智能电阻的应用研究
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摘要
通过深度分析中性点经小电阻接地方式所存在的问题,提出了一种配电网中性点经智能电阻接地方式。与小电阻接地方式相比,智能电阻采用分区法,根据中性点电压大小将故障类型分为高阻、中阻以及低阻3个区域。在低阻故障时,能够快速选线跳闸;在中阻故障时,经过延时判断,避免对瞬时性故障的误判;在高阻故障时,启动中、低电阻动态切换,进行准确选线。综合理论分析和仿真计算可得:智能电阻接地方式不仅拥有小电阻接地方式的优点,还能够解决小电阻接地方式中部分供电可靠性低、单相低阻接地时故障点电流过大及单相断线(高阻)接地时零序保护"失灵"等死区问题。该方式对保障电力系统正常运行和人身安全等具有重要意义。
The problem of neutral grounding through small resistance is analyzed deeply,an intelligent resistance grounding mode for distribution network neutral point is put forward. Compared with the small resistance grounding method,the smart resistor adopts the subarea method. According to the neutral point voltage,the fault types can be divided into three zones: high impedance,medium resistance and low resistance. Fast line selection tripping in low resistance fault; in resistance fault,after the delay of transient fault judgment,to avoid miscarriage of justice; in the high resistance fault,starting,low resistance dynamic switching,accurate line selection. Through theoretical analysis and simulation calculation can be obtained: intelligent resistance grounding mode not only has the advantages of small resistance grounding mode,also can solve the small resistance grounding mode in low power supply reliability and low phase grounding fault current is too large and single-phase disconnection(high resistance) ground zero sequence protection " failure" the dead time problem. This method has important significance in ensuring the normal operation of power system and personal safety.
The problem of neutral grounding through small resistance is analyzed deeply,an intelligent resistance grounding mode for distribution network neutral point is put forward. Compared with the small resistance grounding method,the smart resistor adopts the subarea method. According to the neutral point voltage,the fault types can be divided into three zones: high impedance,medium resistance and low resistance. Fast line selection tripping in low resistance fault; in resistance fault,after the delay of transient fault judgment,to avoid miscarriage of justice; in the high resistance fault,starting,low resistance dynamic switching,accurate line selection. Through theoretical analysis and simulation calculation can be obtained: intelligent resistance grounding mode not only has the advantages of small resistance grounding mode,also can solve the small resistance grounding mode in low power supply reliability and low phase grounding fault current is too large and single-phase disconnection(high resistance) ground zero sequence protection " failure" the dead time problem. This method has important significance in ensuring the normal operation of power system and personal safety.
引文
[1]李景禄.现代防雷技术[M].北京:中国水利水电出版社,2009.
[2]李景禄,实用配电网技术.[M]北京,中国水利电力出版社,2006
[3]雷绍兰,王官洁,周林.中性点经中电阻接地方式的研究[J].电力系统及其自动化学报,2000(4):28-30.LEIShaolan,WANG Guanjie,ZHOU Lin. Research on neutral point through resistance grounding[J]. Proceedings of the CSU-EPSA,2000(4):28-30.
[4]陈曦,220 k V变电站小电阻接地系统改造方案设计[D].大连:大连理工大学,2015.
[5]付晓奇.城区10 k V配网中性点小电阻接地技术应用研究[D].保定:华北电力大学,2014.
[6]文玉玲,丁碧薇,宋占党,等.配电网中性点最佳接地电阻值选择[J].电气自动化,2014(6):83-85.WENYuling,DING Biwei,SONG Zhandang,et al. Selection of the best grounding resistance value for distribution network neutral[J]. Electrical Automation,2014(6):83-85.
[7]李景禄. ZXC系列配电网单相接地故障智能处理装置开发研制[R]. 2014.
[8]李政洋,李景禄.一种配电网单相过度电阻接地故障的动态处理方法:CN2016032901194810[P]. 2015-07-25.
[9]李运钱.嘉善20 k V配电网中性点智能切换接地方式的应用研究[D].北京:华北电力大学(北京),2016.
[10]雷潇,廖文龙,刘强,等. 10 k V小电阻接地系统的接触电压安全性研究[J].电瓷避雷器,2017(3):77-81.LEI Xiao,LIAOWenlong,LIU Qiang,et al. Study on contact voltage safety of 10 k V small resistance grounding system[J]. Insulators and Surge Arresters,2017(3):77-81.
[11]高亚栋,杜斌,赵峰,等.中性点经小电阻接地配电网中弧光接地过电压的研究[J].高压电器,2004,40(5):345-348.GAOYadong,DU Bin,ZHAO Feng,et al. Study on the arc-grounding overvoltage in the distribution system with neutral point grounded through low-resistance[J]. High Voltage Apparatus,2004,40(5):345-348.
