Electrical and thermal aging analysis of all-film pulsed capacitor
-
摘要: 全膜脉冲电容器是脉冲功率系统的重要储能单元，其寿命影响着整个系统的可靠性。在脉冲工况下，全膜脉冲电容器的失效多为突发失效，且寿命的分散性较大。为探究全膜脉冲电容器老化失效机理，开展了其寿命试验及电场与温度场的仿真。利用LTD基本放电单元（Brick）实验腔体对电容器进行寿命测试并获得失效电容器，分析了失效电容在不同故障形式下的失效原因，并利用有限元分析软件对电容器局部“电场易畸变”区域进行了电场仿真，说明上述区域存在的畸变电场是发生绝缘介质击穿的主要原因；对电容器进行温度场分析，发现电容器温度与充放电频率成正相关，温度最高点位于电容器几何中心处附近，在充放电频率较低时，电容器温升不明显，说明在较低充放电频率下，电容器绝缘介质老化以电老化为主，而非热老化。Abstract: The all-film pulsed capacitor is an important energy storage unit of the pulsed power system, and its lifetime affects the reliability of the whole system. Under the pulse condition, the failure of the all-film pulsed capacitor is mostly a sudden failure, and the life is highly dispersed. To explore the aging and failure mechanism of all-film pulsed capacitors, the life test and the simulation of electric and temperature fields were carried out. The life test of the capacitor was carried out by using the LTD basic discharge unit (brick) experimental chamber to test the life of the capacitor and obtain the failed capacitor, and the failure causes of the failed capacitor under different fault forms were analyzed, and the electric field simulation of the local “electric field distortion” area of the capacitor was carried out by using the finite element analysis software, which showed that the distorted electric field in the above area was the main reason for the breakdown of the insulating medium. The temperature field analysis of the capacitor shows that the temperature of the capacitor is positively correlated with the charge-discharge frequency, and the highest temperature point is located near the geometric center of the capacitor, and the temperature rise of the capacitor is not obvious when the charge-discharge frequency is low, indicating that the aging of the capacitor insulating medium is mainly electrical aging rather than thermal aging at low charge-discharge frequency.
-
Key words:
- all-film pulsed capacitor /
- life test /
- aging /
- electric field distortion /
- failure mechanism
-
图 2 全膜元件圆弧处电场分布
Figure 2. Electric field distribution at circular arc of full film core
图 4 折边与未折边的电极边缘电场分布对比
Figure 4. Comparison of electric field distribution at the edge of the electrode between folded and unfolded edges
图 5 高压侧含有杂质时的畸变电场分布
Figure 5. Distorted electric field distribution with impurities on the high voltage side
图 6 低压侧含有杂质时的畸变电场分布
Figure 6. Distorted electric field distribution with impurities on the low voltage side
图 7 电容器绝缘材料的热老化及烧蚀
Figure 7. Thermal aging and ablation of capacitor insulation material
-
[1] 江伟华. 高重复频率脉冲功率技术及其应用: (5)脉冲叠加的意义[J]. 强激光与粒子束, 2013, 25(8):1877-1882 doi: 10.3788/HPLPB20132508.1877Jiang Weihua. Repetition rate pulsed power technology and its applications: (V) The implication of pulse adding[J]. High Power Laser and Particle Beams, 2013, 25(8): 1877-1882 doi: 10.3788/HPLPB20132508.1877 [2] 陈林, 王勐, 谢卫平, 等. Z箍缩直线变压器驱动源原型模块设计[J]. 强激光与粒子束, 2014, 26:095007 doi: 10.3788/HPLPB20142609.95007Chen Lin, Wang Meng, Xie Weiping, et al. Design of the linear transformer driver stage prototype for Z-pinch driver[J]. High Power Laser and Particle Beams, 2014, 26: 095007 doi: 10.3788/HPLPB20142609.95007 [3] Li Hua, Li Liwei, Wang Wenjuan, et al. Study on the lifetime characteristics of pulsed capacitors based on the theory of space charge[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2016, 23(5): 2526-2533. doi: 10.1109/TDEI.2016.7736809 [4] Li Jingtao, Zhao Zheng, Li Jianhao, et al. Experimental study on the lifetime of the all-film pulse capacitor in LTD systems[C]//2017 1st International Conference on Electrical Materials and Power Equipment (ICEMPE). 2017: 262-265. [5] 张晨萌, 蓝天, 蓝磊, 等. 简化冲击电容器元件圆弧区缺陷场强三维有限元仿真[J]. 