CN103219712B - Based on the power transmission line one-phase malfunction property identification method of natural frequency - Google Patents
Based on the power transmission line one-phase malfunction property identification method of natural frequency Download PDFInfo
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Abstract
本发明公开了基于固有频率的输电线路单相故障性质识别方法，具体按照以下步骤实施：1）在输电线路单相故障跳闸后，采集故障相电流i(t)，经高通滤波等信号调理步骤之后再进行Prony分析，在Prony分析结果中提取出暂态分量的固有频率主频f1(k)；2）将步骤1）中获取的主频频率f1(k)与电力系统工频f0(k)进行比较，构造合理的判据然后根据判据，即f1(k)>Kre·f0(k)；3）根据步骤2）构造的判据进行输电线路单相故障性质识别。本发明的无故障识别方法不仅解决了现有输电线路单相故障识别方法易受电弧模型、故障时刻、线路长度、负荷电流、过渡电阻及补偿度因素影响的问题，还解决了现有固定时限的重合闸存在重合于未熄弧瞬时故障的问题进一步提高了输电线路单相故障识别判据的灵敏度和可靠性。
The invention discloses a method for identifying the nature of a single-phase fault of a transmission line based on natural frequency, which is specifically implemented in accordance with the following steps: 1) After the single-phase fault of the transmission line trips, the fault phase current i(t) is collected and subjected to signal conditioning steps such as high-pass filtering Then Prony analysis is carried out, and the natural frequency main frequency f 1 (k) of the transient component is extracted from the Prony analysis results; 2) The main frequency frequency f 1 (k) obtained in step 1) and the power system frequency f 0 (k) for comparison, construct a reasonable criterion and then according to the criterion, that is, f 1 (k)>K re ·f 0 (k); 3) According to the criterion constructed in step 2), the single-phase fault nature of the transmission line identify. The fault-free identification method of the present invention not only solves the problem that the existing transmission line single-phase fault identification method is easily affected by arc model, fault time, line length, load current, transition resistance and compensation degree factors, but also solves the problem that the existing fixed time limit The problem that the recloser of the recloser overlaps with the instantaneous fault without arc extinguishing further improves the sensitivity and reliability of the single-phase fault identification criterion of the transmission line.
Description
技术领域technical field
本发明属于电力系统输电线路继电保护技术领域，涉及一种输电线路单相智能重合闸故障性质判别方法，具体涉及一种基于固有频率的输电线路单相故障性质识别方法。The invention belongs to the technical field of relay protection of power system transmission lines, and relates to a method for identifying the nature of a single-phase intelligent reclosing fault of a transmission line, and in particular to a method for identifying the nature of a single-phase fault of a transmission line based on a natural frequency.
背景技术Background technique
众所周知，重合闸技术是国内外电力系统广泛采用的一种提高输电线路供电可靠性的有效措施，但现有固定重合时限的重合闸技术存在盲目重合于未熄弧故障和永久故障引发的二次短路冲击的危险。鉴于智能电网高度供电可靠性的要求，提高输电线路的故障自愈能力具有重要的工程价值，其中对具有故障性质识别功能和自适应重合时间的智能重合闸的研究尤为重要。As we all know, reclosing technology is an effective measure widely used in power systems at home and abroad to improve the reliability of power supply of transmission lines. Risk of short circuit shock. In view of the high power supply reliability requirements of the smart grid, it is of great engineering value to improve the fault self-healing ability of transmission lines, among which the research on intelligent reclosing with fault nature identification function and adaptive reclosing time is particularly important.
