1.Department of Electrical Engineering Tsinghua University Beijing 100084 China; 2.North China Electric Power Research Institute Co.Ltd Beijing 100045 China
Abstract For the partial discharge test of electrical equipment with large capacitance, the use of low-frequency voltage instead of power frequency voltage can effectively reduce the capacity requirements of test power supply. However the validity of partial discharge (PD) test under low frequency voltage needs to be evaluated. In order to investigate the influence of voltage frequency on corona discharge in the oil, the discharge test of the tip-plate electrode under the frequency from 50 Hz to 5 Hz was carried out based on the impulse current method. The results show that some of the main features of corona in the oil under low frequency do not change. The magnitude of discharge in positive half cycle is obviously larger than that in negative cycle. The discharge mainly distributes around the peak value of the voltage and forms a mountain shape, which becomes vague under low frequency. The inception voltage increases slightly. With the decrease of frequency, the terminal phase in positive and negative cycle are shifted to the earlier position. The average and maximum magnitude of discharge and repetition rate decrease. The phase-resolved partial discharge pattern (PRPD), discharge pattern (qmean-φ, qmax-φ, n-φ and n-q) keep similar but have different range. Some characteristic parameters vary obviously. The results can be the reference for the recognition of PD mode under low frequency voltage. The trend of the measured parameters with the variation of frequency provides more information about the insulation defect than traditional measurements under a single frequency (usually 50 Hz).
Zhou Yuanxiang,Zhou Zhongliu,Guo Shaowei等. Comparison of the Characteristics of Corona Discharge in the Oil under Low and Power Frequency Voltage by Impulse-Current Method[J]. Transactions of China Electrotechnical Society, 2019, 34(1): 160-169.
[1] 邱昌容, 王乃庆. 电工设备局部放电及其测试技术[M]. 北京: 机械工业出版社, 1994. [2] 柳淑艳, 杨帆. 0.1 Hz超低频正弦波耐压试验技术及应用[J]. 高电压技术, 2004, 30(增刊): 79-80.Liu Shuyan, Yang Fan. Application of VLF (0.1Hz) sine-wave voltage withstand technique[J]. High Voltage Engineering, 2004, 30(S): 79-80. [3] 罗俊华,付丽玮,陶士利,等. 0.1Hz和50Hz电压下XLPE电缆局部放电比对试验[J]. 高电压技术,2010, 36(8): 2000-2004.Luo Junhua, Fu Liwei, Tao Shili, et al. Comparing tests of partial discharge on XLPE power cable at 0.1Hz voltage and 50Hz voltage[J]. High Voltage Engineeing, 2010, 36(8): 2000-2004. [4] Bhimani B V.Very-low-frequency high-potential testing[J]. IEEE Transactions on Power Apparatus and Systems, 1961, 80(3): 148-155. [5] 应少鹏, 葛景滂. 0.1 Hz下局部放电的检测[J]. 电工技术学报, 1986, 1(3): 37-41.Ying Shaopeng, Ge Jingpang. The measurement of partial discharge at 0.1 Hz[J]. Transactions of China Electrotechnical Society, 1986, 1(3): 37-41. [6] Miller R, Black I A.Partial discharge measurements over the frequency range 0.1 Hz to 50 Hz[J]. IEEE Transactions on Electrical Insulation, 1977, 12(3): 224-233. [7] Miller R, Black I A.Partial discharge energy measurements on electrical machine insulation when energized at frequencies between 0.1 Hz and power frequency[J]. IEEE Transactions on Electrical Insulation, 1979, 14(3): 127-135. [8] Illias H, Chen G, Lewin P L.Partial discharge behavior within a spherical cavity in a solid dielectric material as a function of frequency and amplitude of the applied voltage[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2011, 18(2): 432-443. [9] Bodega R, Morshuis P H F, Lazzaroni M, et al. PD recurrence in cavities at different energizing methods[J]. IEEE Transactions on Instrumentation and Measurement, 2004, 53(2): 251-258. [10] Fynes-Clinton D, Nyamupangedengu C.Partial discharge characterization of cross-linked polyethylene medium voltage power cable termination defects at very low frequency (0.1 Hz) and power frequency test voltages[J]. IEEE Electrical Insulation Magazine, 2016, 32(4): 15-23. [11] 齐波, 魏振, 李成榕, 等. 