Single-phase Grounding Fault Location Research Articles

Research on single-phase grounding fault location technology in distribution networks based on impedance method

This article mainly introduces the impedance based single-phase grounding fault location method for distribution networks, including its theoretical basis, algorithm steps, and simulation verification. First, starting from the impedance analysis of the transmission line model, the method of accurately measuring the location of the fault point through phase domain analysis is explained. Next, the process of impedance analysis for single-phase grounding faults was described in detail, that is, how to solve the impedance of the grounding fault points by calculating the voltage and current signals. Then, the specific process of the impedance based grounding fault location algorithm was introduced, including the calculation of equivalent load impedance, the calculation of starting voltage and current, the calculation of grounding current, and the solution of fault point location. Finally, simulation verification was conducted using an IEEE 34 node distribution system example in a MATLAB/Simulink environment, and the results showed that the algorithm has high positioning accuracy, with a maximum error of within 3%.

SOLUTION OF THE SYSTEM OF STATE EQUATIONS OF AN ELECTRICAL NETWORK WITH AN INSULATION DEFECT OR WITH A SINGLE-PHASE GROUND FAULT

A method for solving the system of equations of the state of an electric network with an isolated neutral is proposed, which is created based on the results of measuring the current vectors of the load connection phases and the phase voltages in relation to the ground, which allows to determine the occurrence of insulation defects, including single-phase short circuits to the ground, and also to determine distance to the single-phase ground fault location. In the well-known system of equations of the state of the electrical network, the parameters of the longitudinal resistance of the line phases are additionally taken into account, which consist of the resistance to the shorting point and the resistance beyond the point of shorting the phase to the ground. Due to simplification, the replacement circuit with additional line phase resistances turns into exactly the same circuit as the circuit without taking into account the line phase resistances, due to which the determination of the line resistance to the closing point is performed using a known algorithm. The accuracy of determining the distance to the closing point was evaluated on the mathematical model of the network node. It was established that the main factors affecting accuracy include the ratio of the capacitance values of the line and the network, the distance to the shorting point, as well as the resistance at the shorting point. When using automatic correction, the error in determining the distance to the shorting point with a resistance of 0.1 Ohm does not exceed 0.9% over almost the entire length of the line. Analytical expressions for determining insulation conductivity and the distance to a local insulation defect are proposed. The elements of the algorithm for determining the distance to the location of a local insulation defect and the results of the accuracy assessment of the method for the specific case of a phase-to-ground fault, in which the transient resistance at the fault location is not taken into account, are given. Automatic selection of circuits with low resistance at the point of the circuit is ensured by checking the value of the determined active resistance, as well as checking the voltage of the damaged phase in relation to the ground.

Retracted: Realization of Single-Phase Grounding Fault Location and Recovery Technology in Distribution Network

Retracted: Realization of Single-Phase Grounding Fault Location and Recovery Technology in Distribution Network

Fault Location Method for Three-Core Cable Using Amplitude Ratio of Shield-Grounding Wire Currents

With significant technological advancements in power grids, three-core cables are widely employed for their safety and other benefits. In general, three-core cables in medium-voltage distribution systems are laid underground during operation. As a result, the harsh working environment and complex fault conditions can bring massive challenges to fault location issues. To address the problem, the distinctive cable features are extensively considered in this article, including relatively larger capacitance, cable shield effects, and shield bonding methods. Initially, an equivalent cable model is developed to analyze the relationship between shield-grounding wire currents and the fault point. A single-phase grounding fault location method is then formulated based on the ratio of shield-grounding wire currents at both terminals. In PSCAD/EMTDC, a range of fault scenarios are simulated to verify the proposed method. In comparison to conventional similar approaches, the proposed method exhibits higher accuracy and robustness to fault resistance and diverse fault conditions. Finally, the effectiveness of the proposed method is validated on a real 10 kV distribution network experimental platform under several fault scenarios.

Single-phase Grounding Fault Location Technology Based on Edge Calculation of Fault Components of the Positive-sequence Current

In the one-phase-to-ground fault of the distribution network, due to the difference in the distribution of the positive sequence current constituents of each line, the information contained in the fault path and the non-fault path also has a certain difference. On this basis, the edge of the fault constituent in the positive sequence current is used to locate the one-phase grounding. The method first uses phase current subtraction to multiply the period difference before and after the fault, and then uses the inverse transformation before and after the fault to determine the positive and null sequence constituents of the fault. Symmetrical composition. By analysing the amplitudes of the positive sequence and null sequence currents of the three-phase fault constituents, and according to the corresponding relationship between the amplitudes and the adaptive threshold, the location of the fault section is realized. A specific fault point location criterion and steps are given in this paper, and it is verified by ATP simulation software.

