A hybrid fault location method for overhead lines combined with underground cables using DWT and SVM

2012 ◽  
Author(s):  
H. Livani ◽  
C. Y. Evrenosoglu
Keyword(s):  
Fault Location ◽  
Underground Cables ◽  
Location Method ◽  
Overhead Lines

scholarly journals High Impedance Fault Detection and Location in Combined Overhead Line and Underground Cable Distribution Networks Equipped with Data Loggers

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2331 ◽  
Author(s):  
Saeid Khavari ◽  
Rahman Dashti ◽  
Hamid Reza Shaker ◽  
Athila Santos
Keyword(s):  
Fault Detection ◽  
Power Distribution ◽  
Fault Location ◽  
Distribution Networks ◽  
Discrete Wavelet ◽  
Underground Cables ◽  
Overhead Lines ◽  
High Impedance ◽  
Data Loggers ◽  
High Impedance Fault

Power distribution networks are vulnerable to different faults, which compromise the grid performance and need to be managed effectively. Automatic and accurate fault detection and location are key components of effective fault management. This paper proposes a new framework for fault detection and location for smart distribution networks that are equipped with data loggers. The framework supports networks with mixed overhead lines and underground cables. The proposed framework consists of area detection, faulty section identification, and high impedance fault location. Firstly, the faulty zone and section are detected based on the operation of over-current relays and digital fault recorders. Then, by comparing the recorded traveling times at both ends of lines, which are related to the protection zone, the faulty line is identified. In the last step, the location of the fault is estimated based on discrete wavelet transform. The proposed method is tested on a 20 kV 13 node network, which is composed of overhead lines and underground cables. The method is tested in both balanced and unbalanced configurations. The obtained results confirm the advantages of the proposed method compared with the current state-of-the art.

scholarly journals Fault Location Method for Two-Terminal Untransposed Overhead Lines in Distribution Networks Measured by μMPMU

2021 ◽  
Vol 256 ◽  
pp. 01023
Author(s):  
Tao Wen ◽  
Fangxu Zhang ◽  
Chengbin Wang
Keyword(s):  
Large Scale ◽  
Fault Location ◽  
Rapid Development ◽  
Distribution Networks ◽  
Location Method ◽  
Overhead Lines ◽  
Average Value ◽  
Frequency Components ◽  
Location Methods ◽  
Data Windows

With the rapid development of distribution networks, two-terminal overhead lines have been used on a large scale for higher power supply reliability, thus the fault location has attracted much attention. Accurate fault location is helpful to shorten the outage time and improve the economy of operation greatly. However, since insufficient standardization of equipment selection and poor management, line parameters are usually inaccurate or even unknown, mature fault location methods based on impedance can’t be applied anymore. Also, the asymmetry caused by non-transposition in distribution networks affects the accuracy of fault location. This paper proposes a fault location method for two-terminal untransposed overhead lines without requiring line parameters. Firstly, this paper considers parameter asymmetry, and the mutual impedances between the three phases are set as different values. Secondly, the location equations rely on three-phase networks, then the self-impedance and mutual impedances are regarded as unknowns and solved directly. Finally, this method takes the average value of fundamental frequency components from different data windows, which reduces error and improves accuracy. The simulation results show that the fault location method has high accuracy, and can effectively overcome the influence of unknown line parameters and non-transposition.

Travelling Wave-Based Fault Location Scheme for Aged Underground Cable Combined with Overhead Line

2005 ◽  
Vol 2 (2) ◽  
Author(s):  
Mahmoud I. Gilany ◽  
El Sayed M. Tag Eldin ◽  
Mohamed Mamdouh Abdel Aziz ◽  
Doaa K. Ibrahim
Keyword(s):  
Fault Location ◽  
Travelling Waves ◽  
Travelling Wave ◽  
Transmission Systems ◽  
Singularity Detection ◽  
Underground Cables ◽  
Overhead Lines ◽  
Underground Cable ◽  
On Line ◽  
Underground Power Cables

This paper presents a novel wavelet-based travelling wave fault location algorithm for aged underground cables in transmission systems. Such transmission systems consist of overhead lines combined with underground power cables. Applying the singularity detection feature of wavelets as a powerful signal processing tool, the first and second initial arrival of the voltage travelling waves at the first end of the overhead as well as at the terminal end of the aged cable line can be identified reliably without the need for detection the sign of these waves. In this paper modal signals, rather than the phase signals, are the inputs to the relay.The proposed algorithm is capable of eliminating the effect of the change in the propagation velocity of the travelling waves over the age of the cable. It can be used on-line following the operation of digital relays or off-line using the data stored in the digital transient recording apparatus. Extensive simulation studies carried out using ATP/EMTP show that the proposed algorithm provides an accepted degree of accuracy in fault location under different fault conditions.

A Reactance-Based Fault Location Method for Overhead Lines of AC Electrified Railway

2020 ◽  
Vol 35 (5) ◽  
pp. 2558-2560 ◽  
Author(s):  
Zhengqing Han ◽  
Shuai Li ◽  
Shuping Liu ◽  
Shibin Gao
Keyword(s):  
Fault Location ◽  
Location Method ◽  
Overhead Lines ◽  
Electrified Railway

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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