Insulation Properties and Interface Defect Simulation of Distribution Network Cable Accessories under Moisture Condition

Li, Guochang; Liang, Xiaojian; Zhang, Jiahao; Li, Xuejing; Wei, Yanhui; Hao, Chuncheng; Liu, Qingquan; Li, Shengtao

doi:10.1109/tdei.2022.3157902

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…Initiation of creepage discharge: From Section 2, it is discovered that there is a protrusion defect at the XLPEouter semiconducting layer interface caused by inappropriate installation. At this position, the electric field is distorted distinctly [17,18], and the insulation is degraded gradually. Faint partial discharge is easy to be activated and promotes the accumulation of space charges [19,20].…”

Section: Initiation and Development Of Creepage Discharge At The Xlpe...mentioning

confidence: 99%

“…It is found that phase-resolved partial discharge patterns depend upon the defect type varying with aging time. G. Li et al [13] established an interface defect model to analyze the effects of typical moisture defect forms and moisture positions on electric field distributions. The result shows that the electric field distortion caused by water trees' defect is the most serious, followed by water film defects and water droplet defects.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Preprint

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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 XLPE-SiR 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 for the analysis of similar fault accidents in the future.

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Section: Initiation and Development Of Creepage Discharge At The Xlpe...mentioning

confidence: 99%

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

Preprint

View full text Add to dashboard Cite

show abstract

“…In this case, the electrical conductivity of EPDM increases with the increase in temperature, leading to an increase in the polarization current. According to the Oven theory of the thermally stimulated current [19], [20], the depth of the charge trap is deepened with the increase in temperature. Heat promotes the detrapping of charges in deeper traps during depolarization processes, resulting in an increase in the depolarization current.…”

Section: A Pdc Of Epdmmentioning

confidence: 99%

Dielectric Loss of EPDM Insulation Subjected to Thermal Stress and Pressure

Lei

Fabiani

et al. 2022

IEEE Access

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The insulation performance of ethylene propylene diene monomers (EPDMs) subjected to multi-stresses in the field is always obscure. To understand the effects of temperature and pressure on the performance of the EPDMs used as insulators for power cables, in this work, focuses were on the dielectric losses of EPDMs under the temperature range of 30-120°C and pressure range of 2-8 bar. The polarization and depolarization currents and the dielectric loss factor of EPDMs under the above conditions have been first measured. The relationship between the depolarization current and dielectric loss factor has been studied based on the correlation of the depolarization charge and the dielectric loss factor at low-frequency. The experimental results showed that the conduction currents and the dielectric loss factor increase with the increase in temperature, but the effect of pressure on the dielectric properties of EPDM is more complicated. There is a strong correlation between the depolarization charge and low-frequency dielectric loss factor, both of which can reflect the change law of the EPDMs' performance. Moreover, the asymmetry coefficient of the dielectric loss factor at low-frequency can be a supplement with regard to describing the deterioration degree of EPDM insulation. The evaluation chart of the insulation performance of the EPDMs has been advanced according to the asymmetry coefficient and the total dielectric loss calculated by the polarization and depolarization currents.

show abstract

“…It is found that phase-resolved partial discharge patterns depend upon the defect type varying with aging time. Li et al [13] established an interface defect model to analyze the effects of typical moisture defect forms and moisture positions on electric field distributions. The result shows that the electric field distortion caused by water trees' defect is the most serious, followed by water film defects and water droplet defects.…”

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

View full text Add to dashboard Cite

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.

show abstract

Insulation Properties and Interface Defect Simulation of Distribution Network Cable Accessories under Moisture Condition

Cited by 15 publications

References 14 publications

Evolution of Grounding Failure-Insulation Failure of 10 kV Cable Joints: Prerequisites of an Explosion in Enclosed Cable Trench

Evolution of Grounding Failure-Insulation Failure of 10 kV Cable Joints: Prerequisites of an Explosion in Enclosed Cable Trench

Dielectric Loss of EPDM Insulation Subjected to Thermal Stress and Pressure

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

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