Unsynchronized parameter free fault location scheme for hybrid transmission line

2021 ◽  
Vol 192 ◽  
pp. 106982
Author(s):  
Seyed Mehran Hashemian ◽  
Seyed Nasrollah Hashemian ◽  
Mehdi Gholipour
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Hybrid Transmission

scholarly journals Comparison of Artificial Intelligence Methods for Fault Classification of the 115-kV Hybrid Transmission System

2020 ◽  
Vol 10 (11) ◽  
pp. 3967 ◽  
Author(s):  
Jittiphong Klomjit ◽  
Atthapol Ngaopitakkul
Keyword(s):  
Artificial Intelligence ◽  
Neural Networks ◽  
Transmission Line ◽  
Fault Location ◽  
Back Propagation ◽  
Fault Classification ◽  
Support Vector ◽  
Discrete Wavelet ◽  
Mother Wavelet ◽  
Hybrid Transmission

This research proposes a comparison study on different artificial intelligence (AI) methods for classifying faults in hybrid transmission line systems. The 115-kV hybrid transmission line in the Provincial Electricity Authority (PEA-Thailand) system, which is a single circuit single conductor transmission line, is studied. Fault signals in the transmission line were generated by the EMTP/ATPDraw software. Various factors such as fault location, type, and angle were considered. Then, fault signals were analyzed by coefficient details on the first scale of the discrete wavelet transform. Daubechies mother wavelet from MATLAB software was used to decompose the fault signal. The coefficient value of the mother wavelet behaved depending on the position, inception of fault angle, and fault type. AI methods including probabilistic neural networks (PNNs), back-propagation neural networks (BPNNs), and support vector machine (SVM) were used to identify faults. AI input used the maximum first peak coefficients of phase ABC and zero sequence. The results obtained from the study were found to be satisfactory with all AI methodologies having an average accuracy of more than 98% in the case study. However, the SVM technique can provide more accurate results than the PNN and BPNN techniques with less computation burden. Thus, it is suitable for being applied to actual protection systems.

Study on a Method of Single – Phase Grounding Fault Locating for Hybrid Transmission Line

2012 ◽  
Vol 614-615 ◽  
pp. 1075-1080
Author(s):  
Li Gao ◽  
Hong Chun Shu
Keyword(s):  
Transmission Line ◽  
Network Topology ◽  
Fault Location ◽  
Single Phase ◽  
Distribution Network ◽  
Discontinuity Point ◽  
Wave Impedance ◽  
Matrix Algorithm ◽  
The Matrix ◽  
Hybrid Transmission

It is difficult to achieve precise fault location for hybrid transmission line of distribution network, because it has wave impedance discontinuity point. Section location is the premises of precise location. On the basis of others’ research results, the matrix algorithm of distribution network single-phase ground fault section location is improved in the paper. It makes the sparse degree of matrix is higher, computation is less. An algorithm of recovery the network topology only based on the fault description matrix is suggested when the visualization data of a line network topology is loss or the operating is in the non-visual condition. The method is applied to revise fault description matrix, so that the matrix algorithm has some fault-tolerance. The applicability and validity of the improved algorithm was verified by an illustration. The method realizes the fault section location, and the subsequent accurate fault location is presented in this paper.

Fault location for overhead and cable hybrid transmission line in VSC-HVDC system

2021 ◽  
Vol 195 ◽  
pp. 107122
Author(s):  
Yanxia Zhang ◽  
Ting Li ◽  
Jian Wang ◽  
Haidong Wang ◽  
Yuqing Chang
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Hvdc System ◽  
Hybrid Transmission

scholarly journals Impact of optical current transformer on protection scheme of hybrid transmission line

2021 ◽  
Vol 24 (1) ◽  
pp. 1
Author(s):  
Zainal Arifin ◽  
Muhammad Zulham ◽  
Eko Prasetyo
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Power Transmission ◽  
Current Transformer ◽  
System Stability ◽  
Protection Scheme ◽  
Circulating Current ◽  
Instrument Transformers ◽  
Hybrid Transmission ◽  
The Impact

Continuity of power transmission is important to ensure the reliability of the electricity supply. As most system faults are temporary, the auto reclose (AR) scheme has been used extensively to minimise the outage duration, prevent widespread outages, thus increase system stability. Meanwhile, the hybrid transmission line (HTL) combining overhead line (OHL) and high voltage cable has been introduced to provide an inexpensive solution for an urban power grid. Protecting HTL with a conventional protection system would forbid the operation of the AR scheme due to difficulty to ensure whether the fault occurred on the OHL or cable section. Therefore, the circulating current protection (CCP) scheme is used in the cable section to ensure the fault location and block the AR scheme. The technology of an optical current transformer (OCT) as one of the non-conventional instrument transformers (NCIT) has emerged to provide a solution to drawbacks on the conventional current transformer (CCT). Consequently, this paper investigated the impact of using OCT over the CCT for CCP of the HTL. The result shows that OCT could be used for CCP on much longer cable sections thus increase its reliability as the AR scheme can be used on longer or multiple cable section.

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