Ground fault location research based on multidimensional scaling and density clustering algorithm

When a single line-to-ground fault occurs in a current distribution network containing distributed power sources, fault location is primarily performed by current-based directional protection. This implies using the switching information at the nodes; however, this does not sufficiently maximize the fault information. To address these issues, a single-phase grounding fault location methodology is planned for distribution networks supported by a combination of three-dimensional scaling (MDS) and density-based spatial clustering of applications with noise (DBSCAN). First, the network description matrix is made to support the network topology. Second, the zero-sequence and negative-sequence currents collected at the terminals square measure pre-processed to obtain two-dimensional fault data feature vectors. Third, the fault feature vectors square measure is subjected to DBSCAN bunch analysis to obtain the fault zones of the distribution network, thus compensating for the disadvantage that DBSCAN cannot efficiently replicate high-dimensional knowledge. The simulation results reveal that the planned methodology is not tormented by fault location, fault resistance, fault angle, or line sort; therefore, the fault location results in a correct square measure and might effectively utilize the fault data.

Third harmonic potential distribution based stator ground fault accurate location method for large generators

The stator single-phase grounding fault location of large generator can provide guidance for rapid maintenance of faults. A third harmonic potential distribution based stator ground fault accurate location method is proposed. The current location methods mainly take coil as location unit and may have location error. However, accurate locate to the slot number is more meaningful for troubleshooting. In addition, the third harmonic potential induced by adjacent slots has larger phase difference, and has more distinct fault characteristics than the fundamental potential. In this paper, the fault location optimization model is constructed based on the analysis of the distribution characteristics of the third harmonic potential. The exhaustive solution of the location model is realized by artificially setting multiple reference points, and finally the reference point closest to the real fault point is obtained. The proposed method can accurately locate the fault slot number. PSCAD simulation verifies that the proposed method is robust against the transition resistance error and has higher accuracy than the existing methods.

Realization of Single-Phase Grounding Fault Location and Recovery Technology in Distribution Network

In order to locate the single-phase-to-ground fault in distribution network, a research method of single-phase-to-ground fault location and recovery technology in distribution network is proposed. According to the characteristics of single-phase-to-ground fault in distribution network, the fault characteristics of zero-sequence current and three-phase current transient records are extracted by generalized S transform of correlation coefficient, and multi-source redundant information is formed. Fuzzy C-means clustering analysis method is used to fuse multiple fault features online location strategy. The simulation results show that the fuzzy clustering based on FCM changes continuously with the accumulation of samples, and the sample center changes with the enrichment of the samples. When the arc suppression coil is grounded with different initial phase angle transition resistance and intermittent fault, the state of each measuring point can be correctly identified, and the accurate energization rate is 97%. The test results show that the system can achieve accurate positioning for all sections.

Single phase grounding fault location algorithm of wind farm collector lines based on multi-terminal information

Single phase grounding fault location algorithm of wind farm collector lines based on multi-terminal information

Single-phase ground fault location method for distribution network based on traveling wave time-frequency characteristics

The traditional traveling wave fault location methods only consider the information about time domain or frequency domain characteristics, so it is difficult to ensure the location accuracy. Through the research of relationship between traveling wave characteristic parameters and frequency, this paper proposes a single-phase grounding fault location method based on traveling wave time-frequency characteristics. Firstly, determine the time during which the traveling wave reaches the busbar by using the quadratic B-spline wavelet analysis modulus maximum detection algorithm with denoising factor.. Then, according to the improved matrix pencil algorithm, extracte the frequency of traveling wave arriving at the bus measuring point, and the corresponding velocity of incident wave is obtained. Finally, the fault distance can be calculated using the location equation of modulus wave velocity difference. The simulation results show that this method proposed in this paper has higher accuracy than the traditional method, and in the terms of different grounding resistance, fault initial angle and fault distance, the error of fault location is smaller.

