WO2014135089A1 - 一种特高压交流输电线路单相接地故障点电压测量方法 - Google Patents

一种特高压交流输电线路单相接地故障点电压测量方法 Download PDF

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WO2014135089A1
WO2014135089A1 PCT/CN2014/072949 CN2014072949W WO2014135089A1 WO 2014135089 A1 WO2014135089 A1 WO 2014135089A1 CN 2014072949 W CN2014072949 W CN 2014072949W WO 2014135089 A1 WO2014135089 A1 WO 2014135089A1
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transmission line
uhv
phase
fault
voltage
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French (fr)
Inventor
曾惠敏
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State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
State Grid Corp of China SGCC
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State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
State Grid Corp of China SGCC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for AC systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/38—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to both voltage and current; responsive to phase angle between voltage and current
    • H02H3/387—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to both voltage and current; responsive to phase angle between voltage and current using phase-sequence analysing arrangements

Definitions

  • the invention relates to the technical field of power system relay protection, in particular to a method for measuring a single-phase ground fault point voltage of an UHV AC transmission line.
  • the low-medium-high-resistance grounding fault type of the UHV AC transmission line can be diagnosed online according to the magnitude of the single-phase grounding fault point voltage, which is the UHV AC transmission.
  • the line fault line provides a reference basis to gain valuable time for troubleshooting and restoring power.
  • the object of the present invention is to overcome the deficiencies of the prior art and to provide a voltage measurement method for a single-phase ground fault point of an UHV AC transmission line.
  • the method of the invention uses the long-line equation to describe the physical characteristics of voltage and current transmission of the UHV AC transmission line, and estimates the phase phase of the single-phase ground fault point of the UHV AC transmission line by using the phase sequence of the fault phase of the fault phase of the UHV AC transmission line protection installation. Angle, according to the hyperbolic tangent function relationship between the voltage drop along the UHV AC transmission line and the fault distance, the single-phase ground fault point voltage of the UHV AC transmission line is calculated. The measurement result is not affected by the distributed capacitance, transition resistance, fault location and load current. , with high measurement accuracy.
  • a single-phase ground fault point voltage measurement method for an UHV AC transmission line includes the following steps:
  • the data acquisition system of the protection device transmits the fault phase electrical quantity measured to the protection installation of the UHV AC transmission line to the data processing system of the protection device.
  • the data processing system of the protection device utilizes the UHV AC transmission line protection installation.
  • the fault phase electrical quantity calculates the single-phase ground fault point voltage Of the UHV AC transmission line.
  • 0 is a hyperbolic cosine function, which is a hyperbolic sine function
  • I is a hyperbolic tangent function
  • the method of the invention uses the long-line equation to describe the physical characteristics of voltage and current transmission of the UHV AC transmission line, and estimates the phase phase of the single-phase ground fault point of the UHV AC transmission line by using the phase sequence of the fault phase of the fault phase of the UHV AC transmission line protection installation. Angle, according to the hyperbolic tangent function relationship between the voltage drop along the UHV AC transmission line and the fault distance, the single-phase ground fault point voltage of the UHV AC transmission line is calculated. The measurement result is not affected by the distributed capacitance, transition resistance, fault location and load current. , with high measurement accuracy. DRAWINGS
  • FIG. 1 is a schematic diagram of a power transmission system of an ultra-high voltage AC transmission line to which the present invention is applied. detailed description
  • the data acquisition system of the protection device measures the fault phase voltage ⁇ , the fault phase current, the fault phase negative sequence current 2 and the zero sequence of the UHV AC transmission line protection installation.
  • the data acquisition system of the protection device transmits the electrical quantity of the single-phase ground fault phase measured to the protection installation of the UHV AC transmission line to the data processing system of the protection device.
  • the data processing system of the protection device calculates the single-phase ground fault point voltage of the UHV AC transmission line by using the fault phase electrical quantity of the UHV AC transmission line protection installation.
  • the method of the invention uses the long-line equation to describe the physical characteristics of voltage and current transmission of the UHV AC transmission line, and estimates the phase phase of the single-phase ground fault point of the UHV AC transmission line by using the phase sequence of the fault phase of the fault phase of the UHV AC transmission line protection installation. Angle, according to the hyperbolic tangent function relationship between the voltage drop along the UHV AC transmission line and the fault distance, the single-phase ground fault point voltage of the UHV AC transmission line is calculated. The measurement result is not affected by the distributed capacitance, transition resistance, fault location and load current. , with high measurement accuracy.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

