|
|
|
| Influence Mechanism of Dielectric Coated Electrodes on Metallic Particle Lift-Off in SF6 Gas under DC Voltage |
| Lü Fangcheng1, Liu Hongyu1, Li Zhibing2, Dong Meng1, Yan Xianglian2 |
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2. China Electric Power Research Institute Beijing 100085 China |
|
|
|
|
Abstract In order to study the influence mechanism of dielectrically coated electrode in SF6 gas under DC electric field on metallic particle lift-off, experimental platform was setup and motion trajectory was recorded by high-speed camera. The experiment results showed that with the increasing of SF6 gas pressures, the lift-off field of metallic particle was increased and the time to reach the high-voltage electrode was shortened. Instantaneous displacement of metallic particle was gained on the basis of image processing and computational method of charge quantity was raised on the combination of dynamics equation and least square method,analyzing of charge quantity showed that the metallic particle’s charge quantity decreased. Meanwhile, theoretical analysis model of field distribution around metallic particle under dielectric coated electrode was established, analyzing of electric field indicated that there was a enhance of electric field between coating and metallic particle and a transform of charge density distribution, which leaded to a downward polarization force for metallic particle. Both the decreasing of the electric charge quantity and the downward polarization force result in the increasing of lift-off field. On the whole, this article maintains that partial discharge is the charging mechanism of metallic particle; the enlargement of SF6 gas pressure brings about the raise of initial electric field of partial discharge, causing the increase of downward polarization force with higher electric field to lift-off.
|
|
Received: 01 December 2016
Published: 19 July 2017
|
|
|
|
|
|
[1] 乔胜亚, 周文俊, 唐念, 等. 不同吸附剂对GIS局部放电特征气体变化规律的影响[J]. 电工技术学报, 2016, 31(3): 113-120.
Qiao Shengya, Zhou Wenjun, Tang Nian, et al. Effects of different adsorbents on the evolving law of target gases under partial discharges in GIS[J]. Transactions of China Electrotechnical Society, 2016, 31(3): 113-120.
[2] 季洪鑫, 李成榕, 庞志开, 等. 电压波形对GIS自由金属颗粒放电特性的影响[J]. 电工技术学报, 2016, 31(13): 218-226.
Ji Hongxin, Li Chengrong, Pang Zhikai, et al. Influence of voltage waveforms on partial discharge characteristics of GIS mobilized metal particles[J]. Transactions of China Electrotechnical Society, 2016, 31(13): 218-226.
[3] Hama H, Okabe S. Factors dominating dielectric performance of real-size gas insulated system and their measures by dielectric coatings in SF 6 and potential gases[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2013, 20(5): 1737-1748.
[4] Srivastava K D, Tan M H E, Jaksts A, et al. Effect of dielectric coatings on metallic particle movement in compressed sulphur hexafluoride gas[C]//Annual Report, Conference on Electrical Insulation and Dielectric Phenomena, 1977: 448-455.
[5] Hama H, Inami K, Yoshimura M, et al. Dielectric properties of gas insulated bus applying low SF6 content and highly compressed N 2 /SF 6 gas mixtures[M]. New York: Gaseous Dielectrics IX, Springer US, 2001.
[6] Ooishi T, Hama H, Yoshimura M, et al. Charging mechanisms of a conducting particle on dielectric coated electrode in SF 6 gas[J]. Transactions Institute of Electrical Engineers of Japan, 1995, 115(6): 485- 491.
[7] 王健, 李庆民, 李伯涛, 等. 直流应力下电极表面覆膜对金属微粒启举的影响机理研究[J]. 电工技术学报, 2015, 30(5): 119-127.
Wang Jian, Li Qingmin, Li Botao, et al. Mechanism analysis of the electrode-coating's impact on the particle-lifting under DC voltage[J]. Transactions of China Electrotechnical Society, 2015, 30(5): 119- 127.
[8] Sakai K, Abella D L, Suehiro J, et al. Charging and behavior of a spherically conducting particle on a dielectrically coated electrode in the presence of electrical gradient force in atmospheric air[J]. IEEE Tansactions on Dielectrics and Electrical Insulation, 2002, 9(4): 577-588.
[9] 张乔根, 贾江波, 杨兰均, 等. 气体绝缘系统电极表面覆膜时金属导电微粒带电原因分析[J]. 西安交通大学学报, 2004, 38(12): 1287-1291.
Zhang Qiaogen, Jia Jiangbo, Yang Lanjun, et al. Charging mechanism of metallic conducting particle on a dielectrically coated electrode in gas insulated system[J]. Journal of Xi'an Jiaotong University, 2004, 38(12): 1287-1291.
