技术领域technical field
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利用序分量实现线路单相接地故障单端测距方法。The invention relates to the technical field of electric power system relay protection, in particular to a single-end ranging method for single-phase grounding faults of lines by using sequence components.
背景技术Background technique
输电线路单端故障测距方法仅利用输电线路一端电气量进行故障定位，无须通讯和数据同步设备，运行费用低且算法稳定，在输电线路中获得广泛应用。单端故障测距方法主要分为行波法和阻抗法。行波法利用故障暂态行波的传送性质进行单端故障测距，精度高，不受运行方式、过渡电阻等影响，但对采样率要求很高，需要专门的录波装置，应用成本高。阻抗法利用故障后的电压、电流量计算故障回路阻抗，根据线路长度与阻抗成正比的特性进行单端故障测距，简单可靠，但测距精度受到过渡电阻和负荷电流等因素影响严重，尤其过渡电阻较大时，因过渡电阻引起的附加故障距离的影响，故障距离测量结果会严重偏离真实故障距离，甚至出现故障测距失败。The single-end fault location method of transmission lines only uses the electrical quantity at one end of the transmission line for fault location, does not require communication and data synchronization equipment, has low operating costs and stable algorithms, and has been widely used in transmission lines. Single-ended fault location methods are mainly divided into traveling wave method and impedance method. The traveling wave method utilizes the transmission properties of fault transient traveling waves to perform single-ended fault location. It has high precision and is not affected by the operation mode and transition resistance. However, it requires a high sampling rate, requires a special wave recording device, and has high application costs. . The impedance method uses the voltage and current after the fault to calculate the fault loop impedance, and performs single-ended fault distance measurement according to the characteristic that the line length is proportional to the impedance. It is simple and reliable, but the distance measurement accuracy is seriously affected by factors such as transition resistance and load current, especially When the transition resistance is large, due to the influence of the additional fault distance caused by the transition resistance, the measurement result of the fault distance will seriously deviate from the real fault distance, and even the failure of fault distance measurement will occur.
发明内容Contents of the invention
本发明的目的在于克服已有技术存在的不足，提供一种测距精度不受过渡电阻、负荷电流和故障位置影响的利用序分量实现线路单相接地故障单端测距方法。The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a single-terminal distance measurement method for single-phase grounding faults of lines by using sequence components, in which the distance measurement accuracy is not affected by transition resistance, load current and fault location.
利用序分量实现线路单相接地故障单端测距方法，其特征在于，包括如下依序步骤：Utilizing the sequence component to realize the method for single-terminal distance measurement of line single-phase grounding fault, it is characterized in that, comprises the following sequential steps:
(1)保护装置测量输电线路保护安装处的故障相负序电压故障相负序电流零序电压和零序电流其中，φ为A相、B相、C相；(1) The protection device measures the fault phase negative sequence voltage at the protection installation of the transmission line Fault phase negative sequence current Zero sequence voltage and zero sequence current Among them, φ is A phase, B phase, C phase;
(2)保护装置计算输电线路保护安装处到单相接地故障点的故障距离其中，φ为A相、B相、C相；z1为单位长度输电线路正序阻抗；z0为单位长度输电线路零序阻抗；为故障相负序电压；为故障相负序电流；为零序电压；为零序电流。(2) The protection device calculates the fault distance from the transmission line protection installation to the single-phase ground fault point Among them, φ is phase A, phase B, and phase C; z1 is the positive sequence impedance of the transmission line per unit length; z0 is the zero sequence impedance of the transmission line per unit length; is the fault phase negative sequence voltage; is the fault phase negative sequence current; is the zero-sequence voltage; is the zero sequence current.
本发明与现有技术相比较，具有以下积极成果：Compared with the prior art, the present invention has the following positive results:
本发明方法首先将输电线路单相接地故障点的负序电压转化为等效零序电压，根据输电线路单相接地故障点的零序电压与等效零序电压相等这一故障特征精确计算故障距离，实现了输电线路单相接地故障的单端测距。本发明方法根据输电线路沿线零序电压分布特性实现输电线路单相接地故障单端测距，原理上消除了过渡电阻对测距精度的影响，不受负荷电流和故障位置的影响，具有很高的测距精度。本发明方法测距原理简单，程序实现容易，且无需采用搜索算法直接计算故障距离，测距速度快，实时性强。The method of the invention first converts the negative-sequence voltage of the single-phase ground fault point of the transmission line into an equivalent zero-sequence voltage, and accurately calculates the fault according to the fault characteristic that the zero-sequence voltage of the single-phase ground fault point of the transmission line is equal to the equivalent zero-sequence voltage It realizes the single-end distance measurement of the single-phase ground fault of the transmission line. The method of the invention realizes the single-end distance measurement of the single-phase grounding fault of the transmission line according to the distribution characteristics of the zero-sequence voltage along the transmission line, eliminates the influence of the transition resistance on the distance measurement accuracy in principle, and is not affected by the load current and the fault position, and has a high distance measurement accuracy. The method of the invention has a simple ranging principle, easy program realization, and does not need to use a search algorithm to directly calculate the fault distance, and has fast ranging speed and strong real-time performance.