本发明公开了一种特高压交流输电线路单相接地故障点电压测量方法。本发明方法采用长线方程描述特高压交流输电线路电压、电流传输的物理特性，利用特高压交流输电线路保护安装处的故障相负序电流相角估算特高压交流输电线路单相接地故障点电压相角，根据特高压交流输电线路沿线电压降落与故障距离呈双曲正切函数关系计算特高压交流输电线路单相接地故障点电压。本发明方法采用长线方程和单端故障相电气量实现了特高压交流输电线路单相接地故障点电压的精确测量，测量结果不受分布电容、过渡电阻、故障位置和负荷电流的影响，具有很高的测量精度。

Description

一种特高压交流输电线路单相接地故障点电压测量方法
技术领域
本发明涉及电力系统继电保护技术领域， 具体地说是涉及一种特高压交流输电线路单相接地故障点电 压测量方法。
背景技术
通过对特高压交流输电线路单相接地故障点电压的实时测量， 有利于及时掌握单相接地故障对特高 压交流输电线路热稳定和动稳定的影响情况， 为确保特高压交流输电线路安全和电网稳定提供可靠的决 策依据。
通过对特高压交流输电线路单相接地故障点电压的实时测量， 可根据单相接地故障点电压幅值大小 情况对特高压交流输电线路低中高电阻接地故障类型进行在线诊断， 为特高压交流输电线路故障巡线提 供参考依据， 为排除故障和恢复供电赢得宝贵时间。
发明内容
本发明的目的在于克服已有技术存在的不足， 提供一种特高压交流输电线路单相接地故障点电压测量 方法。 本发明方法采用长线方程描述特高压交流输电线路电压、 电流传输的物理特性， 利用特高压交流输 电线路保护安装处的故障相负序电流相角估算特高压交流输电线路单相接地故障点电压相角， 根据特高压 交流输电线路沿线电压降落与故障距离呈双曲正切函数关系计算特高压交流输电线路单相接地故障点电 压， 测量结果不受分布电容、 过渡电阻、 故障位置和负荷电流的影响， 具有很高的测量精度。
一种特高压交流输电线路单相接地故障点电压测量方法， 包括以下步骤：
( 1 ) 保护装置的数据采集系统测量特高压交流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 2和零序电流 ; 其中， φ = Α、 B、 C相。
(2) 保护装置的数据采集系统将其测量到特高压交流输电线路保护安装处的故障相电气量传送给保 护装置的数据处理系统， 保护装置的数据处理系统利用特高压交流输电线路保护安装处的故障相电气量计 算特高压交流输电线路单相接地故障点电压 Of ：
• Re(l)≠ )sin(y9 + θ)- Ιπι(ίίφ )cos(y9 + θ)
U f = -, r J-1-—— r (cos a + j sin a)
J cos or sin y9 + Θ) - cos(/9 + 0)sm a 其中， =A、 B、 C相； 为保护整定范围； Zo为特高压交流输电线路保护安装处的系统零序等 值阻抗； 、 分别为特高压交流输电线路正序、 零序传播系数； Zel、 Ze()分别为特高压交流输电线 路正序、零序波阻抗； [^为故障相电压； 为故障相电流； a = Arg(i<p2 ) ; = ^^2^ 2^/^》； /, 2 为故障相负序电流； /ο为零序电流； = -1
Figure imgf000004_0001
0为双曲余弦函数， 为双曲正弦函数， I为双曲正切函数。 综上所述， 本发明相比现有技术具有如下优点：
本发明方法采用长线方程描述特高压交流输电线路电压、 电流传输的物理特性， 利用特高压交流输电 线路保护安装处的故障相负序电流相角估算特高压交流输电线路单相接地故障点电压相角， 根据特高压交 流输电线路沿线电压降落与故障距离呈双曲正切函数关系计算特高压交流输电线路单相接地故障点电压， 测量结果不受分布电容、 过渡电阻、 故障位置和负荷电流的影响， 具有很高的测量精度。 附图说明
图 1为应用本发明的特高压交流输电线路的输电系统示意图。 具体实施方式
下面根据说明书附图对本发明的技术方案做进一步详细表述。
如图 1， 特高压交流输电线路发生单相接地故障后， 保护装置的数据采集系统测量特高压交流输电线 路保护安装处的故障相电压 ø、 故障相电流 、故障相负序电流 2和零序电流 /Q ; 其中， φ = Α、 Β、 C相。
保护装置的数据采集系统将其测量到特高压交流输电线路保护安装处的单相接地故障相电气量传送 给保护装置的数据处理系统。
保护装置的数据处理系统利用其接收到的特高压交流输电线路保护安装处的故障相电气量计算特高 压交流输电线路单相接地故障点电压 ύ f
Figure imgf000004_0002
其中， =A、 B、 C相； 为保护整定范围； ^。为特高压交流输电线路保护安装处的系统零序等值 阻抗； 、 分别为特高压交流输电线路正序、 零序传播系数； Zel、 ZeQ分别为特高压交流输电线路正 序、 零序波阻抗； [^为故障相电压； 为故障相电流； = ^rg(^2 ) ; = rg(Zeliz ^》； 为 故障相负序电流； /o为零序电流； 6 = Arg -1
Figure imgf000004_0003
为双曲余弦函数， 为双曲正弦函数， I为双曲正切函数。 本发明方法采用长线方程描述特高压交流输电线路电压、 电流传输的物理特性， 利用特高压交流输电 线路保护安装处的故障相负序电流相角估算特高压交流输电线路单相接地故障点电压相角， 根据特高压交 流输电线路沿线电压降落与故障距离呈双曲正切函数关系计算特高压交流输电线路单相接地故障点电压， 测量结果不受分布电容、 过渡电阻、 故障位置和负荷电流的影响， 具有很高的测量精度。
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、 一种特高压交流输电线路单相接地故障点电压测量方法， 包括如下步骤：
(1) 保护装置的数据采集系统测量特高压交流输电线路保护安装处的故障相电压 ί^、 故障相电流 ίφ, 故障相负序电流 2和零序电流 ο; 其中， φ = Α、 Β、 C相，
(2) 保护装置的数据采集系统将其测量到特高压交流输电线路保护安装处的故障相电气量传送给保 护装置的数据处理系统， 保护装置的数据处理系统利用特高压交流输电线路保护安装处的故障相电气量计 算特高压交流输电线路单相接地故障点电压 i f ：
Re(i>0 )sin(^ +θ)- Ιν^ύφ )οο5{β + θ) . .
U f = - r -f r (cos a + js a)
J cos asin + Θ)- cos + ^jsin a 其中， =A、 B、 C相； 为保护整定范围； 2()为特高压交流输电线路保护安装处的系统零序等值 阻抗； 分别为特高压交流输电线路正序、 零序传播系数； Zel、 ZeQ分别为特高压交流输电线路正 序、 零序波阻抗； 为故障相电压； 为故 故障相负序电流； /ο为零序电流； 6 = Arg
Figure imgf000006_0001
为双曲余弦函数， ^0为双曲正弦函数， I为双曲正切函数。
PCT/CN2014/072949 2013-03-06 2014-03-06 一种特高压交流输电线路单相接地故障点电压测量方法 Ceased WO2014135089A1 (zh)

