数字化变电站小电流接地故障选线方案设计
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摘要
当前我国3~66kV电网广泛采用小电流接地方式,此方式下的单相接地故障一般占总故障的80%以上。多年来研究人员提出了多种选线方法,这些方法的核心是通过研究简化的系统模型寻找故障特征,确定选线判据。目前很多算法和原理已经达到商用,单独的硬件装置或者软件方法都在现场得到广泛应用。但是大多数的选线装置或软件都无法达到完全的正确率;与此同时,某些选线率相对较高的装置造价也相对较高。近几年,在我国电力体制改革推进的基础上,电力网发展迅速,特别是计算机技术和通信网络技术的快速发展,使变电站自动化技术进入了数字化、微机化的新阶段。数字化变电站概念已经炙手可热,数字化变电站的建设也已经被逐步实现。数字化变电站中,一次侧的模拟量、开关量的输入和二次侧控制量的输出都相较传统变电站自动化系统有很大变化,无论是数据传送的媒介、方式还是传输数据的精度,都在本质上有了极大的改进。目前,世界上和国内已经有不少的数字化变电站投入运行。新型的保护、测控装置和部分自动装置也已经进入实际应用阶段。在数字化变电站快速发展的大趋势下,面向数字化变电站的小电流接地选线装置也必然在不久的将来成为现实。数字化变电站具备很多传统变电站自动化无法实现的优势,在此基础上,新型的小电流接地选线装置将更容易达到实现更高的选线正确率。本文将从硬件和软件方面阐述面向数字化变电站的小电流接地选线的实现。
The low current grounding is widely used in 3 ~ 66k V electricpower grids in China. And more than 80% of the earth faults are caused by single-phase grounding. Researchers have proposed a variety of fault feeder selection methods in the past many years, and all the methodologies are based on the simplified model system to find fault characteristics and then to identify fault feeder selection criterion. At present, many principles and algorithms have been used in business, and hardware devices or software packages have been running in different substations. However, the correctness rate is still not high enough and the result is very dissatisfied yet. Some of the higher correctness rate is realized by the high cost of the device. In recent years, with the electric power system reform, the electricity power grid has been developing very rapidly. With the help of computer technology and communication network technology development, substation automation technology has been in a new stage. Digital substation has been a hot concept for several years, and gradually more and more digital substations are being built. In a digital substation, the analogue and binary inputs from the primary side and the control out from the secondary side are very different from that of a traditional substation automation system. The medium, mode and final accuracy of the data transmission are all improved very much. At present, there have been numerous operating digital substations both in China and other countries. The new-style protection relays, monitoring and control devices and lEDs have entered the stage of practical application at the same time. Then, the new-type device for single-phase earth fault feeder selection to be used in a digital substation is inevitable also. A digital substation has more advantages than a traditional substation so that higher correctness rat for earth fault line selection can be achieved more easily. This paper will describe the realization of selecting the single phase earth fault feeder in a Digital Substation.
The low current grounding is widely used in 3 ~ 66k V electricpower grids in China. And more than 80% of the earth faults are caused by single-phase grounding. Researchers have proposed a variety of fault feeder selection methods in the past many years, and all the methodologies are based on the simplified model system to find fault characteristics and then to identify fault feeder selection criterion. At present, many principles and algorithms have been used in business, and hardware devices or software packages have been running in different substations. However, the correctness rate is still not high enough and the result is very dissatisfied yet. Some of the higher correctness rate is realized by the high cost of the device. In recent years, with the electric power system reform, the electricity power grid has been developing very rapidly. With the help of computer technology and communication network technology development, substation automation technology has been in a new stage. Digital substation has been a hot concept for several years, and gradually more and more digital substations are being built. In a digital substation, the analogue and binary inputs from the primary side and the control out from the secondary side are very different from that of a traditional substation automation system. The medium, mode and final accuracy of the data transmission are all improved very much. At present, there have been numerous operating digital substations both in China and other countries. The new-style protection relays, monitoring and control devices and lEDs have entered the stage of practical application at the same time. Then, the new-type device for single-phase earth fault feeder selection to be used in a digital substation is inevitable also. A digital substation has more advantages than a traditional substation so that higher correctness rat for earth fault line selection can be achieved more easily. This paper will describe the realization of selecting the single phase earth fault feeder in a Digital Substation.