目前，现有智能重合闸的故障性质判别方法可分为基于故障电弧阶段电气量和恢复电压阶段电气量特征两类。电弧阶段方法主要是利用电弧电压的高次谐波特征实现瞬时故障和永久故障的识别，但由于存在难以建立精确电弧模型和微弱信号测量精度低的问题，使利用电弧阶段电气量特征的判据受到了限制，且所判别为瞬时性的故障在重合前电弧是否熄灭仍存在不确定因素。恢复电压阶段的判别方法有利用端电压量和利用电流量两类。利用电压量的故障识别主要根据断开相电压的幅值相位特征及谐波的成分；利用电流量的故障识别主要有断开相电流、并联电抗器电流和小电抗器电流的幅值、频率及拍频特性等判据。而带并补电抗器的长距离特/超高压长距离输电线路为了减小单相接地故障电弧电流，引入中性点小电抗器实现对相间电容耦合电流的近似全补偿，利用故障点电流特征实现故障性质判别存在困难，而且高补偿度并联电抗器极大的消弱了健全相的耦合作用，同时导致瞬时故障熄弧后的低频自振分量频率十分接近工频分量，使得利用拍频特征的判别方法难以有效应用。At present, the existing methods for identifying the nature of faults in intelligent reclosing can be divided into two types based on the characteristics of the electric quantity in the fault arc stage and the electric quantity in the recovery voltage stage. The arc stage method mainly uses the high-order harmonic characteristics of the arc voltage to realize the identification of instantaneous faults and permanent faults. However, due to the difficulty in establishing an accurate arc model and the low measurement accuracy of weak signals, the criterion for using the electric quantity characteristics of the arc stage There are still uncertain factors in whether the arc is extinguished before the reclosing of the fault judged as transient. There are two types of methods for judging the recovery voltage stage: using terminal voltage and using current. The fault identification using the voltage quantity is mainly based on the amplitude phase characteristics of the disconnected phase voltage and the harmonic components; the fault identification using the current quantity mainly includes the amplitude and frequency of the disconnected phase current, shunt reactor current and small reactor current And beat frequency characteristics and other criteria. In order to reduce the single-phase ground fault arc current of the long-distance ultra-high voltage long-distance transmission line with parallel supplementary reactors, a small reactor at the neutral point is introduced to realize the approximate full compensation of the capacitive coupling current between phases, and the current characteristics of the fault point are used It is difficult to discriminate the nature of the fault, and the high-compensation shunt reactor greatly weakens the coupling effect of the sound phase, and at the same time causes the frequency of the low-frequency natural vibration component after the instantaneous fault arc to be very close to the power frequency component, making the use of beat frequency characteristics It is difficult to effectively apply the discriminant method.
发明内容Contents of the invention
本发明的目的在于提供一种基于固有频率的输电线路单相故障性质识别方法，进一步提高了输电线路单相故障识别判据的灵敏度和可靠性。The object of the present invention is to provide a method for identifying the nature of a single-phase fault of a transmission line based on a natural frequency, which further improves the sensitivity and reliability of the identification criterion for a single-phase fault of a transmission line.
本发明所采用的技术方案是，基于固有频率的输电线路单相故障性质识别方法，具体按照以下步骤实施：The technical scheme adopted in the present invention is a method for identifying the nature of a single-phase fault in a transmission line based on the natural frequency, which is specifically implemented according to the following steps:
步骤1，输电线路单相故障跳闸后，采集故障相电流i(t)，先经信号调理后再对故障相电流i(t)进行PRONY分析，获取故障相电流i(t)主频频率f1(k)；Step 1. After the single-phase fault trip of the transmission line, collect the fault phase current i(t), and then perform PRONY analysis on the fault phase current i(t) after signal conditioning to obtain the main frequency f of the fault phase current i(t) 1 (k);
步骤2，将步骤1中获取的主频频率f1(k)与电力系统工频f0(k)进行比较，构造合理的判据；Step 2, compare the main frequency f 1 (k) obtained in step 1 with the power system power frequency f 0 (k), and construct a reasonable criterion;
步骤3，根据步骤2构造的判据进行输电线路单相故障性质识别。Step 3, according to the criterion constructed in step 2, identify the nature of the single-phase fault of the transmission line.
本发明的特点还在于，The present invention is also characterized in that,
步骤1具体按照以下步骤实施：Step 1 is specifically implemented according to the following steps:
步骤1.1，输电线路单相故障跳闸后采集故障相电流i(t)；Step 1.1, collect the fault phase current i(t) after the single-phase fault trip of the transmission line;
步骤1.2，对步骤1.1中采集到的故障相电流i(t)进行高通滤波等信号处理；Step 1.2, carrying out signal processing such as high-pass filtering to the fault phase current i(t) collected in step 1.1;
步骤1.3，对步骤1.2处理后的故障相电流i(t)进行PRONY分析，在PRONY分析结果中提取出故障相电流i(t)中含有暂态分量的固有频率主频频率f1(k)。Step 1.3, carry out PRONY analysis on the fault phase current i(t) processed in step 1.2, and extract the natural frequency main frequency frequency f 1 (k) containing transient components in the fault phase current i(t) from the PRONY analysis results .