武汉大学学报(工学版), 2021, 54(5):421-428Zhang Chenmeng, Lan Tian, Lan Lei, et al. Simplified three-dimensional finite element simulation of defect field intensity in the arc area of surge capacitor element[J]. Engineering Journal of Wuhan University, 2021, 54(5): 421-428 [6] 赵凯林. 电力电容器中油膜绝缘电老化与热老化的介电响应特性研究[D]. 重庆: 重庆大学, 2021Zhao Kailin. The study on dielectric response characteristics of oil-film insulation in power capacitor after electrical and thermal aging[D]. Chongqing: Chongqing University, 2021 [7] Feng Bingyang, Li Yuansheng, He Mengbing. Thermal characteristics of all-film pulsed capacitors in application of repetitive pulse discharge[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2021, 28(4): 1408-1415. doi: 10.1109/TDEI.2021.009567 [8] 国江, 马跃, 朱庆东, 等. 高压全膜电容器内熔丝温度场仿真分析[J]. 电力电容器与无功补偿, 2020, 41(5):74-80Guo Jiang, Ma Yue, Zhu Qingdong, et al. Thermal field simulation analysis of internal fuse in high voltage film capacitors[J]. Power Capacitor & Reactive Power Compensation, 2020, 41(5): 74-80 [9] 王霞, 孙晓彤, 刘全宇, 等. 基于空间电荷效应的绝缘老化寿命模型的研究进展[J]. 高电压技术, 2016, 42(3):861-867Wang Xia, Sun Xiaotong, Liu Quanyu, et al. Research development of aging models of insulation materials based on space charge effect[J]. High Voltage Engineering, 2016, 42(3): 861-867 [10] 李化, 吕霏, 林福昌, 等. 应用于脉冲功率系统的高储能密度电容器[J]. 强激光与粒子束, 2012, 24(3):554-558 doi: 10.3788/HPLPB20122403.0554Li Hua, Lv Fei, Lin Fuchang, et al. High energy storage density capacitors in pulsed power application[J]. High Power Laser and Particle Beams, 2012, 24(3): 554-558 doi: 10.3788/HPLPB20122403.0554 [11] Jiang Jinbo, He Mengbing. Design of low inductance, long life capacitor for linear transformer drivers[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2015, 22(6): 3555-3559. doi: 10.1109/TDEI.2015.004737 [12] Mi Yan, Chen Yong, Liu Canhui, et al. Partial discharge characteristics of biaxially oriented polypropylene film under nanosecond pulse voltage with high rise rate[J]. IEEE Transactions on Plasma Science, 2023, 51(2): 498-506. doi: 10.1109/TPS.2023.3234033 [13] 方田, 李化, 黄想, 等. 工频叠加谐波电压下温度对全膜电容器绝缘介质击穿特性的影响[J]. 高压电器, 2022, 58(9):142-148Fang Tian, Li Hua, Huang Xiang, et al. Influence of temperature on the dielectric breakdown characteristics of foil-film capacitor under AC superimposed harmonic voltage[J]. High Voltage Apparatus, 2022, 58(9): 142-148 [14] 闫澜锋, 刘刚, 刘锦宁. 有限元法分析金属杂质对电力电容器元件内部电场的影响[J]. 高压电器, 2012, 48(8):118-122Yan Lanfeng, Liu Gang, Liu Jinning. Analyzing influences of metal impurities on internal electric field of power capacitors with finite element method[J]. High Voltage Apparatus, 2012, 48(8): 118-122 [15] Li Hua, Li Zhiwei, Xu Zhijian, et al. Electric field and temperature dependence of electrical conductivity in biaxially oriented polypropylene films[J]. IEEE Transactions on Plasma Science, 2014, 42(11): 3585-3591. doi: 10.1109/TPS.2014.2360893 [16] Qin S, Ho J, Rabuffi M, et al. Implications of the anisotropic thermal conductivity of capacitor windings[J]. IEEE Electrical Insulation Magazine, 2011, 27(1): 7-13. doi: 10.1109/MEI.2011.5699442 [17] 徐志坚, 李智威, 李化, 等. 重复频率脉冲电容器寿命测试平台[J]. 强激光与粒子束, 2014, 26:045023 doi: 10.3788/HPLPB20142604.45023Xu Zhijian, Li Zhiwei, Li Hua, et al. Lifetime test platform for repetitive pulse capacitors[J]. High Power Laser and Particle Beams, 2014, 26: 045023 doi: 10.3788/HPLPB20142604.45023 [18] MacDonald J R, Schneider M A, Schalnat M C, et al. Thermal modeling of high temperature power conversion capacitors[C]//2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC). 2012: 256-259. [19] 周晨, 张翔, 刘磊, 等. 换流阀阻尼电容器等效温升试验及寿命评估[J]. 电力工程技术, 2022, 41(5):149-155Zhou Chen, Zhang Xiang, Liu Lei, et al. Equivalent temperature rise test and life evaluation of converter valve damping capacitor[J]. Electric Power Engineering Technology, 2022, 41(5): 149-155 -
下载:
点击查看大图
图(10)
计量
- 文章访问数: 194
- HTML全文浏览量: 74
- PDF下载量: 77
- 被引次数: 0
