WO2014117616A1 - 一种输电线路单相接地故障全分量电压保护方法 - Google Patents

一种输电线路单相接地故障全分量电压保护方法 Download PDF

Info

Publication number
WO2014117616A1
WO2014117616A1 PCT/CN2013/090857 CN2013090857W WO2014117616A1 WO 2014117616 A1 WO2014117616 A1 WO 2014117616A1 CN 2013090857 W CN2013090857 W CN 2013090857W WO 2014117616 A1 WO2014117616 A1 WO 2014117616A1
Authority
WO
WIPO (PCT)
Prior art keywords
protection
fault
transmission line
phase
ground fault
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/090857
Other languages
English (en)
French (fr)
Inventor
林富洪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
State Grid Corp of China SGCC
Original Assignee
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
State Grid Corp of China SGCC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Fujian Electric Power Co Ltd, Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd, State Grid Corp of China SGCC filed Critical State Grid Fujian Electric Power Co Ltd
Publication of WO2014117616A1 publication Critical patent/WO2014117616A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires

Definitions

  • the invention relates to the technical field of power system relay protection, in particular to a full-phase voltage protection method for single-phase ground fault of a transmission line. Background technique
  • Transmission line distance protection can be divided into line distance protection based on sudden change and line distance protection based on full component according to different electrical quantities.
  • Line distance protection based on sudden change is affected by system operation mode and strong resistance to transition resistance. This type of protection action has high reliability.
  • the line distance protection based on the sudden change For a line fault after two cycles, it cannot provide relay protection, and it cannot be applied to the protection of the entire fault process of the line.
  • the full-component line distance protection can be applied to the protection of the entire fault process of the line, the self-protection algorithm is seriously affected by the transition resistance. In the case of high-resistance ground fault, protection against jeopardy or misoperation is easy, and the protection reliability is not high. .
  • the object of the present invention is to overcome the deficiencies of the prior art and provide a full-component voltage protection method for a single-phase ground fault of a transmission line.
  • a full-phase voltage protection method for single-phase ground fault of transmission line the steps are as follows:
  • ⁇ is the fault phase current; is the fault phase negative sequence current; / ⁇ zero sequence current; ⁇ B, C phase; is the phase angle of the fault phase negative sequence current; They are the positive sequence and zero sequence impedance of the transmission line per unit length.
  • the present invention has the following advantages over the prior art:
  • the voltage drop amplitude along the line from the protection line protection installation to the single-phase ground fault point is smaller than the voltage drop amplitude from the protection installation to the protection setting range;
  • the voltage drop amplitude along the line from the protection line installation to the single-phase ground fault point is greater than the voltage drop amplitude from the protection installation to the protection setting range, to achieve full-phase voltage protection of the single-phase ground fault of the transmission line, and the performance It is not affected by the system operation mode and load current, and eliminates the influence of the transition resistance on the protection action performance. It is suitable for the protection of the entire fault process of the single-phase ground fault of the transmission line.
  • FIG. 1 is a schematic diagram of a line transmission system to which the present invention is applied. detailed description
  • ⁇ - ⁇ is z o ⁇ The real part of z i L f .
  • Distribution characteristics of voltage drop along the transmission line after single-phase ground fault When the fault occurs in the protection zone, the voltage drop amplitude along the line from the protection line installation point to the single-phase ground fault point is less than the voltage drop range from the protection installation to the protection setting range. Value; When the protection outside the protection zone occurs, the voltage drop amplitude along the line from the protection line installation to the single-phase ground fault point is greater than the voltage drop amplitude from the protection installation to the protection setting range. Therefore, the method of the invention is guaranteed If ⁇ ( ⁇ )] 2 + [ ⁇ )] 2 ⁇
  • 0 is the protection setting range; , Z. They are the positive sequence and zero sequence impedance of the transmission line per unit length.
  • the method of the invention utilizes the voltage drop distribution characteristic along the line (ie, the voltage drop amplitude along the line from the transmission line protection installation to the single-phase ground fault point is smaller than the voltage drop amplitude from the protection installation to the protection setting range when the fault occurs in the protection zone; In the case of an out-of-zone fault, the amplitude of the voltage drop along the transmission line protection installation to the single-phase ground fault point is greater than the voltage drop amplitude from the protection installation to the protection setting range.)
  • the full-voltage protection of the single-phase ground fault of the transmission line is realized. The performance is not affected by the system operation mode and load current, and the effect of the transition resistance on the protection action performance is eliminated. It is suitable for the protection of the entire fault process of the single-phase ground fault of the transmission line.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