步骤2中构建的判据为：The criterion constructed in step 2 is:
f1(k)>Kre·f0(k)；f 1 (k)>K re f 0 (k);
述判据中，Kre为可靠系数，Kre>1。Among the above criteria, Kre is the reliability coefficient, and Kre >1.
步骤3具体按照以下步骤实施：Step 3 is specifically implemented according to the following steps:
若断路器断开后，若满足步骤2中的判据要求，能够可靠判为输电线路单相故障性质为瞬时性故障；If the circuit breaker is disconnected, if the criterion requirements in step 2 are met, it can be reliably judged that the nature of the single-phase fault of the transmission line is an instantaneous fault;
否则，则判为输电线路单相故障性质为永久性故障。Otherwise, it is judged that the nature of the single-phase fault of the transmission line is a permanent fault.
本发明的有益效果在于，The beneficial effect of the present invention is that,
（1）本发明的基于固有频率的输电线路单相故障性质识别方法在输电线路发生故障时，故障产生的行波将在故障点与线路两端之间来回反射，故障点两侧均可以单独实现对故障性质的识别；对于重要的输电线路，线路两端可同时判别，起到判断后再确认的作用，可有效确保故障性质识别判据的可靠性。(1) The natural frequency-based single-phase fault property identification method of transmission lines of the present invention, when a fault occurs on a transmission line, the traveling wave generated by the fault will reflect back and forth between the fault point and the two ends of the line, and both sides of the fault point can be independently Realize the identification of the nature of the fault; for important transmission lines, both ends of the line can be identified at the same time, playing the role of confirmation after judgment, which can effectively ensure the reliability of the identification criterion of the nature of the fault.
（2）本发明的基于固有频率的输电线路单相故障性质识别方法在故障发生后的暂态分量中存在工频和固有频率成分，固有频率高于工频，且所有固有频率中主频与工频（50Hz）最接近，信号幅值较大且存在时间较长，易于提取；若断路器断开后，固有频率主频分量不存在或者存在时间较小无法提取则输电线路发生永久性故障且已经熄弧。(2) In the natural frequency-based single-phase fault property identification method of the transmission line of the present invention, there are power frequency and natural frequency components in the transient components after the fault occurs, the natural frequency is higher than the power frequency, and the main frequency of all natural frequencies is the same as The power frequency (50Hz) is the closest, the signal amplitude is larger and the existence time is longer, and it is easy to extract; if the main frequency component of the natural frequency does not exist after the circuit breaker is disconnected, or the existence time is too small and cannot be extracted, the transmission line will have a permanent fault And the arc has been extinguished.
（3）本发明的基于固有频率的输电线路单相故障性质识别方法中输电线路故障产生的固有主要频率与故障点位置和线路两端系统的阻抗等输电线路固有参数有关，不受系统运行状态、电弧模型、故障时刻、线路长度、负荷电流、过渡电阻及补偿度等因素的影响。(3) In the natural frequency-based single-phase fault property identification method of transmission lines of the present invention, the natural main frequency generated by transmission line faults is related to the inherent parameters of transmission lines such as the location of the fault point and the impedance of the system at both ends of the line, and is not affected by the operating status of the system. , arc model, fault time, line length, load current, transition resistance and compensation degree and other factors.
（4）本发明的基于固有频率的输电线路单相故障性质识别方法具有良好的适用性，对于现有带并联电抗器和不带并联电抗器的输电线路均可适用。(4) The natural frequency-based single-phase fault property identification method of transmission lines of the present invention has good applicability, and is applicable to existing transmission lines with or without shunt reactors.
