Automatic fault location and isolation system for the electric traction overhead lines

2004 ◽  
Author(s):  
K.K. Agarwal
Keyword(s):  
Fault Location ◽  
Isolation System ◽  
Overhead Lines ◽  
Electric Traction

scholarly journals Detection and Location of Earth Fault in MV Feeders Using Screen Earthing Current Measurements

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1293 ◽  
Author(s):  
Krzysztof Lowczowski ◽  
Jozef Lorenc ◽  
Jozef Zawodniak ◽  
Grzegorz Dombek
Keyword(s):  
Fault Location ◽  
Overhead Lines ◽  
Earth Fault ◽  
Ground Fault ◽  
Detection And Identification ◽  
Zero Sequence ◽  
Network Experiment ◽  
System Configurations ◽  
Zero Sequence Voltage ◽  
Core Current

The paper analyzes the utilization of cable screen currents for earth fault identification and location. Attention is paid on cable and mixed feeders—cable and overhead lines. The principle of operation is based on utilization of 3 criterion values: Ratio of cable screen earthing current and zero sequence cable core current—RF110/15, phase shift between cable screen earthing current and zero sequence cable core current—α and cable screen admittance defined as a ratio of cable screen earthing current and zero sequence voltage—Y0cs. Earth fault location is possible thanks to discovered relation between RF110/15 and α, whereas Y0cs allows for reliable detection of earth faults. Detection and identification are very important because it allows to increase the reliability of supply—reduce downtime and number of consumers affected by the fault. The article presents a phase to ground fault current flow for different power system configurations. At the end solution, which improves location capabilities is proposed. The solution is analyzed in PSCAD software and verified by network experiment.

Study on Fault Location Technology of the OPGW Transmission Line

2014 ◽  
Vol 1044-1045 ◽  
pp. 951-954
Author(s):  
Xiao Tang Wang ◽  
Long Zhang ◽  
Yao Fei Wang ◽  
Wei Chen Song ◽  
Hong Jie Li
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Wave Pattern ◽  
High Voltage Transmission Line ◽  
Overhead Lines ◽  
Advantages And Disadvantages ◽  
Three Phase ◽  
Traveling Wave Method ◽  
Effective Transmission ◽  
Good Agreement

High voltage transmission line is the main channel of transmitting electricity, and the operation reliability is closely related to power effective transmission. In this paper, by analyzing advantages and disadvantages of traveling wave method, transmission line fault location technology based on the OPGW cable was proposed. Basic principle and advantages of this fault location technology were introduced. Three-phase overhead lines fault model was constructed based on PSCAD. Through simulations under different fault types in different fault points, the transient process of the fault phase voltage waveform was analyzed in detail and the fault point was located using the wave pattern features. By comparison, the simulation results and the actual location of fault point were in good agreement, which proved the feasibility of this fault location method.

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.

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