本文選題：特高壓 + 隔離開關(guān)��； 參考：《高電壓技術(shù)》2014年12期

【摘要】：采用特高壓(UHV)隔離開關(guān)切合串補平臺時會產(chǎn)生隔離開關(guān)的重復(fù)擊穿和快速暫態(tài)過程,可能導(dǎo)致鄰近的電容式電壓互感器(CVT)發(fā)生故障。為系統(tǒng)研究該暫態(tài)過程,通過特高壓隔離開關(guān)切合串補平臺模擬試驗,測量了CVT上的過電壓水平、快速暫態(tài)電壓和電流波形,并分析了在CVT高壓端上加裝保護電阻和保護電感對快速暫態(tài)的抑制效果。試驗結(jié)果表明:隔離開關(guān)操作時,CVT端口最大過電壓約為1.54倍工頻試驗電壓峰值,遠(yuǎn)小于其雷電沖擊耐受電壓,不會對CVT造成嚴(yán)重威脅�？焖贂簯B(tài)電流振蕩主頻為500 k Hz,幅值可達(dá)2.2 k A,高幅值和高陡度的快速暫態(tài)電流可能會導(dǎo)致CVT內(nèi)部元件局部過熱,并產(chǎn)生局部過電壓,進而導(dǎo)致CVT損壞。在CVT高壓端加裝保護電阻和保護電感能有效限制快速暫態(tài)電流的幅值和陡度,對CVT具有較好的保護效果。
[Abstract]:When the UHV disconnector is applied to the series compensation platform, the repeated breakdown and fast transient process of the disconnector will occur, which may lead to the failure of the adjacent capacitive voltage transformer (CVT). In order to study the transient process systematically, the over-voltage level, fast transient voltage and current waveform on CVT are measured by using UHV disconnector to suit series compensation platform simulation test. The suppression effect of protection resistor and inductor on the high voltage end of CVT is analyzed. The test results show that the maximum overvoltage of CVT port is about 1.54 times the peak value of power frequency test voltage, which is far less than its lightning impulse withstand voltage, and will not pose a serious threat to CVT. The main frequency of the fast transient current oscillation is 500 kHz and the amplitude can reach 2.2 Ka. The high amplitude and high steepness of the fast transient current may cause local overheating and local overvoltage of the internal components of CVT, which will lead to the damage of CVT. Adding protective resistor and inductor to the high voltage end of CVT can effectively limit the amplitude and steepness of fast transient current, and it has better protection effect on CVT.
【作者單位】： 清華大學(xué)電機工程與應(yīng)用電子技術(shù)系電力系統(tǒng)及發(fā)電設(shè)備控制和仿真國家重點實驗室;中國電力科學(xué)研究院;
【基金】：國家電網(wǎng)公司科技項目(SGTGYJSFW[2012]304)~~
【分類號】：TM564.1

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本文編號：2101827