Abstract：In accordance with the deficiency of common insulation supervising methods for DC system, the paper advances a novel method for on-line insulation supervising - dynamic defference value method. Meanwhile, the method detects branch grounding fault by the ratio of the voltage variation and leakage current variation after switching resistor twice. This method not only overcomes the detecting dead zone of insulation monitoring devices, but also eliminates the misstatement or omission result from zero-drift in sensors. It improves the sensitivity and accuracy of the measurement. It shows that this method is accurate and reliable in practial application.
周军, 朱博楠, 杨圣强, 王鹏. 基于动态差值法的直流系统绝缘监测技术[J]. 电工技术学报, 2015, 30(1): 235-241.
Zhou Jun, Zhu Bonan, Yang Shengqiang, Wang Peng. Dynamic Difference Value Method for Insulation Monitoring in DC System. Transactions of China Electrotechnical Society, 2015, 30(1): 235-241.
[1] 鲍谚, 姜久春, 张维戈. 新型直流系统绝缘在线监测方法[J]. 高电压技术, 2011, 37(2): 333-337. Bao Yan, Jiang Jiuchun, Zhang Weige. Novel on-line insulation supervising method for DC system[J]. High Voltage Engineering, 2011, 37(2): 333-337. [2] 宋人杰, 王晓东, 苏畅. 直流接地故障监测装置的设计[J]. 高电压技术, 2010, 36(4): 975-979. Song Renjie, Wang Xiaodong, Su Chang. Design of apparatus for monitoring DC system ground faults[J]. High Voltage Engineering, 2010, 36(4): 975-979. [3] 赵梦欣, 陈国峰, 余伟成. 直流系统绝缘监测的直流漏电流法改进方案[J]. 电力系统自动化, 2009, 33(14): 83-88. Zhao mengxin, Chen Guofeng, Yu Weicheng. Modifica- tion of the leakage method for DC system insulation monitoring[J]. Automation of Electric Power Systems, 2009, 33(14): 83-88. [4] 李立伟, 刘险峰, 刘斌. 基于现场总线的分布式直流系统接地在线监测装置设计[J]. 电力自动化设备, 2006, 26(12): 55-58. Li Liwei, Liu Xianfeng, Liu Bin. Distributed on-line grounding monitoring system for DC system based on field bus[J]. Electric Power Automation Equipment, 2006, 26(12): 55-58. [5] 陈安伟, 乐全明, 于文斌, 等. 直流系统环路供电方式及环路接地问题研究[J]. 电力系统保护与控制, 2010, 38(11): 133-136. Chen Anwei, Yue Quanming, Yu Wenbin, et al. Research on DC loop power supply mode and the loop grounding[J]. Power System Protection and Control, 2010, 38(11): 133-136. [6] 王尧, 李奎, 郭志涛, 等. 磁调制式直流漏电流互感器[J]. 电工电能新技术, 2012, 31(2): 69-73. Wang Yao, Li Kui, Guo Zhitao, et al. Magnetic modulation-based DC leakage current transformer[J]. Advanced Technology of Electrical Engineering and Enegy, 2012, 31(2): 69-73. [7] 张刚, 杜深慧, 王美华, 等. 基于M/T法直流母线绝缘检测系统的研究[J]. 电测与仪表, 2006, 43(8): 10-13. Zhang Gang, Du Shenhui, Wang Meihua, et al. Study on online insulation detection for DC system based on M/T technology[J]. Electrical Measurement & Instru- mentation, 2006, 43(8): 10-13. [8] 陈元平, 李树君, 张玉奎. 绝缘监测装置在直流系统中的应用[J]. 电力系统保护与控制, 2008, 36(15): 91-93. Chen Yuanping, Li Shujun, Zhang Yukui. Application of insulated monitoring device in DC system[J]. Power System Protection and Control, 2008, 36(15): 91-93. [9] 黄海宏, 全成, 黄锦. 基于差流检测法的分布式直流接地巡检系统[J]. 