本发明公开了一种输电线路单相接地故障全分量电压保护方法。本发明方法利用沿线电压降落分布特性（即保护区内故障时，输电线路保护安装处到单相接地故障点的沿线电压降落幅值小于保护安装处到保护整定范围处的电压降落幅值；保护区外故障时，输电线路保护安装处到单相接地故障点的沿线电压降落幅值大于保护安装处到保护整定范围处的电压降落幅值）实现了输电线路单相接地故障全分量电压保护，动作性能既不受系统运行方式和负荷电流的影响，又消除了过渡电阻对保护动作性能的影响，适用于输电线路单相接地故障的整个故障过程的保护。

Description

一种输电线路单相接地故障全分量电压保护方法 技术领域
本发明涉及电力系统继电保护技术领域， 特别是一种输电线路单相接地故障全分量电压保护方法。 背景技术
输电线路距离保护根据采用电气量不同可分为基于突变量的线路距离保护和基于全分量的线路距离 保护两类。 基于突变量的线路距离保护受系统运行方式影响小和抗过渡电阻能力强， 此类保护动作性能可 靠性高， 但由于电气突变量只在故障后两周波内存在， 基于突变量的线路距离保护对于两周波后的线路故 障无法起到继电保护作用， 无法适用于线路整个故障过程的保护。 基于全分量的线路距离保护虽可适用于 线路整个故障过程的保护， 但由于自身保护算法受过渡电阻的影响严重， 在高阻接地故障时容易发生保护 拒动或误动， 保护可靠性不高。
发明内容
本发明的目的在于克服已有技术存在的不足， 提供一种输电线路单相接地故障全分量电压保护方法。 一种输电线路单相接地故障全分量电压保护方法， 其步骤如下：
( 1 )测量输电线路保护安装处的故障相电压 ύφ、故障相电流 ϊψ、故障相负序电流 ϊφι和零序电流 i0 其中， 0 =A、 B、 C相。
(2 ) 计算输电线路保护安装处到单相接地故障点的电压降 Δί^的实部 Re(At^)和虚部 Im(At^) ：
Figure imgf000003_0001
其中， 为故障相电压； ^为故障相电流； 为故障相负序电流； /ο为零序电流； φ B、 C 相； 为故障相负序电流 的相位角； 、 ζ。分别为单位长度输电线路正序、 零序阻抗。
(3 ) 比较保护判据 < \xsetzjset\是否成立， 若成立， 则保护动作； 其中，
Figure imgf000003_0002
/ Xiei为保护整定范围
+
综上所述， 本发明相比现有技术具有如下优点：
z
o
本发明方法利用沿线电压降落分布特性即保护区内故障时， 输电线路保护安装处到单相接地故障点的 沿线电压降落幅值小于保护安装处到保护整定范围处的电压降落幅值； 保护区外故障时， 输电线路保护安 装处到单相接地故障点的沿线电压降落幅值大于保护安装处到保护整定范围处的电压降落幅值， 实现输电 线路单相接地故障全分量电压保护， 动作性能既不受系统运行方式和负荷电流的影响， 又消除了过渡电阻 对保护动作性能的影响， 适用于输电线路单相接地故障的整个故障过程的保护。 附图说明
图 1为应用本发明的线路输电系统示意图。 具体实施方式
下面结合说明书附图对本发明的技术方案做进一步详细表述。
保护装置测量输电线路保护安装处的故障相电压 ύφ、 故障相电流 ϊφ、 故障相负序电流 ϊφ1和零序电 流 /θ ; 其中， φ = 、 B、 C相。 计算输电线路保护安装处到单相接地故障点的电压降 At^的实部 Re(At^)
Figure imgf000004_0001
计算输电线路保护安装处到单相接地故障点的电压降 Atif的虚部 Im(At^)
Figure imgf000004_0002
其中， 为故障相负序电流 的相位角； Re 为故障相电压 的实部； Im(f^ )为故障相电压 ί ( 的虚 部 ； Im 为 -Ό 的虚 部 ； Re i + ZQ ~ zi /
ζι -Ό 为
Figure imgf000004_0003
zo― zi L f 的实部。 输电线路发生单相接地故障后沿线电压降落分布特点： 保护区内故障时， 输电线路保护安装处到单相 接地故障点的沿线电压降落幅值小于保护安装处到保护整定范围处的电压降落幅值； 保护区外故障时， 输 电线路保护安装处到单相接地故障点的沿线电压降落幅值大于保护安装处到保护整定范围处的电压降落 幅值。 因此， 得到本发明方法的保
Figure imgf000005_0001
若 ^^(Δ^)]2 + [ Δ^)]2 < |xieiZl/iei |成立， 则保护动作。其中， ϊίβΓϊφ ζ1— z0 j
0 为 保护整定范围； 、 Z。分别为单位长度输电线路正序、 零序阻抗。 本发明方法利用沿线电压降落分布特性（即保护区内故障时， 输电线路保护安装处到单相接地故障点 的沿线电压降落幅值小于保护安装处到保护整定范围处的电压降落幅值； 保护区外故障时， 输电线路保护 安装处到单相接地故障点的沿线电压降落幅值大于保护安装处到保护整定范围处的电压降落幅值）实现了 输电线路单相接地故障全分量电压保护， 动作性能既不受系统运行方式和负荷电流的影响， 又消除了过渡 电阻对保护动作性能的影响， 适用于输电线路单相接地故障的整个故障过程的保护。
以上所述仅为本发明的较佳具体实施例， 但本发明的保护范围并不局限于此， 任何熟悉本技术领域的 技术人员在本发明揭露的技术范围内， 可轻易想到的变化或替换， 都应涵盖在本发明的保护范围之内。