Single-phase ground fault location technology research and application based on transient recording wave

Fault location is an important part of distribution automation. Aiming at the problem of single-phase grounding fault detection, a fault location system based on transient recording technology is proposed. Compared with the advantages and disadvantages of the traditional single-phase ground fault detection method, the single-phase ground fault location application based on transient recording is proposed. The proposed method is not only theoretically verified in the simulation of the distribution network system, but also applied to the operation of fault location network in the true test field, which verifies the effectiveness of the proposed method.

Research on Single-Phase Grounding Fault Location Technology

In view of the complex structure, large scale and high failure rate of distribution network, as well as many branch lines, large transition resistance, difficult to detect fault signals and difficult to locate accurately., A single-phase grounding fault location method based on single-terminal measurement for distribution network with multi-dominant transmission lines is proposed. This method can solve the problem of reliable monitoring of small current grounding fault through data processing and analysis of measuring units installed at substation equipment and line end, find grounding fault line in time, find fault point, and adopt corresponding treatment measures to block the impact scope of user branch line accident, restore the power supply of non-fault line as soon as possible, and reduce the outage time. Providing further reliable power supply fundamentally solves the problems of reliability and safety of power supply in distribution network. This method only needs to synchronously measure the voltage and current at each end of the line when the parameters of the line are known. The method is simple and the measurement accuracy is high. By locating the single-phase-to-ground fault of multi-dominant power lines, the results show that the method is correct and accurate.

A Research of Single Phase Grounding Fault Location Method Based on the Component of Zero Sequence Current in Distribution Network

A Research of Single Phase Grounding Fault Location Method Based on the Component of Zero Sequence Current in Distribution Network

The Method Analysis of Overhead Transmission Line Single-Phase Grounding Fault Detection and Location

Small current grounding power system is widely used in overhead transmission line in medium voltage distribution network in China. Because of its long lines, branch, space truss structure is complex, low level of automation, It is easily influenced by outside force and the natural environment, and single-phase grounding failure rate is high. It is an important topic to quickly and accurately detect the location of the fault line, and improve the reliability of power supply and distribution system.This paper has carried on the induction and the comparison of various fault detection and location method of overhead transmission line which is currently used in single phase to ground, and analyzed their advantages and disadvantages,given the corresponding conclusions, provided the reference for finding out the reasonable single-phase earth fault location method or improvement.

The Study of Fault Location Method Based on FTU Feeder Automation Technology

With the development of power distribution automation system, feeder automation technology in the small current grounding system single-phase grounding fault location plays an important role. In the neutral arc suppression coil grounding system, because of the compensation effect of arc suppression coil, the system fault feature is not obvious. This paper puts forward a method of RL series branch parallel in arc suppression coil, when system single-phase grounding fault occurs, the series branch switch gets closed and acts on the neutral, that changes the compensation degree of arc suppression coil to zero sequence current in fault line, the change of zero sequence residual current being the biggest in the fault section from neutral to fault point. FTU is used to monitor the change in each fault line for fault regional location.

Transient Component-Based Distribution Network Single-Phase Ground Fault Location

The paper study the single-phase ground Fault Location. Which analysis neutral non-effectively grounded distribution network transient characteristics of single-phase. and verify the HHT method accuracy that through the actual system simulation of single-phase ground fault experiments .It proposed the fault localization criterion which is based on parameter identification. current single-phase ground fault detection and section targeting methods. The paper proposed the implementation which fault information is incomplete. It is help for theoretical study and power engineering..

小电流接地系统单端行波故障定位新算法

单端行波故障定位法以定位速度快，无需巡线，成本低，可以进行多次定位等优点，成为小电流接地系统中单相接地故障定位的有效方法之一。但是其定位精度容易受到多种因素的影响，尤其是受到行波的波速精度的影响，在行波理论的基础上提出一种不受行波波速影响的单端行波故障定位算法，理论推导结果表明，这种算法正确可靠。仿真结果表明，这种定位算法的精度优于传统的单端定位方法。 The single-port wavelet fault location has the merits that location speed is fast, it is not need inspect lines, low cost and may locate many times, so it is one of the effective methods of single-phase grounding fault location of small current grounding system. But its location precision is influenced by many factors, especially the speed precision of the wavelet. On the basis of wavelet theory, it proposes a new arithmetic of single-port wavelet fault location for small current grounding system which not influenced by the speed of wavelet. The result shows that the arithmetic is correct and the simulation result shows that the precision of this arithmetic is better than the traditional single-port wavelet fault location method.