引文
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[3].张庆超,杨金飞.基于两相电流变换的小电流接地系统故障选线新方法.电力系统自动化,2007/08
[4].张晓东.10kV小接地电流系统接地选线的改造方法.电工技术,2007/09
[5].邹浩斌,胡少强,刘利平,孙何洪.基于小扰动原理的单相接地选线装置.继电器,2007/02
[6].曾祥君,王媛媛,庞方亮,李景禄.基于故障电阻测量的小电流接地系统保护方法.高电压技术,2007/01
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[8].郝玉山,杨以涵等.小电流接地微机选线的群体比幅比相原理[J].电力情报,1994,2(2):51-53
[9].贺家李,宋从矩.电力系统继电保护原理[M].北京:中国电力出版社,2001。
[10].檀国彪,涂东明,陈大鹤等.基于最大Isinφ或△Isinφ原理的选线方法[J].中国电力,1995,28(7):16-20
[11].牟龙华.零序电流有功分童方向接地选线保护原理[J].电网技术,1999,23(9):60-62
[12].杜丁香,徐玉琴.消弧线圈接地电网有功选线[J].继电器,2002,30(5):33-36
[13].Al.Shalin,E:NPOlitov.Ground fault protection for 6...10KV distribution system,Power and Electrophysics,2002,430-433
[14].Griffel,LeitloffV,Harmand Y,et al.Anew deal for safety and quality on MV networks[J].IEEE Trans on Power Delivery.1997,12(4):1428-1433
[15].Till Welfonder,Volker Leitloff,Location stralegies and evaluation of detection algorisms for earth faults in compensated MV distribution Systems.IEEE Trans.on Power Delivery,2000,15(4):1121-1128
[16].郝玉山,高曙,杨以涵等,MLN系列小电流接地微机选线装里动作原理[J].电力情报,199 4(2):7-11
[17].陈志亮,范春菊.基于5次谐波突变量的小电流接地系统选线.电力系统及其自动化学报,2006/05
[18].龚静.小电流接地系统单相接地故障的7次谐波选线新方法.电工技术,2005/09
[19].胡佐,李欣然,石吉银.基于残流与首半波综合的接地选线方法研究.2006年电力论坛论文集,2006/08
[20].要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2000
[21].何奔腾,胡为进.能量法小电流接地选线原理[J].浙江大学学报,1998,32(4):451-457
[22].张大波,刘志刚,张亚军,苏玉香.基于相差统计的小电流单相接地选线新判据.电力系统自动化,2007/11
[23].潘露,吕艳萍,于芳,李付敏.基于相频特性与多频带分析的小电流接地系统故障选线.电力系统自动化,2007/04
[24].李健,卢继平,黎颖,何尔文.基于暂态零序电流频带能量的配电系统接地选线方法研究.继电器,2007/11
[25].贾清泉,窦春霞,张华,王春,李鑫滨.配电网单相故障多频带奇异量选线方法.电力系统自动化,2007/02
[26].高艳,林湘宁,刘沛.基于广义形态开闭变换的小电流接地选线算法.中国电机工程学报,2006/03
[27].唐轶,陈庆.基于零序暂态电流方向判断的小电流接地选线方法.电网技术,2007/08
[28].张庆超,张真,杨金飞.多重分形在小电流接地系统单相接地故障选线中的应用.电气应用,2007/08
[29].张庆,王振华.基于协同学理论的小电流接地系统单相接地故障选线方法.电网技术,2007/08
[30].Geise F,Erdschlu β und Erdschlu β Relais[M],Siemens Zeitschrift,1952
[31].Sture L.Sensitive earth fault Protection for MV distribution system[C].209CIRED 1991
[32].薛永端,徐丙垠,冯祖仁,李天友.电流接地故障暂态方向保护原理研究[J].中国电机工程学报,2003,23(7):51-56
[33].苗友忠,孙稚明,杨华.中性点不接地配电系统债线单相接地故障的哲态电流保护新原理[J].中国电机工程学报,24(2):28-32
[34].孙雅明,苗友忠.谐振接地配电系统债线单相接地故障的暂态电流保护新原理.中国电机工程学报,24(3):62-66
[35].束洪春,孙向飞,刘娟,韩武,朱文涛.利用暂态电流的谐振接地电网故障选线自适应新方法.中国电力,2007/07
[36].毕研秋,赵建国.基于暂态量和小波包的配电网故障选线方法.电力自动化设备,2007/06
[37].陈少华,桂存兵,雷宇,马碧燕.基于小波包的永久性单相接地故障的故障选线的仿真研究.继电器,2007/01
[38].李功新.相轨迹用于小电流接地系统单相接地故障检测与选线.高压电器,2007/01
[39].胡佐,成展鹏,庄泽宏.基于暂态零序电流高次谐波衰减故障选线的新思路.低压电器,2007/11
[40].庞清乐,孙同景,钟麦英,杨福刚.基于粗集理论的小电流接地系统故障选线.中国电机工程学报,2007/04
[41].张帆,潘贞存,张慧芬,徐爱东,宋立坤.基于零序电流暂态极大值的小电流接地选线新判据.电力系统自动化,2006/04
[42].廖文.基于面保护原理的小电流接地选线装置.电工技术,2007/05
[43].陈奎,唐轶.单相接地故障综合判据选线研究.电气应用,2007/05
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