10 kV配网中性点小电阻接地系统的研究与设计
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摘要
配电网的中性点接地方法是一个多因素的技术问题,一直是国内和国际研究的热点。传统小电阻接地系统在高阻接地或间歇接地故障时接地电流非常小,不满足零序电流保护要求,这种现象长时间会烧毁电阻器。针对这种现象,提出一种新型小电阻接地系统。在分析10 kV配电网中性点小电阻接地技术的结构和特点的基础上,用Matlab对新型小电阻接地系统进行仿真。仿真证明,新型小电阻接地系统比传统的小电阻接地系统更加安全可靠,对我国配电网自动化的发展可以提供参考和借鉴。
The neutral grounding method of distribution network is a multi-factor technical problem, which has been a hot spot of domestic and international research. The grounding current of traditional small resistance grounding system is very small when high resistance grounding or intermittent grounding fault occurs, which can not meet the requirement of zero sequence current protection. This phenomenon will burn resistors for a long time. In view of this phenomenon, a new type of small resistance grounding system is proposed. Based on the analysis of the structure and characteristics of the neutral grounding technology for 10 kV distribution network, a new type of small resistance grounding system is simulated with Matlab. It is proved that the new type of small resistance grounding system is safer and more reliable than the traditional small resistance grounding system, hoping to supply some reference and guidance for the development of distribution network automation in China.
The neutral grounding method of distribution network is a multi-factor technical problem, which has been a hot spot of domestic and international research. The grounding current of traditional small resistance grounding system is very small when high resistance grounding or intermittent grounding fault occurs, which can not meet the requirement of zero sequence current protection. This phenomenon will burn resistors for a long time. In view of this phenomenon, a new type of small resistance grounding system is proposed. Based on the analysis of the structure and characteristics of the neutral grounding technology for 10 kV distribution network, a new type of small resistance grounding system is simulated with Matlab. It is proved that the new type of small resistance grounding system is safer and more reliable than the traditional small resistance grounding system, hoping to supply some reference and guidance for the development of distribution network automation in China.
引文
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[2]韩昆仑,蔡泽祥,贺智,等.高压直流输电线路故障行波传播特性及其对行波保护的影响[J].电力系统保护与控制,2013,41(21):20-25.HAN Kunlun,CAI Zexiang,HE Zhi,et al.Traveling wave propagation characteristics of HVDC transmission line faults and its influence on traveling wave protection[J].Power System Protection and Control,2013,41(21):20-25.
[3]段建东,刘静,陆海龙,等.基于行波瞬时频率的高压直流输电线路故障测距方法[J].中国电机工程学报,2016,36(7):1842-1848.DUAN Jiandong,LIU Jing,LU Hailong,et al.Fault location method for HVDC transmission lines based on traveling wave instantaneous frequency[J].Proceedings of the CSEE,2016,36(7):1842-1848.
[4]宋国兵,李德坤,靳东晖,等.利用行波电压分布特征的柔性直流输电线路单端故障定位[J].电力系统自动化,2013,37(15):83-88.SONG Guobing,LI Dekun,JIN Donghui,et al.Singleterminal fault location of flexible HVDC transmission lines using traveling wave voltage distribution characteristics[J].Automation of Electric Power Systems,2013,37(15):83-88.
[5]刘文军,仇彦军,孙立臣.500 kV输电线路杆塔接地网不同环境下优化降阻方案研究[J].电力系统保护与控制,2018,41(13):88-106.LIU Wenjun,QIU Yanjun,SUN Lichen.500 kVtransmission line tower grounding grid optimal resistance reduction scheme under different environment[J].Power System Protection and Control,2018,41(13):88-106.
[6]侯小虎,封孝松,闫海峰,等.注入式定子接地保护补偿参数测定新方法[J].水电与新能源,2018,42(6):251-253.HOU Xiaohu,FENG Xiaosong,YAN Haifeng,et al.Anew method for determining compensation parameters of injected stator grounding protection[J].Hydropower and New Energy Sources,2018,42(6):251-253.