附图说明Description of drawings
图1是本发明的基于固有频率的输电线路单相故障性质识别方法中采用的两端带并联电抗器的输电线路微机保护硬件的结构图；Fig. 1 is the structural diagram of the transmission line microcomputer protection hardware with shunt reactors at both ends adopted in the natural frequency-based transmission line single-phase fault property identification method of the present invention;
图2是输电线路发生故障的时序图。Figure 2 is a timing diagram of a transmission line failure.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
当高压输电线路发生故障后，高频分量中的周期性分量是发生故障后行波在输电线路上传播,并在故障点和电源阻抗之间来回反射形成的。在频域上表现为一个特定频率（即固有频率主频）的谐波形式。由线路电感和线路对地电容形成固有频率的振荡回路，由于输电线路的分布参数特性，固有频率应该有无穷多个。随着固有频率的增大，衰减越来越严重，固有频率分量幅值越来越小，只有固有频率的主频幅值最大时，频率与工频最为接近。When a fault occurs on a high-voltage transmission line, the periodic component in the high-frequency component is formed by traveling waves propagating on the transmission line after the fault occurs, and reflecting back and forth between the fault point and the source impedance. In the frequency domain, it is expressed as a harmonic form of a specific frequency (that is, the natural frequency main frequency). The natural frequency oscillation loop is formed by the line inductance and the line-to-ground capacitance. Due to the distributed parameter characteristics of the transmission line, there should be infinitely many natural frequencies. As the natural frequency increases, the attenuation becomes more and more serious, and the amplitude of the natural frequency component becomes smaller and smaller. Only when the main frequency amplitude of the natural frequency is the largest, the frequency is closest to the power frequency.
本发明方法中对两端带并联电抗器的输电线路进行研究，如图1所示，输电线路M、N两侧装有使用本发明判别元件的保护装置，输入量为输电线路电流量，电流由输电线路两侧电流互感器TA1、TA2获取，图1中的虚线框内为本发明所采用的硬件结构图，该硬件包括有数据采集系统、微机主系统及输出输出系统，本发明方法中的判别算法通过编制程序在微机DSP主系统实现。以M侧为例，输电线路电流经电流互感器TA1获取后经高通滤波、采样保持和A/D转换后，送到微机主系统，由相应的算法计算出固有频率；然后依据固有频率计算结果判断线路发生的单相故障是瞬时性故障还是永久性故障。同理，对于双端带并联电抗器线路N侧的保护装置也可以按照前述思路判断线路单相故障性质。对于一端带并联电抗器线路判别结果可由通道传送到对端，由判别算法即判据的判别结果决定两端重合闸动作与否。In the method of the present invention, the transmission line with shunt reactors at both ends is studied, as shown in Figure 1, the protection device using the discriminator of the present invention is installed on both sides of the transmission line M and N, and the input is the current amount of the transmission line, and the current Acquired by the current transformers TA1 and TA2 on both sides of the transmission line, the hardware structure diagram adopted by the present invention is in the dotted line box in Fig. 1, and this hardware includes data acquisition system, microcomputer main system and output output system, in the inventive method The discriminant algorithm is implemented in the main computer DSP system by programming. Taking the M side as an example, the transmission line current is obtained by the current transformer TA1, and then sent to the main computer system after high-pass filtering, sampling and holding and A/D conversion, and the natural frequency is calculated by the corresponding algorithm; then the result is calculated based on the natural frequency Determine whether the single-phase fault on the line is an instantaneous fault or a permanent fault. In the same way, for the protection device on the N side of the double-ended line with shunt reactor, the nature of the single-phase fault of the line can also be judged according to the aforementioned ideas. For a line with a shunt reactor at one end, the discrimination result can be transmitted to the opposite end through the channel, and the judgment result of the judgment algorithm, that is, the criterion, determines whether the reclosing action at both ends is activated or not.
本发明的基于固有频率的输电线路单相故障性质识别方法的原理是利用故障相电流量的频率特性构建故障性质识别判据，具体是故障线路中的电流分量依次经录波、滤波之后，利用Prony算法分析其频率，提取固有频率主要频率分量，通过比较主频与工频的大小建立故障性质识别判据进行故障性质识别。The principle of the natural frequency-based single-phase fault property identification method of the transmission line in the present invention is to use the frequency characteristic of the fault phase current to construct the fault property identification criterion. The Prony algorithm analyzes its frequency, extracts the main frequency components of the natural frequency, and establishes the fault nature identification criterion by comparing the main frequency and the power frequency to identify the fault nature.