Claims

权 利 要 求 书
1、 一 +种输电线路单相接地故障全分量电压保护方法， 其步骤如下：
Z1
( 1 )测量输电线路保护安装处的故障相电压 ύφ、故障相电流 ϊψ、故障相负序电流 ϊφι和零序电流 i0
Z
o
其中， φ = 、 B、 C相，
(2 ) 计算输电线路保护安装处到单相接地故障点的电压降 Δί^的实部 Re(At^)和虚部 Im(At^) ：
Figure imgf000006_0001
其中， 为故障相电压； ^为故障相电流； 为故障相负序电流； /ο为零序电流； φ二 B、 C 相； 为故障相负序电 的相位角； 、 ζ。分别为单位长度输电线路正序、 零序阻抗，
(3 ) 比较保护判据 < \xsetzjset \是否成立， 若成立， 则保护动作； 其中
Figure imgf000006_0002
10 为保护整定范围
Z
PCT/CN2013/090857 2013-01-31 2013-12-30 一种输电线路单相接地故障全分量电压保护方法 Ceased WO2014117616A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310042967.1 2013-01-31
CN201310042967.1A CN103151764B (zh) 2013-01-31 2013-01-31 一种输电线路单相接地故障全分量电压保护方法

Publications (1)

Publication Number Publication Date
WO2014117616A1 true WO2014117616A1 (zh) 2014-08-07

Family

ID=48549695

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2013/090857 Ceased WO2014117616A1 (zh) 2013-01-31 2013-12-30 一种输电线路单相接地故障全分量电压保护方法

Country Status (2)

