Electrical aging of insulation materials affects the reliability and security of pulsed power equipments. Based on the present pulsed source, the electrical tree initiation characteristic of epoxy resin is studied under different frequencies (1, 25, 50, 100, 300 and 500 Hz). The parameters of the pulsed source are as follows: peak voltage about 34 kV, rise time about 40 ns and half pulse width about 70 ns. The relationship between epoxy resin aging and voltage frequency is studied. Experiments demonstrate that tree initiation voltage decreases as frequency increases. The initiation voltage under positive pulse is higher than that under negative pulse. Insulation characteristic of E44 is better than that of PMMA. Factors influencing electrical tree initiation characteristic of E44 are discussed, and it is found that the effect of space charge is obviously strengthened under high frequency.
【1】刘锡三. 高功率脉冲技术［M］. 北京: 国防工业出版社, 2005.(Liu Xisan. High pulsed power technology. Beijing: National Defense Industry Press, 2005)
【2】李盛涛, 郑晓泉. 聚合物电树枝化［M］. 北京: 机械工业出版社, 2006.(Li Shengtao, Zheng Xiaoquan. Electrical tree of polymer. Beijing: China Machine Press, 2006)
【3】Shimizu N, Horii K. The effect of absorbed oxygen on electrical treeing in polymers［J］.IEEE Trans on Electr Insul,1985,29 (3):561-566.
【4】He J, Braun J M, Densley J, et al. Partial discharge characteristics of electrical trees in polymeric cable insulation［C］//IEEE 1994 Annual Report of Conference on Electrical Insulation and Dielectric Phenomena. 1994: 91-96.
【5】Cheng Yonghong, Chen Xiaolin, Rong Minghe, et al. Study on the partial discharge characteristics of the XLPE insulation samples during electrical treeing ageing［C］//Proc 7th Int Conf on Properties and Applications of Dielectric Materials. 2003.
【6】Fabiani D, Montanari G C, Dissado L A. Space charge accumulation due to ultra-fast charge packets in XLPE insulated cables: the effect of temperature and field［C］//Proc 9th Int Conf on Properties and Applications of Dielectric Materials. 2009.
【7】Vardakis G E, Danikas M G, Karafyllidis I. Simulation of space-charge effects in electrical tree propagation using cellular automata［J］. Materials Letters,2002,56(4):404-409.
【8】Fabian J H, Hartmann S, Hamidi A. Analysis of insulation failure modes in high power IGBT modules［C］//Conference Record of the 2005 IEEE Institute of Electrical and Electronics Engineers. 2005: 799-805.
【9】王洪新, 贺景亮, 李恪. 交流叠加冲击电压下XLPE绝缘中电树起始特性［J］. 高电压技术,1996,25(2): 3-5.(Wang Hongxin, He Jing-liang, Li Ke. Experimental study on the electrical tree inception characteristics of XLPE insulation under AC voltage and superimposed impulse voltage.High Voltage Engineering,1996,25(2): 3-5)
【10】Dissado L A, Fothergill J C. Electrical degradation and breakdown in polymers［M］.London: Peter Peregrinus Ltd, 1992.
【11】任浩, 王珏, 严萍, 等. 重频纳秒脉冲下有机玻璃电树枝老化特性的实验研究［J］. 电工电能新技术, 2008,27(4):32-34.(Ren Hao, Wang Jue, Yan Ping, et al. Study on electrical tree in PMMA under repetitive nanosecond pulses.Advanced Technology of Electrical Engineering and Energy,2008,27(4):32-34)
【12】王珏, 任成燕, 严萍, 等. ns脉冲下有机玻璃电树枝的引发特性［J］. 高电压技术, 2009,35(1):120-124.(Wang Jue, Ren Chengyan, Yan Ping, et al. Initial characteristics of electrical tree in PMMA under nanosecond pulses.High Voltage Engineering,2009,35(1):120-124)
【13】Champion J V, Dodd S J, Stevenst J C. Analysis and modeling of electrical tree growth in synthetic resins over a wide range of stressing voltage［J］.J Phys D: Appl Phys,1994,27(5):1020-1030.
【14】张东东, 严萍, 王珏. 40 kV ns脉冲发生器设计［C］∥2007中国电机工程学会高电压年会. 2007:1414-1416.(Zhang Dongdong, Yan Ping, Wang Jue. Design of a 40 kV nano-second pulse generator//CSEE-session 2007. 2007: 1414-1416)
【15】尹毅, 肖登明, 屠德民. 空间电荷在评估绝缘聚合物电老化程度中的应用研究［J］. 中国电机工程学报, 2002,22(1):43-48. (Yin Yi, Xiao Dengming, Tu Demin. An application of space charge in valuing the electrical ageing degree of insulation polymer.Proceedings of the CSEE,2002,22(1): 43-48)