高壓六氟化硫斷路器觸頭間動態(tài)擊穿特性試驗研究
夏亞龍，林莘，徐建源，蘇安，王飛鳴
（沈陽工業(yè)大學 電氣工程學院，遼寧 沈陽 110870）
摘 要：針對六氟化硫(SF6)氣體在高壓電器設(shè)備實際形狀電極間的擊穿特性，搭建126 kV SF6斷路器觸頭間動態(tài)擊穿特性試驗回路，分別測量斷路器在不同電壓極性和滅弧室充氣壓強下分、合閘過程中觸頭間擊穿電壓，統(tǒng)計試驗擊穿點電壓值和對應(yīng)的開距，分別采用冪函數(shù)、四次多項式對分、合閘過程觸頭間擊穿點電壓值進行擬合，得到不同開距下?lián)舸╇妷簲M合曲線，并給出觸頭間擊穿電壓與開距之間的數(shù)學表達式。試驗結(jié)果表明：SF6斷路器分、合閘過程中，當觸頭間開距達到一定值后，SF6氣體表現(xiàn)出“反極性”效應(yīng)；同一開距下，分閘過程(平均速度9.6 m/s)擊穿電壓小于合閘過程(平均速度4.7 m/s)。
關(guān)鍵詞：六氟化硫；高壓斷路器；擊穿電壓
中圖分類號：TM561.3 文獻標識碼：A 文章編號：1007-3175(2016)04-0007-05
Experimental Study on Dynamic Breakdown Characteristics of Gap Between Contacts for High-Voltage SF6 Circuit Breaker
XIA Ya-long, LIN Xin, XU Jian-yuan, SU An, WANG Fei-ming
（School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China）
Abstract: For the breakdown characteristics of SF6 medium between the real shape electrodes for high-voltage electrical equipment, this paper set up the experimental circuit of dynamic breakdown characteristics of gap between contacts for 126 kV SF6 circuit breaker. The breakdown voltages were measured during the process of circuit breakers breaking and closing under different voltage polarity and arc extinguish chamber air inflation pressure respectively. Voltage value and corresponding opening travel of experimental breakdown point were recorded. The fitting curves of breakdown voltage under different opening travel were obtained by using power function and four order polynomial to fit the breakdown voltage value of breaking and closing process respectively. This paper gave the mathematical expression of breakdown voltage and distance between the contacts. The test results show that during the process of SF6 circuit breakers breaking and closing, the positive polarity breakdown voltage is greater than negative polarity of SF6 gas when the opening travel reaches a certain value and the breakdown voltage of breaking process (the average speed is 9.6 m/s) is lower than that of closing process (the average speed is 4.7 m/s) for the same contact gap.
Key words: sulfur hexafluoride; high-voltage circuit breaker; breakdown voltage
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