Three-dimensional simulation analysis of electric field distribution at the middle joint of 110 kV cable with typical defects

Xu, Shimei; Huang, Xiangqian; Yang, Song; Yu, Bin; Gan, Pengfei

doi:10.1088/1755-1315/647/1/012034

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…Affected by factors such as installation conditions, installation technology, operating environment, and material properties, defects such as bubbles, impurities, and scratches are likely to occur during cable construction. In addition, during cable operation, water may enter the interior of cable joints to form defects such as water beads and moisture [13][14][15]. In the long-term operation of the cable, the above factors are often the most direct causes of cable accessory failure, and simulation calculations are helpful to fully grasp the impact of defects.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

Sun

et al. 2023

Coatings

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Dampness is one of the most important factors leading to the degradation of the insulation performance of cable accessories; it may easily lead to interface defects of composite insulation. In this paper, an electromagnetic field defect model of the cable composite insulation interface is established, and the effects of the defect degree and the defect type on the magnetic flux and the harmonic current are studied. The results show that the magnetic field is uniformly distributed with a decreasing trend when the cable is in good condition, and the grounding current has no obvious harmonic component. For different defects, the magnetic field changes at the defect location are notably different; for water droplets and the water film, the magnetic field distortion is obvious at the location of the defect and sheath, and for water tree defects, the distortion of the magnetic field is significant. In addition, the degree of distortion caused by the same defect at different positions is also different, and the magnetic field contrast is not obvious at different degrees of moisture exposure. The distortion of the grounding current caused by the water tree is higher than that of the water droplet and the water film, and the characteristics of the harmonic components of the grounding current caused by different defects have obvious distinctions. The type of cable defect can be judged by the proportion of harmonic components. This work can be used as a reference for the assessment of the cable insulation defect status.

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Section: Introductionmentioning

confidence: 99%

Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

Sun

et al. 2023

Coatings

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“…Common types of defects include insulation scratches, interface conductive particles, stress cone misalignment, etc. [3]. Under both insulation imperfections and an electric field, the composite interface of the cable joint becomes the weak part of cable insulation, which is prone to interface discharge [4].…”

Section: Introductionmentioning

confidence: 99%

Research on the Growth Characteristics of the Electrical Tree at Polyethylene/Silicone Rubber Composite Interface Under Power Frequency Voltage

Sun,

Zhang,

Wang

et al. 2023

J. Phys.: Conf. Ser.

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During operation, the composite interface of the cable joint will experience a tangential electric field. When the composite interface has insulation defects, it is easy to experience interface discharge. Electrical tree is a phenomenon of electrical degradation and it’s a precursor of polymer breakdown. It is observed in the laboratory that under the power frequency voltage, the electrical tree will initiate at the composite interface, and the tree growth will finally lead to the interface breakdown. This paper investigates the development of an electrical tree at the composite interface of polyethylene/silicone rubber under power frequency voltage through microscopic observation. The results show that the air gap of the interface is the weak position of insulation, and the electrical tree will be initiated from the triple junction of the air gap and the impacted area of the two materials. The increase in voltage amplitude will speed up the initiation. High amplitudes also promote the electrical tree. The electrical tree shape will be changed from a branch structure at low voltage to a single branch structure at high voltage. The study on the electrical tree at the interface provides a visual display of the degradation process of the material before the breakdown at the composite interface.

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“…The reason why we chose a metal stress cone is that the silicon rubber cable joint and stress cone need a long time to install [6,7]. In addition, new faults can probably be introduced if we pursue fast installation [8][9][10]. Sometimes, we need to finish repair and test in a short time.…”

Section: Introductionmentioning

confidence: 99%

Electric Field in Metal Stress Cone of Cable Quick Repair/Test Joint

Sun,

Zhang,

Zhao

et al. 2023

J. Phys.: Conf. Ser.

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In order to expedite power restoration after cable failures, a plug-in GIS (Gas Insulated Switchgear) intermediate joint is designed for cable quick repair/test. During the electric field simulation of this intermediate joint, significant electric field distortions were observed at the metal stress cones and the cable’s semi-conductive layer discontinuity, indicating potential weak points in insulation. To mitigate the electric field distortions within the joint, investigations were conducted on the impact of factors such as the gap width between the metal stress cones and the XLPE cable, the relative position of the semi-conductive layer discontinuity, the stress cone, and the winding length of high dielectric constant tape. The design and installation scheme of the metal stress cone wasa obtained through simulation, which provides a basis for the design and manufacture of the GIS quick repair/test joint.

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Three-dimensional simulation analysis of electric field distribution at the middle joint of 110 kV cable with typical defects

Cited by 6 publications

References 1 publication

Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

Research on the Growth Characteristics of the Electrical Tree at Polyethylene/Silicone Rubber Composite Interface Under Power Frequency Voltage

Electric Field in Metal Stress Cone of Cable Quick Repair/Test Joint

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