Breakdown failure analysis of 220 kV cable joint with large expanding rate under closing overvoltage

Liao, Yanqun; Bao, Shuzhen; Xie, Yue; Zhao, Yifeng; Wang, Pengyu; Liu, Gang; Hui, Baojun; Yang, Xu

doi:10.1016/j.engfailanal.2020.105086

Cited by 15 publications

(6 citation statements)

References 20 publications

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“…dθ j dx x=L j = dθ c dy y=o (9) dθ c dy (y=∞) = 0 (10) Combined with the boundary conditions, the second-order differential equation shown in (6) is solved, and the conductor temperature distribution of the cable joint and adjacent cable is finally obtained as the following expression.…”

Section: Review Of Traditional Electrothermal Analytic Methods For Ca...mentioning

confidence: 99%

“…While, in the case of high load operation, although the calculated cable temperature is still within the safe operating range, the insulation temperature of cable joints may be higher than the maximum permissible temperature. Overheated operation of cable joints may lead to deterioration of insulation materials, causing partial discharge, breakdown and explosion, fire, and other serious power accidents [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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An Improved Analytical Thermal Rating Method for Cable Joints

He,

Xie,

Wang

et al. 2024

Energies

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To improve the utilization rate of cable lines while retaining sufficient security, the accurate thermal assessment of cable is significant for cable operation condition evaluation. The thermal rating for a cable joint, which is regarded as a hot spot of cable lines, is not covered by the scope of IEC 60287. While the existing publications for cable joint thermal evaluation also have some limitations. In this paper, the quasi-three-dimensional thermal model of the cable joint was established and the iterative solution method for the model is presented. Based on the model, an improved thermal rating method for the cable joint was proposed, which was implemented with monitored surface temperature and load data. The improved method was verified by the finite element method and the results showed an error of less than 5%. The superiority of the improved method was conducted by the comparison between the previously published method and the improved method. The improved method showed a better accuracy than the previously published method. The proposed method in this paper can be complementary to the IEC method, and is easy to use for the operating evaluation of cable joints in the field with the on-line condition monitoring technology.

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Section: Review Of Traditional Electrothermal Analytic Methods For Ca...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Improved Analytical Thermal Rating Method for Cable Joints

He,

Xie,

Wang

et al. 2024

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Literature and Research Structure 2.1.1. The Literature Research on cables can be divided into various categories: cable conductors and their terminals [17][18][19][20][21][22], cable accessories [23][24][25], cable insulators and their aging, water trees, electrical trees [26][27][28], power-cable fault monitoring [29][30][31][32][33], and submarine cables [34][35][36].…”

Section: Methodsmentioning

confidence: 99%

Method for Measuring Interface Pressure of High-Voltage Cables

et al. 2022

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In high-voltage cables, because of the close fit of their internal structures, interface pressure is generated between conductor and insulator, which affects the performance of the cable. Studies on the calculation and testing of the interfacial pressure of cable conductors are scarce because of the lack of a unified formula and the difficulty of direct measurement. As such, in this study, we devised two methods for calculating and measuring the interface pressure of cable conductors. In the first, we used two physical experimental methods. We used the friction between cable components to perform the calculation and create an experimental method for determining cable conductor interface pressure; on the basis of the equation of the pressure inside and outside a thick-walled cylinder using elasticity mechanics, we calculated the interface pressure on the basis of the measurement of the strain state of the inner and outer diameters of each layer of the cable under different assembly and stripping conditions. We verified the effectiveness of the methods through physical tests and simulations using a YJLW03 1 × 1200 high-voltage cable. Then, we used simulation software ANSYS and SolidWorks to calculate the interface pressure. With different simulation settings, we obtained results regarding interface pressure. Lastly, these simulated values were individually compared with two physical tests, and the error was calculated. Results obtained in the ANSYS environment showed that interface pressure values determined by the geometric interference normal stress, geometric interference pressure, contact interference normal stress, and contact interference pressure methods were 39.75, 36.84, 5.76, and 36.57 MPa, respectively. In SolidWorks software, we used the contact-stress and X-axis normal stress methods. Results were all 37.36 MPa. Then, simulation results and experimental results were compared, and error was calculated. The comparison showed that the X-axis orthogonal stress method was the most accurate. Errors between the X-axis orthogonal stress method and the two physical experiments were 1.5% and 0.48%. Through the above simulation and physical experiments, we determined the interface pressure between conductors and insulators in a high-voltage power cable. We obtained the cable interface pressure value through two kinds of physical experiments, and these two methods were clearly reliable. Simulation experiments showed that using SolidWorks software to simulate this problem obtained better results. Research results provide technical support and reference for the calculation and measurement of cable interface pressure and the optimization of cable performance.

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“…It is found that the floating potential caused by grounding failure is responsible for the epoxy insulator breakdown. Liao et al [15] analyzed a breakdown accident of 220 kV cable joint with large expanding rate under closing overvoltage. It is found that the initiation and development of electric trees occurring in the silicon rubber insulation are associated with the large circumferential stress of the cable joint and overvoltage induced by closing operation.…”

Section: Introductionmentioning

confidence: 99%

Evolution of grounding failure‐insulation failure of 10 kV cable joints: Prerequisites of an explosion in enclosed cable trench

Zhao

Liu

Guo

et al. 2023

IET Generation Trans & Dist

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An explosion accident in an enclosed cable trench caused by the discharge of 10 kV three‐phase cable joints is discussed. Combined with the disassembly analysis, the fault recording data analysis, and the validation of experiment, the evolution of the cable joint fault is deduced and discussed. The results show that the trigger of the cable joint fault is the creepage discharge at the cross‐linked polyethylene–silicon rubber insulation interface. This results in the partial breakdown and the grounding failure of three‐phase cable joints. Under the long‐term floating potential and current thermal effect, the insulations are gradually ablated and decomposed into a large amount of combustible gas. Finally, the accumulated combustible gas is ignited by the arc caused by a three‐phase short circuit at the moment of the reclosing operation. The analytical method and conclusions proposed in this paper can provide suggestions and guidance to prevent analogous distribution network cable joint fault accidents.

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Breakdown failure analysis of 220 kV cable joint with large expanding rate under closing overvoltage

Cited by 15 publications

References 20 publications

An Improved Analytical Thermal Rating Method for Cable Joints

An Improved Analytical Thermal Rating Method for Cable Joints

Method for Measuring Interface Pressure of High-Voltage Cables

Evolution of grounding failure‐insulation failure of 10 kV cable joints: Prerequisites of an explosion in enclosed cable trench

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