交直流复合电场中油纸绝缘沿面放电现象及特征[J]. 电工技术学报, 2016, 31(10): 59-67. Qi Bo, Wei Zhen, Li Chengrong, et al. The phenomena and characteristics of oil-paper insulation surface discharge under AC and DC voltage[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 59-67. [12] 周凯, 吴广宁, 高波, 等. 空间电荷对脉冲电压下局部放电影响研究[J]. 电工技术学报, 2008, 23(10): 11-17.Zhou Kai, Wu Guangning, Gao Bo, et al. Space charge effects on partial discharge activities under pulse voltage[J]. Transactions of China Electrotechnical Society, 2008, 23(10): 11-17. [13] 韩帅, 李庆民, 刘伟杰, 等. 温-频耦合效应对高频固态变压器绝缘局部放电特性的影响[J]. 电工技术学报, 2015, 30(2) : 204-210.Han Shuai, Li Qingmin, Liu Weijie, et al. Impacts of coupled temperature-frequency effects on partial discharge characteristics of high frequency solid state transformer insulation[J]. Transactions of China Electrotechnical Society, 2015, 30(2): 204-210. [14] 刘涛, 韩帅, 李庆民, 等. 频变电应力下高频电力变压器绝缘沿面放电形态及发展过程[J]. 电工技术学报, 2016, 31(19): 199-207.Liu Tao, Han Shuai, Li Qingmin, et al. Patterns and development of the surface discharge of high frequency power transformer insulation under frequency-dependent electric stress[J]. Transactions of China Electrotechnical Society, 2016, 31(19): 199-207. [15] 廖瑞金, 段炼, 汪可, 等. 交流电压下油纸绝缘针板放电特性[J]. 高电压技术, 2014, 40(3): 648-654.Liao Ruijin, Duan Lian, Wang Ke, et al. Partial discharge characteristics of point-plane model in oil-paper insulation under AC voltage[J]. High Voltage Engineering, 2014, 40(3): 648-654. [16] 司文荣, 李军浩, 袁鹏, 等. 直流下油中局部放电脉冲波形测量与特性分析[J]. 西安交通大学学报, 2008, 42(4): 481-486.Si Wenrong, Li Junhao, Yuan Peng, et al. Measurement and analysis for pulse current shapes of partial discharge in oil under DC voltage[J]. Journal of Xi’an Jiaotong University, 2008, 42(4): 481-486. [17] 唐炬, 王静, 李剑, 等. 统计参数用于局部放电模式识别的研究[J]. 高电压技术, 2002, 28(8): 4-6.Tang Ju, Wang Jing, Li Jian, et al. Statistical parameter method for PD pattern recognition[J]. High Voltage Engineering, 2002, 28(8): 4-6. [18] 周凯, 吴广宁, 吴建东, 等. 基于局部放电统计参量的脉冲电压下绝缘老化分析[J]. 电工技术学报, 2008, 23(4): 6-12.Zhou Kai, Wu Guangning, Wu Jiandong, et al. Analysis of aging properties for insulation based on statistical parameters of partial discharge under pulse voltage[J]. Transactions of China Electrotechnical Society, 2008, 23(4): 6-12. [19] 陈伟根, 龙震泽, 谢波, 等. 不同气隙尺寸的油纸绝缘气隙放电特征及发展阶段识别[J]. 电工技术学报, 2016, 31(10): 49-58.Chen Weigen, Long Zhenze, Xie Bo, et al. Characteristics and development stage recognition of air gap discharge within oil-paper insulation considering effect of cavity size[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 49-58. [20] 冯慈璋, 马西奎. 工程电磁场导论[M]. 北京: 高等教育出版社, 2000. [21] Borsi H, Gockenbach E, Schröder U, et al.Contribution to the clarification of partial discharge behaviour in insulating liquids using the schlieren technique[J]. International Transactions on Electrical Energy Systems, 1991, 1(5): 271-279. [22] 张强, 李成榕. X射线激励下局部放电的研究进展[J]. 电工技术学报, 2017, 32(8): 22-32. Zhang Qiang, Li Chengrong. Review on X-ray induced partial discharge[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 22-32.
2019, Vol. 34 
