scholarly journals Two-terminal fault detection and location for hybrid transmission circuit

2021 ◽  
Vol 23 (2) ◽  
pp. 639
Author(s):  
Muhd Hafizi Idris ◽  
Mohd Rafi Adzman ◽  
Hazlie Mokhlis ◽  
Mohammad Faridun Naim Tajuddin ◽  
Haziah Hamid ◽  
...  
Keyword(s):  
Fault Detection ◽  
Fault Location ◽  
Detection Algorithm ◽  
Positive Sequence ◽  
Fault Estimation ◽  
Average Error ◽  
Fault Resistance ◽  
Hybrid Transmission ◽  
Check Method ◽  
Location Algorithm

This paper presents the algorithms developed to detect and locate the faults ata hybrid circuit. First, the fault detection algorithm was developed using the comparison of total positive-sequence fault current between pre-fault and fault times to detect the occurrence of a fault. Then, the voltage check method was used to decide whether the fault occurred at overhead line (OHL) or cable section. Finally, the fault location algorithm using the impedance-based method and negative-sequence measurements from both terminals of the circuit were used to estimate the fault point from local terminal. From the tests of various fault conditions including different fault types, fault resistance and fault locations, the proposed method successfully detected all fault cases at around 1 cycle from fault initiation and with correct faulted section identification. Besides that, the fault location algorithm also has very accurate results of fault estimation with average error less than 1 km and 1%.<br /><div> </div>

A New Distance Relaying Method with System Load Condition Considered in a Transmission Line

2005 ◽  
Vol 277-279 ◽  
pp. 686-691
Author(s):  
Hyun Kyung Moon ◽  
Seung Ho Hyun ◽  
Sung J. Lee
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Load Condition ◽  
Fault Current ◽  
Loop Analysis ◽  
Fault Resistance ◽  
Before And After ◽  
Location Algorithm ◽  
Distance Relaying ◽  
Feed Effect

This paper presents a novel fault location algorithm for a distance relay of a transmission line. Under the assumption that the source voltages and impedances of both ends are not changed before and after a fault, the fault current and the voltage of the terminal end are estimated including the loading condition. Then, the fault location expression, independent of the fault resistance, is derived using these voltages and currents through a loop analysis, in the manner that the in-feed effect of the terminal end is eliminated. The suggested algorithm is applied to a typical transmission line to show its effectiveness.

scholarly journals Analysis of Local Measurement-Based Algorithms for Fault Detection in a Multi-Terminal HVDC Grid

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4808 ◽  
Author(s):  
María José Pérez Molina ◽  
Dunixe Marene Larruskain ◽  
Pablo Eguía López ◽  
Agurtzane Etxegarai
Keyword(s):  
Fault Detection ◽  
Fault Location ◽  
Operating Time ◽  
Rate Of Change ◽  
Local Measurement ◽  
Backup Protection ◽  
High Voltage Direct Current ◽  
Fault Resistance ◽  
Operation Speed ◽  
Protection Systems

One of the most important challenges of developing multi-terminal (MT) high voltage direct current (HVDC) grids is the system performance under fault conditions. It must be highlighted that the operating time of the protection system needs to be shorter than a few milliseconds. Due to this restrictive requirement of speed, local measurement based algorithms are mostly used as primary protection since they present an appropriate operation speed. This paper focuses on the analysis of local measurement based algorithms, specifically overcurrent, undervoltage, rate-of-change-of-current, and rate-of-change-of-voltage algorithms. A review of these fault detection algorithms is presented. Furthermore, these algorithms are applied to a multi-terminal grid, where the influence of fault location and fault resistance is assessed. Then, their performances are compared in terms of detection speed and maximum current interrupted by the HVDC circuit breakers. This analysis aims to enhance the protection systems by facilitating the selection of the most suitable algorithm for primary or backup protection systems. In addition, two new fault type identification algorithms based on the rate-of-change-of-voltage and rate-of-change-of-current are proposed and analyzed. The paper finally includes a comparison between the previously reviewed local measurement based algorithms found in the literature and the simulation results of the present work.

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.

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.

Fast Earth Fault Location by Analysing the Character of the Initial Processes

1970 ◽  
Vol 111 (5) ◽  
pp. 55-58
Author(s):  
S. Gudzius ◽  
U. Karaliute ◽  
L. A. Markevicius ◽  
A. Morkvenas ◽  
R. Miliune
Keyword(s):  
Fault Detection ◽  
Fault Location ◽  
Electrical Equipment ◽  
Power Network ◽  
Power Networks ◽  
Network State ◽  
Earth Fault ◽  
State Identification ◽  
The Earth ◽  
Location Algorithm

Nowadays it is thought that distribution power networks have the ability to isolate damaged power network place by making optimal links, to identify the fault character, to recognize the character of transients, to establish the fault cause and estimate the state of electrical equipment. For such an objective, fast identification of the earth fault and its place location is a very important problem which requires reliable solutions. The paper describes the new algorithm of earth fault detection and location which is based on the analysis of the initial processes of the fault and its keystone elements. The earth fault detection and location algorithm has been implemented in distribution network state identification terminals. Ill. 6, bibl. 11 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.111.5.356

scholarly journals Fault Detection of the Power System Based on the Chaotic Neural Network and Wavelet Transform

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Zuoxun Wang ◽  
Liqiang Xu
Keyword(s):  
Neural Network ◽  
Wavelet Transform ◽  
Fault Detection ◽  
Power System ◽  
Fault Location ◽  
Detection Algorithm ◽  
Travelling Wave ◽  
Discrete Wavelet ◽  
Chaotic Neural Network ◽  
Transition Resistance

The safety and stability of the power supply system are affected by some faults that often occur in power system. To solve this problem, a criterion algorithm based on the chaotic neural network (CNN) and a fault detection algorithm based on discrete wavelet transform (DWT) are proposed in this paper. MATLAB/Simulink is used to establish the system model to output fault signals and travelling wave signals. Db4 wavelet decomposes the travelling wave signals into detail signals and approximate signals, and these signals are combined with the two-terminal travelling wave location method to achieve fault location. And the wavelet detail coefficients are extracted to input to the proposed chaotic neural network. The results show that the criterion algorithm can effectively determine whether there are faults in the power system, the fault detection algorithm has the capabilities of locating the system faults accurately, and both algorithms are not affected by fault type, fault location, fault initial angle, and transition resistance.

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.

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