Intelligence Scheme for Fault Location in a Combined Overhead Transmission Line & Underground Cable

2018 ◽  
Vol 19 (5) ◽  
Author(s):  
Papia Ray ◽  
Sabha Raj Arya ◽  
Debani Prasad Mishra
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Fault Analysis ◽  
Impedance Method ◽  
Hybrid Schemes ◽  
Overhead Transmission Line ◽  
Fault Resistance ◽  
Underground Cable ◽  
Intelligent Technique ◽  
Artificial Neural Network Ann

Abstract This paper focuses on comparison of fault position schemes for a long transmission line joint with underground cable. To carry out fault location, two hybrid schemes were implemented. One is the impedance method based on modal transformation (MT) and the other one is the intelligent technique based on artificial neural network (ANN). In this paper one cycle of post fault current and voltage signals were collected initially from the transmission line ends for fault analysis purpose. The first method to analyze the fault position comprises of MT technique in which initially pre-processing of the data is done by Clarke’s Transformation (CT) and Discrete Fourier Transform (DFT). CT decouples the signal and DFT extracts the phasors. Thereafter the fault location is calculated by Power System distributed line modal and MT concept. The second method focuses on estimation of fault distance by ANN with Wavelet Transform (WT) in which WT is used to extract six statistical features in order to pre-process the raw faulted data. These features are then given to ANN for finding fault position. The enactment of the suggested scheme is verified by testing it under different type of fault position, such as variation of fault resistance, inception angle and type. After extensive simulation, it was found that intelligent scheme i.e ANN-WT schemes are capable of locating the fault more accurately and less sensitive to parameter variation than the impedance method i.e MT-CT-DFT.

scholarly journals Fault location technique using GA-ANFIS for UHV line

2014 ◽  
Vol 63 (2) ◽  
pp. 247-262 ◽  
Author(s):  
G. Banu ◽  
S. Suja
Keyword(s):  
Neural Network ◽  
Transmission Line ◽  
Fault Location ◽  
Fuzzy Neural Network ◽  
Overhead Transmission Line ◽  
Fault Resistance ◽  
Performance Variation ◽  
Learning Capabilities ◽  
Fuzzy Neural ◽  
Logic System

Abstract This paper presents an improved approach for locating and identifying faults for UHV overhead Transmission line by using GA-ANFIS. The proposed method uses one end data to identify the fault location. The ANFIS can be viewed either as a Fuzzy system, neural network or fuzzy neural network FNN. The integration with neural technology enhances fuzzy logic system on learning capabilities are proposed to analyze the UHV system under different fault conditions. The performance variation of two controllers in finding fault location is analyzed. This paper analyses various faults under different conditions in an UHV using Matlab/simulink. The proposed method is evaluated under different fault conditions such as fault inception angle, fault resistance and fault distance. Simulation results confirm that the proposed method can be used as an efficient for accurate fault location on the transmission line.

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 A Fast Protection Scheme for TCSC Compensated Transmission Line Using Wavelet-Alienation-Neural Technique

2021 ◽  
Author(s):  
Bhuvnesh Rathore ◽  
Amit Gangwar ◽  
Om Prakash Mahela ◽  
baseem khan ◽  
Sanjeevikumar *Padmanaban
Keyword(s):  
Cycle Time ◽  
Power Flow ◽  
Fault Location ◽  
Fault Current ◽  
Protection Scheme ◽  
Fault Resistance ◽  
Security Algorithm ◽  
Artificial Neural Network Ann ◽  
Thyristor Controlled Series Compensator ◽  
Frequency Power

This paper proposes a security algorithm based on thewavelet-alienation-neural technique for detecting, classifying, and locating faults on Thyristor-Controlled Series compensator (TCSC) compensated lines. A fault index has been calculated using wavelet transform and alienation coefficients with post-fault current signals measured/ sampled for quarter cycle time at both near and far end buses for fault detection and classification. The location of the fault is predicted using an Artificial Neural Network (ANN) after the fault has been diagnosed. Approximate coefficients (quarter cycle time) of both voltage and current signals, from both buses, were provided as input to ANN. Various case studies, such as variations in TCSC position, fault location, sampling frequency, power flow path, incipient angle of fault, TCSC control strategy, fault resistance, and load switching conditions, have verified the robustness of the proposed safety system.

scholarly journals The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3293 ◽  
Author(s):  
Susana Martín Arroyo ◽  
Miguel García-Gracia ◽  
Antonio Montañés
Keyword(s):  
Wavelet Transform ◽  
Transmission Line ◽  
Fault Location ◽  
Harmonic Distortion ◽  
Accurate Method ◽  
Transient Signal ◽  
Detection Scheme ◽  
Fault Resistance ◽  
The Difference ◽  
Sine Signal

In this work, a new and accurate method based on the wavelet transform is proposed for fault location in transmission-line systems. The proposed wavelet method consists of the analysis of the transient signal measured at a single end of the transmission line. Aerial current modes are used, and zero modes are included in the fault-detection scheme for low fault-inception angles. The fault distance is evaluated using the wavelet modulus maxima technique and a method based on the response to a half-sine voltage is proposed to overcome drawbacks arising from the limited sampling frequency and low fault-inception angle. The fault distance is calculated using the difference between the time when a 100 kHz half-sine signal is sent and the time when the derivative signal is received. The proposed algorithm is tested considering harmonic distortion and varying fault resistance, ground resistivity, location and inception angle. The high accuracy of the proposed algorithm is obtained even for faults close to the bus and low inception angles.

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

2014 ◽  
Vol 1030-1032 ◽  
pp. 1360-1365
Author(s):  
Yun Hong Dai ◽  
Shi Bin Liang ◽  
Ming Yao Hu ◽  
Ying Na Li ◽  
Zhen Gang Zhao ◽  
...  
Keyword(s):  
Fault Detection ◽  
Transmission Line ◽  
Fault Location ◽  
Single Phase ◽  
Small Current ◽  
Location Method ◽  
Overhead Transmission Line ◽  
Advantages And Disadvantages ◽  
Supply And Distribution ◽  
Space Truss

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.

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.

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