Fault Location for Transmission Lines with Voltage and Current Measurements at One Bus

2014 ◽  
Vol 15 (5) ◽  
pp. 449-456
Author(s):  
Wanjing Xiu ◽  
Yuan Liao
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Fault Location ◽  
Positive Sequence ◽  
Distributed Parameter ◽  
Impedance Matrix ◽  
Simulation Studies ◽  
Location Method ◽  
Fault Resistance ◽  
Fault Type

Abstract This paper presents a novel fault location method for transmission lines. The proposed method extends an existing method to locate faults by employing voltage and current measurements at one bus, which can be the bus of the faulted line or be far away from the faulted line. The method is applicable if a loop exists that encloses the faulted line, and the bus, of which the voltage is used, and the branch, of which the current is used. The during-fault positive-sequence bus impedance matrix is derived. Then superimposed voltages and currents due to the fault are expressed as a function of fault location and related transfer and driving point impedances. Consequently, the fault location can be evaluated using the obtained measurements. The distributed parameter line model is adopted to consider the shunt capacitances of the line. The proposed method is independent of fault resistance and fault type. Simulation studies have been carried out based on a 27-bus power system, and promising results have been achieved.

Fault Location for Parallel Transmission Lines with Limited Voltage and Current Measurements

2013 ◽  
Vol 14 (3) ◽  
pp. 265-274
Author(s):  
Wanjing Xiu ◽  
Yuan Liao
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Fault Location ◽  
Optimal Estimation ◽  
Positive Sequence ◽  
Distributed Parameter ◽  
Simulation Studies ◽  
Parallel Transmission ◽  
Location Algorithm ◽  
Location Estimate

Abstract This article presents a novel fault location algorithm for parallel transmission lines for scenarios where only limited synchronized voltage and current measurements are available. Existing methods usually request measurements at the faulted line to be available. However, this may not always be the case due to the limited number of recording devices placed in a power system. The proposed method makes the most of available measurements and does not require the measurements to be captured from the faulted line. The pre-fault and during-fault bus impedance matrices for the positive-sequence network are derived. Synchronized bus voltages and branch currents are then expressed as a function of fault location and line parameters. As a result, fault location can be estimated using the obtained measurements. The distributed parameter line model is adopted to fully consider the shunt capacitances of the line. To eliminate the influence of bad measurements, optimal estimation theory is adopted for enhanced accuracy of the fault location estimate. Simulation studies have been carried out based on a 27-bus power system, and encouraging results have been achieved.

scholarly journals A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2066 ◽  
Author(s):  
Shimin Xue ◽  
Junchi Lu ◽  
Chong Liu ◽  
Yabing Sun ◽  
Baibing Liu ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Fault Location ◽  
Control Strategies ◽  
Linear Regression Analysis ◽  
Location Method ◽  
Fault Resistance ◽  
Ac Networks ◽  
Minimum Residual ◽  
Ac Transmission ◽  
Location Methods

Accurate and reliable fault location method for alternating current (AC) transmission lines is essential to the fault recovery. MMC-based converter brings exclusive non-linear characteristics to AC networks under single-phase-to-ground faults, thus influencing the performance of the fault location method. Fault characteristics are related to the control strategies of the converter. However, the existing fault location methods do not take the control strategies into account, with further study being required to solve this problem. The influence of the control strategies to the fault compound sequence network is analyzed in this paper first. Then, a unique boundary condition that the fault voltage and negative-sequence fault current merely meet the direct proportion linear relationship at the fault point, is derived. Based on these, a unary linear regression analysis is performed, and the fault can be located according to the minimum residual sum function principle. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation platform. A large number of simulation results are used to verify the advantages on sampling frequency, fault resistance, and fault distance. More importantly, it provides a higher ranging precision and has extensive applicability.

A New PMU-Based Fault Location Algorithm for Three-Terminal

2013 ◽  
Vol 634-638 ◽  
pp. 3925-3929
Author(s):  
Hong Yu Shen ◽  
Wen Jun Zhang ◽  
Yu Bo Duan ◽  
Jian Jun Xu
Keyword(s):  
Fault Zone ◽  
Transmission Lines ◽  
Fault Location ◽  
Measurement Data ◽  
Data Synchronization ◽  
Distributed Parameter ◽  
Matlab Simulation ◽  
Location Method ◽  
Terminal System ◽  
Location Algorithm

Existing two-terminal fault location method can not be directly applied to the three-terminal transmission lines, this paper presents a new PMU-based fault location algorithm for three-terminal transmission lines. The development of the algorithm takes advantage of PMU measurement data synchronization, uses distributed parameter line model, first of all judging the fault zone after a failure, uses Thevenin's Theorem to merge the non-slip fault, so the three-terminal system is simplified the two-terminal system, Then we can use the two-terminal fault location principle of fault location. Through MATLAB simulation shows the correctness of the algorithm.