[12]马烨,黄建峰,郭洁,等. 500 k V架空地线不同接地方式下地线感应电量影响因素研究[J].电瓷避雷器,2015(4):137-142.MA Ye,HUANGJianfeng,GUO Jie,et al. Study on influence factors of ground induced electric energy in 500k V ground wire with different grounding modes[J]. Insulators and Surge Arresters,2015(4):137-142.
[13]郝强.小电流接地系统单相接地故障选线装置的研制[D].长沙:湖南大学,2009.
[14]聂宏展,赵福伟,袁桂东,等. 66 k V配电网中性点经电阻接地的研究[J].电网技术,2007(14):74-78.NIEHongzhan,ZHAO Fuwei,YUAN Guidong,et al.Study on neutral grounding resistance of 66 k V distribution network[J]. Power System Technology,2007(14):74-78.
[15]干耀生,唐庆华,方琼,等.城市中压配网中性点小电阻接地方式分析[J].电力系统及其自动化学报,2013,25(3):138-141.GANYaosheng,TANG Qinghua,FANG Qiong,et al. Analysis of low-resistance neutral grounding in urban medium-voltage power grid[J]. Proceedings of the CSUEPSA,2013,25(3):138-141.
[16]唐翔,牟龙华. 3. 3 k V电网变压器中性点经电阻接地方式研究[J].高压电器,2005(6):452-455.TANG Xiang,MOULonghua. Study on grounding mode of neutral point of 3. 3 k V power grid[J]. High Voltage Apparatus,2005(6):452-455.
[2]李景禄,实用配电网技术.[M]北京,中国水利电力出版社,2006
[3]雷绍兰,王官洁,周林.中性点经中电阻接地方式的研究[J].电力系统及其自动化学报,2000(4):28-30.LEIShaolan,WANG Guanjie,ZHOU Lin. Research on neutral point through resistance grounding[J]. Proceedings of the CSU-EPSA,2000(4):28-30.
[4]陈曦,220 k V变电站小电阻接地系统改造方案设计[D].大连:大连理工大学,2015.
[5]付晓奇.城区10 k V配网中性点小电阻接地技术应用研究[D].保定:华北电力大学,2014.
[6]文玉玲,丁碧薇,宋占党,等.配电网中性点最佳接地电阻值选择[J].电气自动化,2014(6):83-85.WENYuling,DING Biwei,SONG Zhandang,et al. Selection of the best grounding resistance value for distribution network neutral[J]. Electrical Automation,2014(6):83-85.
[7]李景禄. ZXC系列配电网单相接地故障智能处理装置开发研制[R]. 2014.
[8]李政洋,李景禄.一种配电网单相过度电阻接地故障的动态处理方法:CN2016032901194810[P]. 2015-07-25.
[9]李运钱.嘉善20 k V配电网中性点智能切换接地方式的应用研究[D].北京:华北电力大学(北京),2016.
[10]雷潇,廖文龙,刘强,等. 10 k V小电阻接地系统的接触电压安全性研究[J].电瓷避雷器,2017(3):77-81.LEI Xiao,LIAOWenlong,LIU Qiang,et al. Study on contact voltage safety of 10 k V small resistance grounding system[J]. Insulators and Surge Arresters,2017(3):77-81.
[11]高亚栋,杜斌,赵峰,等.中性点经小电阻接地配电网中弧光接地过电压的研究[J].高压电器,2004,40(5):345-348.GAOYadong,DU Bin,ZHAO Feng,et al. Study on the arc-grounding overvoltage in the distribution system with neutral point grounded through low-resistance[J]. High Voltage Apparatus,2004,40(5):345-348.
[12]马烨,黄建峰,郭洁,等. 500 k V架空地线不同接地方式下地线感应电量影响因素研究[J].电瓷避雷器,2015(4):137-142.MA Ye,HUANGJianfeng,GUO Jie,et al. Study on influence factors of ground induced electric energy in 500k V ground wire with different grounding modes[J]. Insulators and Surge Arresters,2015(4):137-142.
[13]郝强.小电流接地系统单相接地故障选线装置的研制[D].长沙:湖南大学,2009.
[14]聂宏展,赵福伟,袁桂东,等. 66 k V配电网中性点经电阻接地的研究[J].电网技术,2007(14):74-78.NIEHongzhan,ZHAO Fuwei,YUAN Guidong,et al.Study on neutral grounding resistance of 66 k V distribution network[J]. Power System Technology,2007(14):74-78.
[15]干耀生,唐庆华,方琼,等.城市中压配网中性点小电阻接地方式分析[J].电力系统及其自动化学报,2013,25(3):138-141.GANYaosheng,TANG Qinghua,FANG Qiong,et al. Analysis of low-resistance neutral grounding in urban medium-voltage power grid[J]. Proceedings of the CSUEPSA,2013,25(3):138-141.
[16]唐翔,牟龙华. 3. 3 k V电网变压器中性点经电阻接地方式研究[J].高压电器,2005(6):452-455.TANG Xiang,MOULonghua. Study on grounding mode of neutral point of 3. 3 k V power grid[J]. High Voltage Apparatus,2005(6):452-455.