滞留电荷对智能配电设备一二次融合的影响与对策
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摘要
断路器在电压非零点时分闸,带来了滞留电荷。在中性点直接接地或经消弧线圈接地系统中,合闸时,滞留电荷泄放的直流电压叠加在正弦信号上,易造成一二次不融合。在中性点不接地系统中,合闸时,若系统对地绝缘电阻较大,则影响较小;若系统对地绝缘电阻较小,则影响较大。针对电源TV的不同接线方式,部分采用阻容分压型电压传感器,是解决暂态滞留电荷影响的一种途径;但其设计应符合对地绝缘电阻、时间常数、测量精度等综合要求。
The detention charge will be caused due to opening of circuit breaker at non-zero point voltage.In the neutral point direct earthing system or the system through arc suppression coil,the DC voltage released by the detention charge is superimposed on the sinusoidal signal in closing operation,which is likely to cause primary&secondary non-fusion.While,in the unearthed neutral point system in closing operation,the influence is less if the insulation resistance to earth is higher and vice versa.As for the different wiring modes of power TV,partial adoption of RC dividing voltage sensor is a kind of way to solve the influence of transient detention charge,but its design shall comply with such comprehensive requirements as insulation to earth,time constant and measurement accuracy etc.
The detention charge will be caused due to opening of circuit breaker at non-zero point voltage.In the neutral point direct earthing system or the system through arc suppression coil,the DC voltage released by the detention charge is superimposed on the sinusoidal signal in closing operation,which is likely to cause primary&secondary non-fusion.While,in the unearthed neutral point system in closing operation,the influence is less if the insulation resistance to earth is higher and vice versa.As for the different wiring modes of power TV,partial adoption of RC dividing voltage sensor is a kind of way to solve the influence of transient detention charge,but its design shall comply with such comprehensive requirements as insulation to earth,time constant and measurement accuracy etc.
引文
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[2]吴骏.智能配电网电能质量问题简析[J].电力电容器与无功补偿,2016,37(6):35-39.WU Jun. Analysis on power quality of smart distribution grid[J]. Power Capacitor&Reactive Power Compensation,2016,37(6):35-39.
[3]刘东,沈兵兵,赵江河,等.智能配电领域2013年度关键技术进展[J].华东电力,2014,42(1):1-5.LIU Dong,SHEN Bingbing,ZHAO Jianghe,et al. Review of 2013 key technology progress in smart power distribution area[J]. East China Electric Power,2014,42(1):1-5.
[4]黄伟军,钱远驰,吕志来.闭环运行方式城市配电网接线模式的研究[J].电力系统保护与控制,2013,41(24):123-127.HUANG Weijun,QIAN Yuanchi,LYU Zhilai. Research of city distribution network layouts for closed-loop system[J].Power System Protection and Control,2013,41(24):123-127.
[5]赵丽莉,李雪明,倪明等.继电保护与安全稳定性控制系统隐性故障研究综述及展望[J].电力系统自动化,2014,38(22):128-132.ZHAO Lili,LI Xueming,NI Ming,et al. Review and prospect of recessive faults in relay protection and safety and stability control system[J]. Automation of Electric Power Systems,2014,38(22):128-132.
[6]王佳颖,郭志忠,张国庆,等.电子式电压互感器暂态特性仿真与研究[J].电力自动化设备. 2012,32(3):62-69.WANG Jiaying,GUO Zhizhong,ZHANG Guoqing,et al.Simulation and study of transient characteristics of electronic voltage transformer[J]. Electric Power Automation Equipment,2012,32(3):62-69.
[7]孙建东,蔡月明,岳仁超.关于换相开关切换过程中的突变量分析[J].自动化与仪器仪表,2015,9(9):220-222.SUN Jiandong,CAI Yueming,YUE Renchao. Analysis of sudden change in the switching process of the switch[J].Automation&Instrumentation,2015,9(9):220-222.
[8]房金兰.关于电容式电压互感器技术发展的探讨[J].电力电容器与无功补偿,2013,34(1):1-6.FANG Jinlan. Discussion on technical development of capacitor voltage transformers[J]. Power Capacitor&Reactive Power Compensation,2013,34(1):1-6.
[9]互感器第8部分:电子式电流互感器:GB/T 20840.8—2007[S]. 2007.Instrument transformers—Part 8:Electronic current transformers:GB/T 20840.8—2007[S]. 2007.
[10]黎鹏,黄道春,阮江军,等.柱上开关开断时对智能二次设备的电磁干扰研究[J].电工技术学报,2015,30(8):27-37.LI Peng,HUANG Daochun,RUAN Jiangjun,et al. The EMI study of pole-mounted switch’s breaking on its secondary smart devices[J]. Transactions of China Electrotechnical Society,2015,30(8):27-37.
[11]金琪,李烽,顾临峰,等.新型智能化环网柜的设计及实现[J].华东电力,2014,42(7):1373-1376.JIN Qi,LI Feng,GU Linfeng,et al. Design and realization of new intelligent switchgear[J]. East China Electric Power,2014,42(7):1373-1376.
[12]刘翊平.配网故障处理智能化装置探讨[J].电力系统保护与控制,2017,45(18):163-169.LIU Yiping. Discussion on intelligent device of power distribution network fault processing[J]. Power System Protection and Control,2017,45(18):163-169.
[13]杨桂平,郭毅.阻容分压型电子式电压互感器研究与设计[J].电力电容器与无功补偿,2018,39(3):96-101.YANG Guiping,GUO Yi. Study and design on electronic voltage transformer based on resistance-capacitance divider[J]. Power Capacitor&Reactive Power Compensation,2018,39(3):96-101.
[14]兰剑,王承玉,李庆余.中国配电开关应关注发展的热点[J].高压电器,2015,51(10):217-220.LAN Jian,WANG Chengyu,LI Qingyu. Development focuses of distribution switchgears in China[J]. High Voltage Apparatus,2015,51(10):217-220.
[15]游一民,欧阳振国,马平,等.影响真空断路器关合时触头熔焊的另一重要因素[J].高压电器,2014,50(8):53-56.YOU Yimin,OUYANG Zhenguo,MA Ping,et al. Another important factor affecting vacuum circuit breaker closed contact welding[J]. High Voltage Apparatus,2014,50(8):53-56.
[16]刘宝稳,王崇林,李晓波.不对称电网不完全接地故障零序电压轨迹及应用[J].中国电机工程学报,2014,34(28):4959-4567.LIU Baowen,WANG Chonglin,LI Xiaobo. Analysis and application of zero-sequence voltage of single-phase ground fault asymmetrical system[J]. Proceedings of the CESS,2014,50(8):53-56.