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CN105703339A (zh) * 2016-03-29 2016-06-22 国网福建省电力有限公司 特高压交流输电线路单相接地电压相位保护方法
CN105896486A (zh) * 2016-03-29 2016-08-24 国网福建省电力有限公司 基于相邻线路零序电流实测的双回线路非同名相跨线接地故障复合电压保护方法
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CN112485601A (zh) * 2020-12-11 2021-03-12 国网四川省电力公司电力科学研究院 基于双端线路电气量信息的故障分析方法和系统

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CN104764921B (zh) * 2015-03-04 2018-08-28 国家电网公司 基于分布参数模型线路单相接地故障点电压测量方法
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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
CN103176032A (zh) * 2013-03-06 2013-06-26 福建省电力有限公司 一种特高压交流输电线路单相接地故障点电压测量方法

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CN105703339A (zh) * 2016-03-29 2016-06-22 国网福建省电力有限公司 特高压交流输电线路单相接地电压相位保护方法
CN105896486A (zh) * 2016-03-29 2016-08-24 国网福建省电力有限公司 基于相邻线路零序电流实测的双回线路非同名相跨线接地故障复合电压保护方法
CN112485601A (zh) * 2020-12-11 2021-03-12 国网四川省电力公司电力科学研究院 基于双端线路电气量信息的故障分析方法和系统
CN112485601B (zh) * 2020-12-11 2023-08-25 国网四川省电力公司电力科学研究院 基于双端线路电气量信息的故障分析方法和系统

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