电子测量与仪器学报, 2009, 23(11): 36-41. Huang Haihong, Quan Cheng, Huang Jin. Development of distributed DC grounding detecting system based on differential current detecting method[J]. Journal of Electronic Measurement and Instrument, 2009, 23(11): 36-41. [10] 魏伟明, 魏秉国. 直流系统负极一点接地致开关跳闸原因分析[J]. 继电器, 2008, 36(9): 76-79. Wei Weiming, Wei Bingguo. Causes Analysis about one point earthing leading to breaker tripping in DC system[J]. Relay, 2008, 36(9): 76-79. [11] 尹星光, 何铭宁, 徐玉凤, 等. 直流接地巡检装置误、漏选线问题分析[J]. 继电器, 2008, 36(10): 83-85. Yin Xingguang, He Mingning, Xu Yufeng, et al. Analysis on the wrongly or missed line selection with DC ground fault patrol device[J]. Relay, 2008, 36(10): 83-85. [12] 王友仁, 崔江, 刘新峰. 直流系统在线绝缘检测技术研究[J]. 仪器仪表学报, 2005, 26(8): 849-852. Wang Youren, Cui Jiang, Liu Xinfeng. DC system insulation automatic monitoring instrument[J]. Chinese Journal of Scientific instrument, 2005, 26(8): 849-852. [13] 王瑞祥, 刘峰, 熊小伏, 等. 变电站直流电源绝缘在线监测新方法[J]. 电力自动化设备, 2009, 29(12): 65-67. Wang Ruixiang, Liu Feng, Xiong Xiaofu, et al. On-line insulation monitoring of substation DC power supply[J]. Electric Power Automation Equipment, 2009, 29(12): 65-67. [14] Cavallini A, Conti M, Montanari G C, et al. PD inference for the early detection of electrical treeing in insulation systems[J]. IEEE Transactions on Dielec- trics and Electrical Insulation, 2004, 11(4): 724-735. [15] James Lenz, Alan S Edelstein. Magnetic sensors and their applications[J]. IEEE Sensors Journal, 2006, 6(3): 631-649. [16] Jose M. Understand ground fault detection & isolation in DC system[C]. IEEE Power Engineering Society Summer Meeting, Seattle, USA, 2000: 1707-1711. [17] 胡君, 尹华杰. 基于数字滤波器的直流系统接地故障检测法[J]. 继电器, 2006, 34(17): 13-17. Hu Jun, Yin Huajie. Fault grounding detecting of DC system based on digital filter[J]. Relay, 2006, 34(17): 13-17. [18] Jishun J, Hua J. Study of insulation monitoring device for DC system based on multi-switch combination[C]. Second International Symposium on Computational Intelligence and Design(ISCID), Changsha, 2009: 429-433. [19] 李志强, 钱进. 分布式绝缘监测系统同步测量方案[J]. 高电压技术, 2007, 33(5): 196-198. Li Zhiqiang, Qian Jin. Novel synchronous measurement for distributed insulation supervising system[J]. High Voltage Engineering, 2007, 33(5): 196-198. [20] 张毅, 张泉, 李永丽. 直流系统接地检测[J]. 电力系统及其自动化学报, 2005, 2(1): 27-30. Zhang Yi, Zhang Quan, Li Yongli. Ground fault detection[J]. Proceedings of the CSU-EPSA, 2005, 2(1): 27-30. [21] 苏义鑫, 刘林伟. 平衡电阻法监测直流系统绝缘[J]. 电力系统自动化, 2003, 27(14): 65-68. Su Yixin, Liu Linwei. Monitoring and detecting of DC system insulation by balance resistance method[J]. Automation of Electric Power Systems, 2003, 27(14): 65-68. [22] 孙鸣, 马娟. 直流系统微机型绝缘监测装置电阻选择[J]. 电力系统保护与控制, 2011, 39(4): 128-131. Sun Ming, Ma Juan. The resistor selection of micro- computer-based insulation monitor for DC system[J]. Power System Protection and Control, 2011, 39(4): 128-131. [23] DL/ T5044—2004 电力工程直流系统设计技术规程[S]. 北京: 中国电力出版社, 2007.
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