Research on 3D Numerical Simulation of Temperature and Humidity Distribution inside High Voltage Switchgear
Li Yuan1, Xue Jianyi1, Ren Shuangzan2, Liu Jing2, Zhang Guanjun1
1. State Key Laboratory of Electrical Inulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049 China; 2. State Grid Shaanxi Electric Power Research Institute Xi’an 710100 China;
Abstract：Temperature and humidity changes inside the switchgear will bring about the occurrence of condensation, threatening the safe and reliable operation of power apparatus. A 3-D simplified finite element calculation model for the 40.5kV sheathed indoor AC metal-enclosed switchgear was established, including bus, bushing, circuit breaker, contactor box, cables and other components. The temperature distribution inside the switchgear was calculated under the condition that large current flowed on the surface of conductor bus. Furthermore, the humidity diffusion process was also calculated when the relative humidity of external environment was 0.8, and the relative humidity inside the switchgear was obtained. The simulation results show that condensation is easy to occur on contact box when the surface temperature of the breaker contact box is low and the humidity distribution is high. In addition, it is found that the application of heating and ventilation devices can effectively reduce the humidity and increase the temperature of contact box surface, which is an effective method for reducing the condensation inside the switchgear. The optimum arrangement of heating and ventilating devices is installed on the wall of switchgear cabinet near the contact box and bushing at the same time. The effect of this installation method on reducing the surface condensation of contact box is better than that of setting a single heating or ventilating device.
李元, 薛建议, 任双赞, 刘晶, 张冠军. 高压开关柜温湿度分布的三维数值模拟研究[J]. 电工技术学报, 2019, 34(24): 5095-5103.
Li Yuan, Xue Jianyi, Ren Shuangzan, Liu Jing, Zhang Guanjun. Research on 3D Numerical Simulation of Temperature and Humidity Distribution inside High Voltage Switchgear. Transactions of China Electrotechnical Society, 2019, 34(24): 5095-5103.
[1] Toyoda E, Matsumoto M, Handa T, et al.Insulation failure in telecommunication cables resulting from water condensation in aerial terminal closures and its prevention using a humidity-controlling polymer[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2005, 12(1): 175-182. [2] 岳新峰. 12kV中置柜加热除湿方式探讨[J]. 高压电器, 2002, 38(3): 57-58. Yue Xinfeng.Discussion about the heating and dehumidification style in 12kV substation[J]. High voltage apparatus, 2002, 38(3): 57-58. [3] 周显达. 大气参数对电气设备外绝缘影响的研究[D]. 广州: 华南理工大学, 2012. [4] 胡琴, 何高辉, 彭华东, 等. 高湿条件下基于凝露分布模型的导线电晕起始电压预测[J]. 电工技术学报, 2018, 33(7): 1634-1640. Hu Qin, He Gaohui, Peng Huadong, et al.Prediction of conductor corona onset voltage based on condensation-distribution model under high humidity conditions[J]. Transactions of China Electrotechnical Society, 2018, 33(7): 1634-1640. [5] 李成, 李俊明, 王补宣. 湿空气掠过竖直壁面的凝结换热研究[J]. 哈尔滨工程大学学报, 2011, 32(5): 595-600. Li Cheng, Li Junming, Wang Buxuan.Research of humid are condensation heat transfer across the vertical wall[J]. Journal of Harbin Engineering University, 2011, 32(5): 595-600. [6] 聂一雄, 徐卫东, 周文文, 等. 12kV固体绝缘开关柜中绝缘气隙缺陷的放电特征[J]. 电工技术学报, 2018, 33(12): 2894-2902. Nie Yixiong, Xu Weidong, Zhou Wenwen, et al.Discharge characteristics of sir-gap defects in insu- lating material of 12kV solid insulated switchgear[J]. Transactions of China Electrotechnical Society, 2018, 33(12): 2894-2902. [7] 杨翠茹, 杨帅, 唐铭骏, 等. 