[7]张乃刚,张加胜,郑长明,等.基于零序电流幅值分布相似性的小电流接地故障定位方法[J].电力系统保护与控制,2018,41(13):120-125.ZHANG Naigang,ZHANG Jiasheng,ZHENG Changming,et al.A method for locating small-current grounding faults based on the similarity of zero-sequence current amplitude distribution[J].Power System Protection and Control,2018,41(13):120-125.
[8]徐玉琴,杨浩,李鹏.不同接地方式电缆型配电网单相接地故障下的可靠性评估[J].电力系统保护与控制,2018,41(13):41-47.XU Yuqin,YANG Hao,LI Peng.Reliability evaluation under single-phase-to-ground fault of cable distribution network with different grounding modes[J].Power System Protection and Control,2018,41(13):41-47.
[9]宋国兵,高淑萍,蔡新雷,等.高压直流输电线路继电保护技术综述[J].电力系统自动化,2012,36(22):123-129.SONG Guobing,GAO Shuping,CAI Xinlei,et al.Summary of HVDC line relay protection technology[J].Automation of Electric Power Systems,2012,36(22):123-129.
[10]杨建,唐忠.高压电缆在线行波故障测距算法的设计[J].电力系统保护与控制,2016,44(14):48-54.YANG Jian,TANG Zhong.Design of on line traveling wave fault location algorithm for high voltage cables[J].Power System Protection and Control,2016,44(14):48-54.
[11]NAHMAN J,SALAMON D.Mutual interference of neighboring grounding systems and approximate formulation[J].Electric Power Systems Research,2017,41(12):151-156.
[12]黄建业,陈敏维,张功林,等.基于突变逻辑阵的配网小电流接地故障判定方法[J].智慧电力,2017,45(8):45-50.HUANG Jianye,CHEN Minwei,ZHANG Gonglin,et al.A method for determining small current grounding fault in distribution network based on catastrophic logic array[J].Smart Power,2017,45(8):45-50.
[13]ABAEI M M,ARZAGHI E,ABBASSI R,et al.Dynamic reliability assessment of ship grounding using Bayesian Inference[J].Ocean Engineering,2018,28(6):159-161.
[14]CAETANO C E F,LIMA A B,PAULINO J O S,et al.Aconductor arrangement that overcomes the effective length issue in transmission line grounding[J].Electric Power Systems Research,2018,46(5):159-162.
[15]秦如意,刘宗良,陈洲,等.某地区配电线路防雷现状分析及防雷装置研究[J].中国电力,2018,51(4):39-44.QIN Ruyi,LIU Zongliang,CHEN Zhou,et al.Analysis of lightning protection status of distribution lines in a certain area and study of lightning protection devices[J].Electric Power,2018,51(4):39-44.
[16]LIU B,PEDERSEN P T,ZHU L,et al.Review of experiments and calculation procedures for ship collision and grounding damage[J].Marine Structures,2018,46(3):59-66.
[17]YOUSSEF S A M,PAIK J K.Hazard identification and scenario selection of ship grounding accidents[J].Ocean Engineering,2018,46(4):153-159.
[18]DATSIOS Z G,MIKROPOULOS P N.Safety performance evaluation of typical grounding configurations of MV/LVdistribution substations[J].Electric Power Systems Research,2017,26(15):150-156.
[19]孙昕.中国电力建设技术进展及发展趋势-(上)电网部分[J].中国电力,2017,50(3):1-8.SUN Xin.Technological progress and development trend of China's electric power construction-(1)power grid part[J].Electric Power,2017,50(3):1-8.
[20]刘专,郭泉辉,刘娟,等.基于统计数据的配网故障修复时长分析[J].中国电力,2017,50(5):84-87.LIU Zhuan,GUO Quanhui,LIU Juan,et al.Distribution network fault repair time analysis based on statistical data[J].Electric Power,2017,50(5):84-87.