緣破壞,影響系統(tǒng)的正常運(yùn)行。利用電壓互感器的伏安特性曲線分段擬合出鐵心的鐵磁特性曲線,采用MATLAB-SIMULINK 軟件對(duì)110 kV 變電站的電磁式電壓互感器與斷路器斷口電容串聯(lián)產(chǎn)生的鐵磁諧振進(jìn)行仿真分析;在此基礎(chǔ)上對(duì)消除此種鐵磁諧振事故的三種方法:使用電容式電壓互感器、拆除斷路器的斷口電容、采用伏安特性好的電磁式電壓互感器進(jìn)行仿真分析,結(jié)果表明三種方法都能達(dá)到預(yù)期目的。
關(guān)鍵詞: 鐵磁諧振;勵(lì)磁特性;電磁式電壓互感器;電容式電壓互感器;消諧措施
中圖分類號(hào): TM451 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2013)09-0020-04
Study on Ferromagnetic Resonance Overvoltage of Voltage Transformer
YI Cheng-xing, YANG Wei, ZHU Wen-yan
School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract: Ferromagnetic resonance will generate overvoltage phenomena to cause insulation damages of equipment and to impact on normal operation of the system. The volt-ampere characteristic piecewise curves were used to get the ferromagnetic curve of iron core. MATLAB-SIMULINK software was adopted to carry out simulation analysis for ferromagnetic resonance by connecting 110 kV substation electromagnetic voltage transformer with circuit breaker fracture capacitor in series. On the basis of this, three kinds of methods, including voltage transformer using capacitor, fracture capacitors demolishing circuit breaker and electromagnetic voltage transformer with good volt-ampere characteristics, were adopted to eliminate ferromagnetic resonance. The result shows that the three kinds of methods all can reach the expected goal.
Key words: ferromagnetic resonance; excitation characteristic; electromagnetic voltage transformer; capacitor voltage transformer; resonance elimination
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