Fault location technology for high-voltage overhead lines combined with underground power cables based on travelling wave principle

2011 ◽  
Author(s):  
Ping Chen ◽  
Kuixin Wang
Keyword(s):  
High Voltage ◽  
Fault Location ◽  
Travelling Wave ◽  
Power Cables ◽  
Overhead Lines ◽  
Underground Power Cables

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.

An Online Travelling Wave Fault Location Method for Unearthed-Operated High-Voltage Overhead Line Grids

2018 ◽  
Vol 33 (6) ◽  
pp. 2776-2785 ◽  
Author(s):  
Roberto Benato ◽  
Sebastian Dambone Sessa ◽  
Michele Poli ◽  
Cristiano Quaciari ◽  
Giovanni Rinzo
Keyword(s):  
High Voltage ◽  
Fault Location ◽  
Travelling Wave ◽  
Overhead Line ◽  
Location Method

scholarly journals Fault identification in power cables by using travelling wave-based approach

2021 ◽  
Vol 12 (2) ◽  
pp. 855-865
Author(s):  
M.NagaJyothia, Et. al.
Keyword(s):  
Communication Channel ◽  
Fault Location ◽  
Travelling Waves ◽  
Travelling Wave ◽  
Fault Identification ◽  
Power Cable ◽  
Power Cables ◽  
Underground Cables ◽  
Ground Resistance ◽  
Types Of Faults

Thefaults in the underground cables cause to generatetransients which propagate along the power cable as travelling waves. The velocity of the generated travelling wave and the time taken by a wave to reach the source point from the fault location enables us to calculate the fault distance value.In this paper a double endedtravelling wave based approach is used and a communication channel is designed to calculate the fault distance. A circuit-based model is developed in the EMTP-RV software to find out the fault distance from the source end for all types of faults. Further it is proved that the fault distance is unaffected by the change in ground resistance, various types of faults and the fault inception angle in the proposed method

scholarly journals Performance of Polymer Cementitious Coatings for High-Voltage Electrical Infrastructure

2021 ◽  
Vol 6 (9) ◽  
pp. 125
Author(s):  
Bowen Xu ◽  
Hui Li ◽  
Dan V. Bompa ◽  
Ahmed Y. Elghazouli ◽  
Jiangbo Chen
Keyword(s):  
High Voltage ◽  
Structural Design ◽  
Dielectric Strength ◽  
Embodied Energy ◽  
Power Cables ◽  
Coating Materials ◽  
Good Thermal Stability ◽  
Manufacturing Method ◽  
Strength Tests ◽  
Underground Power Cables

This paper investigates the electrical, thermal and mechanical properties as well as the environmental performance of polymer cementitious composites (PCCs) as sustainable coating materials for underground power cables and as high-voltage insulators. Particular focus is placed on the optimised mix design and the effect of the manufacturing method on the performance of PCCs, incorporating liquid styrene and acrylic (SA) monomers, wollastonite and muscovite. Microstructural investigations, together with results from strength tests, indicate that the manufacturing method is a key performance parameter. Experimental results show that PCC mixes containing 25% SA emulsion, 12.5% wollastonite and no muscovite provide the most favourable dielectric properties from the mixes investigated. The PCC material has a dielectric strength up to 16.5 kV/mm and a dielectric loss factor lower than 0.12. Additional experiments also show that PCC has good thermal stability and thermal conductivity. The mechanical strength tests indicate that PCC specimens possess reliable strengths which are applicable in structural design. Environmental assessments also show that PCCs possess significantly lower embodied energy and embodied carbon than conventional plastic insulating materials.

scholarly journals Online PD detection on high voltage underground power cables by acoustic emission

2012 ◽  
Vol 35 ◽  
pp. 22-30 ◽  
Author(s):  
Pau Casals-Torrens ◽  
A. González-Parada ◽  
R. Bosch-Tous
Keyword(s):  
Acoustic Emission ◽  
High Voltage ◽  
Power Cables ◽  
Underground Power Cables

scholarly journals Development of a Wavelet – ANFIS Based Fault Location and Identification System for Underground Power Cables

2020 ◽  
Vol 9 (11) ◽  
pp. 35-41
Keyword(s):  
Fault Location ◽  
Power Transmission ◽  
Fuzzy Inference ◽  
Percentage Error ◽  
Identification System ◽  
Power Cables ◽  
Inference System ◽  
Underground Cables ◽  
Fuzzy Input ◽  
Underground Power Cables

Transmissionlinesare thebackboneof electricalpower systems and other power utilities as they are used for transmission and distribution of power. Power is distributed to the end-user through either overhead cables or underground cables. In the case of underground cables, their propensity to fail in service increases as they age with time. The increase in failure rates and system crashes on older underground power cables now negatively affect system reliability and involve numerous losses. It is therefore easy to realize that the consequences of this trend need to be managed [3]. Identification of the type of defects and their locations along the length ofthe cablesis vital to minimize the operating costs by reducing lengthy and expensive patrolsto locate the faults, and to speed up repairs and restoration of power in the lines. In this study, a method that combines wavelets and neurofuzzy techniques for faultlocation and identificationare proposed. For this methodology a power transmission line model was developed and different fault locations were simulated in MATLAB/SIMULINK, and, as an input to the training and development of the Adaptive Network Fuzzy Inference System (ANFIS), certain selected features of the wavelet transformed signals were used. Fault index obtained from wavelet transformation are used as input variable for fuzzy input block function. Different membership functions were observed within input block function. As per formulation of rules, for membership function, the output value of the defuzzifier component was decoded to give a crisp value of ANFIS output. ANFIS results were compared with actual values. A comparison of the ANFIS output values and the actual values show that the percentage error was less than 1%. Thus, it can be concluded that the wavelet-ANFIS technique is accurate enough to be used in identifying and locating underground power line faults. Which will help in solving this time taking and tedious problem more efficiently and thereby reducing human effort in finding the type of fault and its location.

scholarly journals A calculation model for determination of impedance of power high voltage single-core cables with polymer insulation

2021 ◽  
pp. 47-51
Author(s):  
G. V. Bezprozvannych ◽  
I. A. Kostiukov
Keyword(s):  
High Voltage ◽  
Proximity Effect ◽  
Surface Effect ◽  
Characteristic Impedance ◽  
Complex Impedance ◽  
Calculation Model ◽  
Power Cables ◽  
Electrical Networks ◽  
Overhead Lines ◽  
Wide Range

Introduction. The wave parameters of power cables with polymer insulation differ significantly from the parameters of overhead lines and power transformers. As a result, there are more and more objects in electrical networks for which the occurrence of complex multi frequency transients, accompanied by dangerous overvoltages, should be expected. Purpose. To develop a computational model of the complex impedance of high-voltage single-core power cables of coaxial design required to determine the frequency dependencies of the active resistance and inductance of the conductive core and metal shield, taking into account the surface effect and proximity effect. Methodology. The method is based on solving a system of linear algebraic Kirchhoff equations (SLAE) for magnetically coupled contours. SLAE can be used to calculate conductors taking into account the skin effect and proximity effect. Practical value. The developed model is the basis for determining the characteristic impedance of high-voltage single-core power cables in a wide range of frequencies required to establish adequate criteria for evaluating the parameters of high-frequency effects critical for cross linked polyethylene insulation.

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