Iterative Fault Location Scheme for a Transmission Line Using Synchronized Phasor Measurements

2007 ◽  
Vol 8 (6) ◽  
Author(s):  
Sukumar M Brahma
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Positive Sequence ◽  
Impedance Matrix ◽  
Fault Resistance ◽  
Distributed Parameters ◽  
Phasor Measurements ◽  
Sequence Components ◽  
Simulation Results ◽  
New Iterative Method

This paper describes a new iterative method to locate fault on a single transmission line. The method uses synchronized voltage and current measurements from both line terminals. Using the positive sequence components of the pre-fault and the post-fault phasors, positive sequence source impedances at both terminals are first estimated. Using these source impedances and the line data, the positive sequence bus impedance matrix (Zbus) is formed. Using the properties of Zbus, an iterative algorithm is proposed to locate the fault. This algorithm is tested extensively with data obtained from the EMTP simulation of a long transmission line simulated with distributed parameters in the presence of fault resistance and CT saturation. The simulation results show that the method is very accurate and robust.

A New Single-Ended Fault Location Method Based on Bergeron Model

2012 ◽  
Vol 433-440 ◽  
pp. 2939-2944
Author(s):  
Jian Bo Xin ◽  
Xiang Ning Lin ◽  
Zhi Qian Bo
Keyword(s):  
Transmission Line ◽  
Phase Angle ◽  
Transmission Lines ◽  
Fault Location ◽  
Distributed Parameter ◽  
Phase Voltage ◽  
Location Method ◽  
Distributed Parameter Model ◽  
Location Algorithm ◽  
The Impact

On EHV transmission lines, the impact of distributed capacitance is necessary to be considered in case of fault location. A novel fault location method for single-phase grounded fault of transmission lines is presented based on the distributed parameter model of transmission line. In this method only the voltage and current of single end is used. The residual phase voltage at the fault point should have the same phase angle as the current through fault branch due to the pure resistive characteristics of the fault path impedance. By virtue of searching the minimum phase angle differ-ence between the phase voltage along the transmission line and the fault-component current meas-ured at the side equipped with protection, the fault distance can be located. ATP simulations are used to generate data that are supplied as inputs to the fault location algorithm.

scholarly journals Parameter-Free Fault Location Algorithm for Distribution Network T-Type Transmission Lines

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1534 ◽  
Author(s):  
Wang ◽  
Yun
Keyword(s):  
Distributed Generation ◽  
Transmission Lines ◽  
Fault Location ◽  
Trust Region ◽  
Distribution Networks ◽  
Trust Region Algorithm ◽  
Fault Resistance ◽  
Fault Type ◽  
Location Algorithm ◽  
Data Error

T-type transmission lines have been increasingly used in distribution networks because of the distributed generation integration, but inaccurate line parameters will cause significant error in the results of most existing fault location algorithms for this kind of line. In order to improve the precision, this paper proposes a new fault location algorithm taking line parameters as unknowns. The fault is assumed to occur on each section, and corresponding ranging equations can be built based on one set of three-terminal post-fault synchronous measurements, without using line parameters as inputs. Then, more sets of measurements are utilized to increase the redundancy of equations to resist the influence of data error. The reliable trust-region algorithm is used to solve each group of equations, but only equations of the assumed faulty section with the actual fault point can give the reasonable solutions, accordingly identifying the fault point. The performance of the proposed method is thoroughly investigated with MATLAB/Simulink. The results indicate that the algorithm has a high accuracy and is basically unaffected by fault position, fault resistance, unbalanced fault type, line parameter, and data error.

A Novel Fault-location Method for HVDC Transmission Lines Based on Concentric Relaxation Principle and Wavelet Packet

2020 ◽  
Vol 13 (5) ◽  
pp. 705-716
Author(s):  
Congshan Li ◽  
Ping He ◽  
Feng Wang ◽  
Cunxiang Yang ◽  
Yukun Tao ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Traveling Wave ◽  
Fault Location ◽  
Wave Attenuation ◽  
Wavelet Packet ◽  
Low Frequency ◽  
Evaluation Process ◽  
Location Method ◽  
Hvdc Transmission ◽  
Instantaneous Energy

Background: A novel fault location method of HVDC transmission line based on a concentric relaxation principle is proposed in this paper. Methods: Due to the different position of fault, the instantaneous energy measured from rectifier and inverter are different, and the ratio k between them is the relationship to the fault location d. Through the analysis of amplitude-frequency characteristics, we found that the wave attenuation characteristic of low frequency in the traveling wave is stable, and the amplitude of energy is larger, so we get the instantaneous energy ratio by using the low-frequency data. By using the method of wavelet packet decomposition, the voltage traveling wave signal was decomposed. Results: Finally, calculate the value k. By using the data fitting, the relative function of k and d can be got, that is the fault location function. Conclusion: After an exhaustive evaluation process considering different fault locations, fault resistances, and noise on the unipolar DC transmission system, four-machine two-area AC/DC parallel system, and an actual complex grid, the method presented here showed a very accurate and robust behavior.

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