本发明的基于固有频率的输电线路单相故障性质识别方法，具体按照以下步骤实施：The method for identifying the nature of a transmission line single-phase fault based on the natural frequency of the present invention is specifically implemented according to the following steps:
步骤1，输电线路单相故障跳闸后，采集故障相电流i(t)，先经信号调理后再对故障相电流i(t)进行Prony分析，获取故障相电流i(t)主频频率f1(k)：Step 1: After the transmission line single-phase fault trips, the fault phase current i(t) is collected, and after signal conditioning, the fault phase current i(t) is subjected to Prony analysis to obtain the main frequency f of the fault phase current i(t) 1 (k):
步骤1.1，输电线路单相故障跳闸后采集故障相电流i(t)；Step 1.1, collect the fault phase current i(t) after the single-phase fault trip of the transmission line;
步骤1.2，对步骤1.1中采集到的故障相电流i(t)进行高通滤波等信号处理，滤除噪声及频率低于50Hz的各频率信号；Step 1.2, perform signal processing such as high-pass filtering on the fault phase current i(t) collected in step 1.1, and filter out noise and various frequency signals with a frequency lower than 50 Hz;
步骤1.3，对步骤1.2处理后的故障相电流i(t)进行Prony分析，在Prony分析结果中提取出故障相电流i(t)中含有的暂态分量的固有频率主频频率f1(k)；这是因为故障相电流i(t)含有的各暂态分量中频率越高幅值小，衰减越严重，只有固有频率主频分量幅值最高，提取最为方便，而且主频频率f1(k)与工频f0(k)最为接近；Step 1.3, Prony analysis is performed on the fault phase current i(t) processed in step 1.2, and the natural frequency main frequency f 1 (k ); this is because the higher the frequency, the smaller the amplitude of the transient components contained in the fault phase current i(t), the more serious the attenuation, only the natural frequency main frequency component has the highest amplitude, the most convenient extraction, and the main frequency f 1 (k) is closest to the power frequency f 0 (k);
步骤2，将步骤1中获取的主频频率f1(k)与电力系统工频f0(k)进行比较，构造合理的判据：Step 2, compare the main frequency f 1 (k) obtained in step 1 with the power system frequency f 0 (k), and construct a reasonable criterion:
在输电线路单相故障跳闸后，故障相电流i(t)分量中存在固有频率高频暂态分量，并且固有频率中主频频率f1(k)会大于电力系统工频f0(k)；After the single-phase fault tripping of the transmission line, there is a natural frequency high-frequency transient component in the component of the fault phase current i(t), and the main frequency f 1 (k) of the natural frequency will be greater than the power system frequency f 0 (k) ;
当断路器断开之后，瞬时性故障（故障未熄弧）还会继续存在固有频率高频分量；When the circuit breaker is disconnected, the transient fault (the fault does not extinguish the arc) will continue to have the high frequency component of the natural frequency;
永久性故障对地可靠放电，故障相电流i(t)分量不存在高频分量只存在工频分量f0(k)；The permanent fault is reliably discharged to the ground, and there is no high-frequency component in the fault phase current i(t) component, only the power frequency component f 0 (k);
具体按照以下判据进行判断：Specifically, judge according to the following criteria:
f1(k)>Kre·f0(k)；f 1 (k)>K re f 0 (k);
在上述判据中，Kre为可靠系数，Kre>1；In the above criteria, K re is the reliability coefficient, K re >1;
步骤3，根据步骤2构造的判据进行输电线路单相故障性质识别：Step 3, according to the criterion constructed in step 2, identify the nature of the transmission line single-phase fault:
断路器断开后，若满足步骤2中的判据要求，能够可靠判为输电线路单相故障性质为瞬时性故障，产生瞬时性故障熄弧的时刻发出重合命令，这样能有效缩短停电时间，瞬时性故障熄弧的时刻的确定能够有效提高重合闸的效率；After the circuit breaker is disconnected, if the criterion requirements in step 2 are met, it can be reliably judged that the single-phase fault of the transmission line is a transient fault, and a reclosing command is issued at the moment when the transient fault arc is extinguished, which can effectively shorten the power outage time. The determination of the moment of instantaneous fault arc extinguishing can effectively improve the efficiency of reclosing;
否则，则判为输电线路单相故障性质为永久性故障或称之为瞬时故障已熄弧，在最大允许非全相运行时间到达前持续判别，此外永久性故障对地可靠放电，电弧熄灭相对较快，当断路器断开之后，故障相不含高频固有分量。Otherwise, it is judged that the nature of the single-phase fault of the transmission line is a permanent fault or an instantaneous fault that has been extinguished, and it will continue to be judged before the maximum allowable non-full-phase operation time is reached. In addition, the permanent fault discharges reliably to the ground, and the arc extinguishing Faster, when the circuit breaker is opened, the fault phase does not contain high-frequency intrinsic components.
