Two-Sheath Loop Short Circuit Defects Detection in High-Voltage Cable Systems Using Sheath Current Phasors

Weihua Yuan, Jing Tu, Yongheng Ai, Zhanran Xia, Ruoxin Song, Jianfeng He, Xinyun Gao, Minghong Jiang, Bin Yang, Bo Li () and Hang Wang ()
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Weihua Yuan: Hubei Jiji Electric Power Group Company Ltd., Wuhan Economic and Technological Development District, Wuhan 430000, China
Jing Tu: State Grid Wuhan Electric Power Supply Company, Wuhan 430013, China
Yongheng Ai: State Grid Wuhan Electric Power Supply Company, Wuhan 430013, China
Zhanran Xia: Hubei Jiji Electric Power Group Company Ltd., Wuhan Economic and Technological Development District, Wuhan 430000, China
Ruoxin Song: Hubei Jiji Electric Power Group Company Ltd., Wuhan Economic and Technological Development District, Wuhan 430000, China
Jianfeng He: State Grid Wuhan Electric Power Supply Company, Wuhan 430013, China
Xinyun Gao: Hubei Jiji Electric Power Group Company Ltd., Wuhan Economic and Technological Development District, Wuhan 430000, China
Minghong Jiang: Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China
Bin Yang: Hubei Jiji Electric Power Group Company Ltd., Wuhan Economic and Technological Development District, Wuhan 430000, China
Bo Li: Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China
Hang Wang: Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China

Energies, 2025, vol. 18, issue 18, 1-19

Abstract: The joint is the weak point of HV (high voltage) cable insulation systems; creep discharge between insulation layers of the cable joint, due to moisture intrusion, is one of the main defects leading to single-phase grounding. Carbonization on the insulation interface after creep discharge would lead to a short-circuit defect in the sheath loops and result in abnormal sheath current. In this study, a novel diagnostic criterion using the phasor difference of sheath currents at both ends of the same circuit is proposed. The coupling effect between the sheath and the conductor under defect conditions is considered, and the original lumped parameter model of the cable circuit is optimized. The cable parameters are further corrected using a genetic algorithm. The diagnostic criterion comprehensively accounts for the adverse effects of unequal cable segment lengths, load current fluctuations, grounding impedance, and phase voltage variations. When the phase angle fluctuation of the phasor difference is within 10° and the defect impedance is below 100 Ω, the defective joint can be accurately diagnosed by this method. The conclusion has been validated through PSCAD simulations, with a diagnostic accuracy above 97%. Even under 20 dB noise interference, the error increase remains within 2%.

Keywords: cable joint; cross-bonding; sheath current; phasor difference; defect diagnosis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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