较低湿度下含糖污秽绝缘子放电特性[J]. 电工技术学报, 2015, 30(10): 346-353. Yang Cuiru, Yang Shuai, Tang Mingjun, et al.Discharge mechanism of polluted insulator with glucose under low humidity[J]. Transactions of China Electrotechnical Society, 2015, 30(10): 346-353. [8] Lopes I J S, Jayaram S H, Cherney E A. A study of partial discharges from water droplets on a silicone rubber insulating surface[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2001, 8(2): 262-268. [9] Boggs S A and Stone G C. Fundamental limitations in measurement of corona and partial discharge[J]. IEEE Transactions on Electrical Insulation, 1982, 17(2): 143-150. [10] 刘阳, 崔翔, 卢铁兵, 等. 湿度对绞线正极性电晕电流脉冲及其无线电干扰影响的实验[J]. 电工技术学报, 2015, 30(3): 79-89. Liu Yang, Cui Xiang, Lu Tiebing, et al.Experimental investigation of humidity impact on positive corona current pulse and its radio interference of stranded conductors[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 79-89. [11] 丁健. 金属封闭高压开关柜触头发热机理分析及预防过热故障措施探讨[J]. 高压电器, 2012, 48(8): 114-117. Ding Jian.Heating mechanism analysis on metal- enclosed high voltage switchgear contact with measures to prevent overheating[J]. High Voltage Apparatus, 2012, 48(8): 114-117. [12] 巩宪锋, 衣红钢, 王长松, 等. 高压开关柜隔离触头温度监测研究[J]. 中国电机工程学报, 2006, 26(1): 155-158. Gong Xianfeng, Yi Honggang, Wang Changsong, et al.Research on temperature monitoring of isolators in HV switchgear[J]. Proceedings of the CSEE, 2006, 26(1): 155-158. [13] 刘有为, 郑健超. 湿度对绝缘表面工频闪络电压的影响[J]. 中国电机工程学报, 1999, 19(5): 53-58. Liu Youwei, Zheng Jianchao.Influence of humidity on power flashover voltage along insulating sur- faces[J]. Proceedings of the CSEE, 1999, 19(5): 53-58. [14] 李英奇, 王战红, 梅超美, 等. 一起开关柜凝露闪络事故分析及预防措施[J]. 陕西电力, 2009, 37(4): 51-53. Li Yingqi, Wang Zhanhong, Mei Chaomei, et al.Reason analysis of one dewing flashover accident in switchgear and its preventive measure[J]. Shaanxi Power, 2009, 37(4): 51-53. [15] 罗军, 皮志勇, 罗皓文, 等. 高压开关柜防凝露系统的组成与实践[J]. 现代工业经济和信息化, 2015, 21: 21-22. Luo Jun, Pi Zhiyong, Luo Haowen, et al.The composition of high voltage switchgear prevent condensation system and practices[J]. Modern Industrial Economy and Informationization, 2015, 21: 21-22. [16] 张俊民, 侯振华, 张春朋, 等. 27.5kV GIS母线室三维温度场的数值计算[J]. 电工技术学报, 2011, 26(12): 62-67. Zhang Junmin, Hou Zhenhua, Zhang Chunpeng, et al.Three dimensional thermal field numerical calcu- lation of 27.5kV gas-insulated switchgear bus bar's cabinet[J]. Transactions of China Electrotechnical Society, 2011, 26(12): 62-67. [17] 陈强, 李庆民, 丛浩熹, 等. 引入多重边界条件的GIS母线温度分布多场耦合计算及影响因素分析[J]. 电工技术学报, 2016, 31(17): 187-195. Chen Qiang, Li Qingmin, Cong Haoxi, et al.Numerical calculation and correlative factors analysis on temperature distribution of GIS bus bar on coupled multi-physics methodology combined with multiple boundary conditions[J]. Transactions of China Electrotechnical Society, 2016, 31(17): 187-195. [18] 张俊民, 高荟凯, 冯昊. 三种绝缘气体下开关设备的温度场及流场对比与分析[J]. 电工技术学报, 2015, 30(6): 155-161. Zhang Junmin, Gao Huigai, Feng Hao.Analysis of thermal and fluid field of switchgear in three insulating gases[J]. Transactions of China Electro- technical Society, 2015, 30(6): 155-161. [19] 钱勇. 一起客户变电所事故启发对开关柜防凝露装置分析[J]. 电工技术, 2016(4): 106-108. Qian Yong.The analysis of condensation protection device for switchgear inspired by a customer substation accident[J]. Electric Engineering, 2016(4): 106-108.
2019, Vol. 34 