附图说明Description of drawings
图1为应用本发明的线路输电系统示意图。Fig. 1 is a schematic diagram of a line transmission system applying the present invention.
具体实施方式detailed description
下面结合实施例对本发明的技术方案做进一步详细表述。The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.
图1为应用本发明的线路输电系统示意图。图1中CVT为电压互感器、CT为电流互感器。保护装置对输电线路保护安装处的电压互感器CVT的电压和电流互感器CT的电流波形进行采样得到电压、电流瞬时值，然后保护装置对其采集到的电压、电流瞬时值利用傅里叶算法计算输电线路保护安装处的故障相负序电压故障相负序电流零序电压和零序电流其中，φ为A相、B相、C相。Fig. 1 is a schematic diagram of a line transmission system applying the present invention. In Fig. 1, CVT is a voltage transformer, and CT is a current transformer. The protection device samples the voltage of the voltage transformer CVT and the current waveform of the current transformer CT at the installation place of the transmission line protection to obtain the instantaneous value of voltage and current, and then the protection device uses the Fourier algorithm for the collected instantaneous value of voltage and current Calculation of fault phase negative-sequence voltage at transmission line protection installation Fault phase negative sequence current Zero sequence voltage and zero sequence current Among them, φ is A phase, B phase, and C phase.
保护装置将输电线路单相接地故障点的负序电压转化为等效零序电压The protection device converts the negative-sequence voltage of the single-phase-to-ground fault point of the transmission line Converted to equivalent zero-sequence voltage
保护装置根据等效零序电压等于输电线路单相接地故障点的零序电压这一故障特征即直接计算输电线路保护安装处到单相接地故障点的故障距离
其中，φ为A相、B相、C相；z1为单位长度输电线路正序阻抗；z0为单位长度输电线路零序阻抗；为故障相负序电压；为故障相负序电流；为零序电压；为零序电流。Among them, φ is phase A, phase B, and phase C; z1 is the positive sequence impedance of the transmission line per unit length; z0 is the zero sequence impedance of the transmission line per unit length; is the fault phase negative sequence voltage; is the fault phase negative sequence current; is the zero-sequence voltage; is the zero sequence current.
本发明方法首先将输电线路单相接地故障点的负序电压转化为等效零序电压，根据输电线路单相接地故障点的零序电压与等效零序电压相等这一故障特征精确计算故障距离，实现了输电线路单相接地故障的单端测距。本发明方法根据输电线路沿线零序电压分布特性实现输电线路单相接地故障单端测距，原理上消除了过渡电阻对测距精度的影响，不受负荷电流和故障位置的影响，具有很高的测距精度。本发明方法测距原理简单，程序实现容易，且无需采用搜索算法直接计算故障距离，测距速度快，实时性强。The method of the invention first converts the negative-sequence voltage of the single-phase ground fault point of the transmission line into an equivalent zero-sequence voltage, and accurately calculates the fault according to the fault characteristic that the zero-sequence voltage of the single-phase ground fault point of the transmission line is equal to the equivalent zero-sequence voltage It realizes the single-end distance measurement of the single-phase ground fault of the transmission line. The method of the invention realizes the single-end distance measurement of the single-phase grounding fault of the transmission line according to the distribution characteristics of the zero-sequence voltage along the transmission line, eliminates the influence of the transition resistance on the distance measurement accuracy in principle, and is not affected by the load current and the fault position, and has a high distance measurement accuracy. The method of the invention has a simple ranging principle, easy program realization, and does not need to use a search algorithm to directly calculate the fault distance, and has fast ranging speed and strong real-time performance.
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。The above descriptions are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto, any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention , should be covered within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185058.3ACN103293440B (en) | 2013-05-19 | 2013-05-19 | Order components is utilized to realize line single-phase earth fault single-terminal location method |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185058.3ACN103293440B (en) | 2013-05-19 | 2013-05-19 | Order components is utilized to realize line single-phase earth fault single-terminal location method |
| Publication Number | Publication Date |
|---|---|
| CN103293440A CN103293440A (en) | 2013-09-11 |
| CN103293440Btrue CN103293440B (en) | 2016-06-01 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310185058.3AActiveCN103293440B (en) | 2013-05-19 | 2013-05-19 | Order components is utilized to realize line single-phase earth fault single-terminal location method |
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| CN (1) | CN103293440B (en) |
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