Fault Section Identification of the Power Cables in Urban Distribution Networks by Amplitude Differences Between the Zero-sequence Currents and Those Flowing in Cable Sheaths and Armors

The power supply reliability of the urban distribution networks is being challenged by cable faults. Owing to the complex factors, such as system neutral, fault condition, and DG integration, it is difficult to detect and locate the fault cable. In this paper, the equivalent circuit model of the dis...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2023-07, Vol.14 (4), p.1-1
Main Authors: Peng, Nan, Zhang, Peng, Liang, Rui, Zhang, Zhengyi, Liu, Xinyu, Wang, Hao, Zhao, Yang, Ren, Xiaofeng, Wang, Xiuru
Format: Article
Language:English
Subjects:
Amplitudes
Cable shielding
Cables
Circuit faults
Conductors
Couplings
Distributed generation
Distribution networks
Equivalent circuits
fault identification
Grounding
grounding line current
Integrated circuit modeling
Mathematical analysis
Network topologies
Power cables
Robustness (mathematics)
Sheaths
Simulation models
urban distribution cable
zero-sequence current
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Summary:The power supply reliability of the urban distribution networks is being challenged by cable faults. Owing to the complex factors, such as system neutral, fault condition, and DG integration, it is difficult to detect and locate the fault cable. In this paper, the equivalent circuit model of the distribution cable is firstly created by considering the multiconductor couplings. The mathematical relation of the amplitude differences between zero-sequence currents and those flowing in cable sheaths and armors at the local end of the healthy and fault cables are then derived in theory. Finally, according to the network topology and measurement locations, a novel method for identifying the fault cable section is proposed by using the defined space-measurement matrix. The simulation model of a real urban distribution network is established in PSCAD/EMTDC. The effectiveness and robustness of the proposed method are validated. The results demonstrate that the method is barely affected by the neutral grounding mode, fault initial condition, and distributed generation (DG) penetration level.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2022.3222209