Country Link
CN (1) CN103151764B (zh)
WO (1) WO2014117616A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103151764B (zh) * 2013-01-31 2014-12-31 福建省电力有限公司 一种输电线路单相接地故障全分量电压保护方法
CN104852365B (zh) * 2015-05-15 2018-11-06 国家电网公司 基于单端电气量特高压交流输电线路三相短路故障判别方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5773980A (en) * 1997-01-30 1998-06-30 Abb Power T&D Company, Inc. One-terminal fault location system that corrects for fault resistance effects
CN101291056A (zh) * 2007-04-17 2008-10-22 上海申瑞电力科技股份有限公司 一种长线模型故障选相方法
CN101325330A (zh) * 2008-07-30 2008-12-17 北京四方继保自动化股份有限公司 一种接地距离测量元件的实现方法
CN102023275A (zh) * 2010-09-27 2011-04-20 华北电力大学 基于定位函数相位突变特性的线路单端测距方法
CN102175952A (zh) * 2011-01-28 2011-09-07 华北电力大学 一种线路单相接地距离测量方法
CN103151764A (zh) * 2013-01-31 2013-06-12 福建省电力有限公司 一种输电线路单相接地故障全分量电压保护方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1858953A (zh) * 2006-06-02 2006-11-08 北京四方继保自动化股份有限公司 基于本地零序电压补偿的零序功率方向的保护方法
ATE513223T1 (de) * 2006-12-29 2011-07-15 Abb Technology Ag System und verfahren zur ortung eines einpoligen erdschlusses
US7599161B2 (en) * 2006-12-29 2009-10-06 General Electric Company Relay device and corresponding method
EP2000811B1 (en) * 2007-05-18 2017-12-13 ABB Schweiz AG Method for determining location of phase-to-earth fault

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5773980A (en) * 1997-01-30 1998-06-30 Abb Power T&D Company, Inc. One-terminal fault location system that corrects for fault resistance effects
CN101291056A (zh) * 2007-04-17 2008-10-22 上海申瑞电力科技股份有限公司 一种长线模型故障选相方法
CN101325330A (zh) * 2008-07-30 2008-12-17 北京四方继保自动化股份有限公司 一种接地距离测量元件的实现方法
CN102023275A (zh) * 2010-09-27 2011-04-20 华北电力大学 基于定位函数相位突变特性的线路单端测距方法
CN102175952A (zh) * 2011-01-28 2011-09-07 华北电力大学 一种线路单相接地距离测量方法
CN103151764A (zh) * 2013-01-31 2013-06-12 福建省电力有限公司 一种输电线路单相接地故障全分量电压保护方法

Also Published As

Publication number Publication date
CN103151764B (zh) 2014-12-31
CN103151764A (zh) 2013-06-12

Similar Documents

Publication Publication Date Title
CN108872791B (zh) 小电阻接地配电网的单相高阻接地故障识别以及保护方法
CN103390888B (zh) 一种零序有功分量保护判据
CN103762569B (zh) 同杆并架双回线路两相接地短路故障方向判别方法
CN104779602A (zh) 基于有源逆变的谐振接地系统零序电压柔性控制方法
CN105866608A (zh) 基于阻性电流通流唯一特性的配电网故障选线方法
CN103872666A (zh) 一种基于电压平面的负荷与单相接地故障识别方法
CN103760458B (zh) 同杆并架双回线路单相接地故障方向判别方法
CN105655976A (zh) 一种发电机定子接地保护方法
CN104078955A (zh) 基于动作边界自适应调整输电线路相间故障继电保护方法
CN103166204B (zh) 一种基于附加阻抗实测修正的线路相间故障阻抗距离保护方法
CN103219713A (zh) 一种输电线路相间短路故障距离保护方法
CN103227455B (zh) 基于故障阻抗相位特性的线路单相接地故障继电保护方法
WO2014117616A1 (zh) 一种输电线路单相接地故障全分量电压保护方法
WO2014135093A1 (zh) 一种特高压交流输电线路单相接地故障类型诊断方法
CN106291221B (zh) 一种同塔双回输电线路相邻线断线识别方法
CN103760472B (zh) 同杆并架双回线路同名故障相序诊断方法
CN103746335A (zh) 基于幅值比较原理的继电保护方法
CN103248019B (zh) 输电线路相间短路故障继电保护方法
CN103368153A (zh) 基于加速因子的输电线路负序电流保护方法
CN105703340A (zh) 基于动作边界自适应调整输电线路单相接地故障继电保护方法
CN103248037B (zh) 中性点经消弧线圈接地的配电网阻尼回路参数整定方法
CN103296656B (zh) 具有选相功能的输电线路复合序分量电压保护方法
CN103762573A (zh) 输电线路自适应零序电流保护方法
CN103368152A (zh) 输电线路单相高阻接地故障电流保护方法
CN102830329A (zh) 一种输电线路故障方向计算方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13873626

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13873626

Country of ref document: EP

Kind code of ref document: A1