图2展示了输电线路故障时序，由图2可以看出：t1时刻输电线路发生故障，t2时刻断路器断开，t3时刻故障熄弧，t4是重合闸时刻。当输电线路故障发生之后，即t>t1时，对故障相暂态电流分量固有频率的主频f1(k)进行持续计算，当判断完成，重合闸装置动作之后，停止计算。当t1<t<t2时，瞬时性故障和永久性故障都含有暂态高频分量；由于永久性故障对地可靠放电，故障相暂态分量中固有频率主频分量持续时间不长。当t>t2时，可以根据判据判断故障性质，若无法提取到固有高频主频分量或主频分量不存在时，可直接判为永久性故障。当上述判据满足动作条件判为瞬时性故障，自适应重合闸装置动作，断路器合闸。反之，则判为永久性故障，自适应重合闸装置闭锁。Figure 2 shows the fault sequence of the transmission line. It can be seen from Figure 2 that the transmission line fails at time t1 , the circuit breaker is disconnected at time t2 , the fault arc is extinguished at time t3 , and the reclosing time is t4 . After the transmission line fault occurs, that is, when t>t 1 , the main frequency f 1 (k) of the natural frequency of the transient current component of the fault phase is continuously calculated. When the judgment is completed and the reclosing device operates, the calculation is stopped. When t 1 <t<t 2 , both transient faults and permanent faults contain transient high-frequency components; due to the reliable discharge of permanent faults to ground, the duration of the main frequency component of the natural frequency in the transient components of the fault phase is not long. When t>t 2 , the nature of the fault can be judged according to the criterion. If the inherent high-frequency main frequency component cannot be extracted or the main frequency component does not exist, it can be directly judged as a permanent fault. When the above criteria meet the action conditions, it is judged as an instantaneous fault, the adaptive reclosing device operates, and the circuit breaker closes. On the contrary, it is judged as a permanent fault, and the adaptive reclosing device is blocked.
本发明的方法是在输电线路内部故障基础上，根据故障产生的电磁波固有频率，分析固有频率特征而提出一种基于固有频率特征的输电线路故障性质识别方法，其中固有频率只与输电线路固有参数有关，所以此方法不受系统外其他因素的影响，与现有利用输电线路电气量特征的判据配合使用可有效提高可靠性。本发明的方法不仅可以作为特高压长线路智能重合闸故障性质识别的有效方法；还可作为现有基于故障相电气量特征判据的有效补充。在微机保护和信号处理技术日益成熟的基础之上，该方法具有良好的应用前景。The method of the present invention is based on the internal fault of the transmission line, according to the natural frequency of the electromagnetic wave generated by the fault, analyzing the natural frequency characteristics and proposing a method for identifying the nature of the transmission line fault based on the natural frequency characteristics, wherein the natural frequency is only related to the natural parameters of the transmission line Therefore, this method is not affected by other factors outside the system, and it can effectively improve the reliability when used in conjunction with the existing criterion using the characteristics of the electrical quantity of the transmission line. The method of the invention can not only be used as an effective method for identifying the fault nature of the intelligent reclosing switch of the UHV long line, but also can be used as an effective supplement to the existing criterion based on the characteristic of the electric quantity of the fault phase. Based on the increasingly mature microcomputer protection and signal processing technology, this method has a good application prospect.
本发明的基于固有频率特征的输电线路故障性质识别方法是基于故障点产生向输电线路两侧传播的一系列暂态高频（即固有频率）分量的主频成分，在断路器断开之后，根据固有频率主频频率f1(k)与工频大小的比较来识别故障性质，固有频率具有只与输电线路参数有关的特点，避免了基于故障相电气量特征识别判据的故障相电气量与多种因素有关及对测量精度要求较高的缺点。The transmission line fault nature identification method based on natural frequency characteristics of the present invention is based on the main frequency components of a series of transient high-frequency (that is, natural frequency) components that propagate to both sides of the transmission line at the fault point. After the circuit breaker is disconnected, Identify the nature of the fault based on the comparison of the natural frequency main frequency f 1 (k) with the power frequency. The natural frequency has the characteristics that it is only related to the parameters of the transmission line, which avoids the fault phase electric quantity based on the identification criterion of the fault phase electric quantity characteristic It is related to many factors and requires high measurement accuracy.
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