[10] 王健, 李庆民, 李伯涛, 等. 考虑非弹性随机碰撞与SF 6 /N 2 混合气体影响的直流GIL球形金属微粒运动行为研究[J]. 中国电机工程学报, 2015, 35(15): 3971-3978.
Wang Jian, Li Qingmin, Li Botao, et al. Motion analysis of spherical conducting particle in DC GIL considering the influence of inelastic random collisions and SF 6 /N 2 gaseous mixture[J]. Pro- ceedings of the CSEE, 2015, 35(15): 3971-3978.
[11] 邢藏菊, 王守觉, 邓浩江, 等. 一种基于极值中值的新型滤波算法[J]. 中国图象图形学报, 2001, 6(6): 533-536.
Xing Cangju, Wang Shoujue, Deng Haojiang, et al. A new filtering algorithm based on extremism and median value[J]. Journal of Image and Graphics, 2001, 6(6): 533-536.
[12] 卢章平, 孔德飞, 李小蕾, 等. 背景差分与三帧差分结合的运动目标检测算法[J]. 计算机测量与控制, 2013, 21(12): 3315-3318.
Lu Zhangping, Kong Defei, Li Xiaolei, et al. A method for moving object detection based on back- ground subtraction and three frame differencing[J]. Computer Measurement & Control, 2013, 21(12): 3315-3318.
[13] 陈虎, 周朝辉, 王守尊. 基于数学形态学的图像去噪方法研究[J]. 工程图学学报, 2004, 25(2): 116- 119.
Chen Hu, Zhou Zhaohui, Wang Shouzun. Research based on mathematics morphology image chirp method[J]. Journal of Engineering Graphics, 2004, 25(2): 116-119.
[14] Savitzky A, Golay M J E. Smoothing and differentiation of data by simplified least squares procedures[J]. Analytical Chemistry, 1964, 36(8): 1627-1639.
[15] Pérez A T. Charge and force on a conducting sphere between two parallel electrodes[J]. Journal of Elec- trostatics, 2002, 56(2): 199-217.
[16] Nojima K, Zhang Xueqin, Matsuzaki H, et al. Suppression of metallic particle lift-off in GIS by a nonlinear resistivity coating[J]. Electrical Engin- eering in Japan, 2014, 188(1): 27-35.
[17] Parekh H, Srivastava K D, Van Heeswijk R G. Lifting field of free conducting particles in compressed SF 6 with dielectric coated electrodes[J]. IEEE Transa- ctions on Power Apparatus and Systems, 1979(3): 748-758.
[18] Hornfeldt S P. Lifting force on metallic particles in gis systems[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2006, 13(4): 838-841.
[19] Feng J Q, Hays D A. Electric field detachment of a uniformly charged dielectric sphere on a dielectric coated electrode[C]//Conference Record-IAS Annual Meeting (IEEE Industry Applications Society), 1996, 4: 1883-1890.
[20] Morcos M M, Zhang S, Srivastava K D, et al. Dynamics of metallic particle contaminants in GIS with dielectric coated electrodes[J]. IEEE Transa- ctions on Power Delivery, 2000, 15(2): 455-460.
[21] Ooishi T, Yoshimura M, Hama H, et al. Charging mechanisms of a conducting particle on dielectric coated electrode at AC and DC electric Fields[M]. New York: Gaseous Dielectrics VII. Springer US, 1994: 585-591.
[22] Prakash K S, Srivastava K D, Morcos M M. Movement of particles in compressed SF 6 GIS with dielectric coated enclosure[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 1997, 4(3): 344-347.
[23] Niemeyer L. A generalized approach to partial discharge modeling[J]. IEEE Transactions on Diele- ctrics and Electrical Insulation, 1995, 2(4): 510-528.
[24] Seeger M, Clemen M. Partial discharges and break- down in SF 6 in the pressure range 25-150kPa in non-uniform background fields[J]. Journal of Physics D: Applied Physics, 2013, 47(2): 202-215.
[25] Berger S. Onset or breakdown voltage reduction by electrode surface roughness in air and SF 6 [J]. IEEE Transactions on Power Apparatus and Systems, 1976, 95(4): 1073-1079.
[26] Eriksson G. Easy evaluation of streamer discharge criteria[C]//Proceedings of 2012 COMSOL Con- ference, 2012.
[27] Parekh H, Srivastava K D. Effect of avalanche space charge field on the calculation of corona onset voltage[J]. IEEE Transactions on Electrical Insu- lation, 1979, 14(4): 181-192. |
|
|
|
2017, Vol. 32 
