Breakdown mechanisms of XLPE cable with insulation defects

Arachchige, Thanuja Gawasingha; Narampanawa, Lakshitha; Ekanayake, Chandima; Ma, Hui

doi:10.1109/ceidp49254.2020.9437457

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…As calculated from Equation (4), the maximum field strength at the needle tip is about 956 kV/mm, and for the pure XLPE, whereas the critical electric field strength required to generate free electrons only needs 285 kV/ mm. 23 Thus, this maximum electric field is sufficient for the high voltage electrode to inject charge into the sample through Schottky emission and field emission, and charge carriers are injected and extracted rapidly under AC voltage. High-energy charge carriers constantly impact the material and release a large amount of energy during the process, which leads to the fracture of the molecular chain and the formation of a low-density zone.…”

Section: Electrical Tree Inception and Growthmentioning

confidence: 99%

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Hong

Chen

Zhu

et al. 2022

J of Applied Polymer Sci

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The effect of adding electron-buffering voltage stabilizer (1 wt% maminobenzoic acid) on the electrical tree-induced degradation of cross-linked polyethylene (XLPE) was studied at high temperatures. The electrical tree inception, growth, and partial discharge characteristics were simultaneously analyzed at 30, 50, and 70 C, respectively. The results showed that the growth rate of electrical tree and partial discharge activity as well as the discharge repetition rate, significantly increased with the temperature for pure XLPE and XLPE stabilizer blend. However, the XLPE stabilizer blend exhibited higher tree inception voltage, lower tree growth rate, and partial discharge activity than pure XLPE. The addition of the voltage stabilizer reduced the carbon layer thickness in the tree channel and offered higher resistance to the electrical tree growth. Surface potential decay demonstrated that the voltage stabilizer addition decreased the trap energy level, but increased the shallow trap density of the XLPE. Quantum chemical calculations showed that the voltage stabilizer enhanced the ability to buffer the high-energy electrons in the XLPE. A high-energy electron buffering mechanism was also proposed to explain the effect of voltage stabilizer on the electrical treeing and partial discharge activity in the XLPE at high temperatures.

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Section: Electrical Tree Inception and Growthmentioning

confidence: 99%

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Hong

Chen

Zhu

et al. 2022

J of Applied Polymer Sci

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“…Under high electric stress, these voids can initiate the PD or electrical trees, which propagates through the insulation and causes the insulation breakdown. 14,15 Exploring new insulation materials with good dielectric characteristics and robust mechanical strength is crucial to ensuring reliability and continuous electric supply. These materials should also be capable of effectively addressing the defects that may arise due to manufacturing faults, the presence of water tree traces, or mechanical stresses.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Later, it was found that not only the traces of water trees can initiate the formation of electrical trees but the presence of protrusion or roughness of the surface of the insulating polymers can also initiate the formation of electrical trees. − Moreover, at the interphase of different materials during the manufacturing of power cables, the formation of voids or cavities cannot be entirely avoided. Under high electric stress, these voids can initiate the PD or electrical trees, which propagates through the insulation and causes the insulation breakdown. , …”

Section: Introductionmentioning

confidence: 99%

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Investigating the Impact of Hardness on Dielectric Breakdown Characteristics of Polyurethane

Samad,

Siew,

Given

et al. 2024

ACS Omega

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Polymeric materials play a vital role in high-voltage insulation, but their insulating properties can deteriorate over time, leading to insulation failures. The presence of voids resulting from manufacturing defects or external stresses can create a highly divergent field, further contributing to this issue. However, certain polymers, such as polyurethane (PU), possess self-healing properties that enable them to repair these voids and restore a uniform electric field distribution, thereby ensuring the reliability of the insulation. Surprisingly, the potential of PU as an insulating material in high-voltage applications remains unexplored. However, the self-healing capability of PU decreases with an increase in the hardness of the material. Therefore, in this study, the dielectric breakdown properties of PU with different levels of hardness, rated on the Shore scale as 40°(soft), 70°(medium), and 90°(hard), were investigated. The AC and DC dielectric breakdown characteristics of these PU variants and dielectric spectra were examined. Additionally, the study explores the relationship between the dielectric properties and the hardness of the material. Our findings revealed that the dielectric breakdown strength of PU increases as the material's hardness is increased under both AC and DC electric stress. However, this may come at the cost of reduced self-healing capabilities of PU. Therefore, there is a need to balance the hardness of the material with its ability to recover from breakdown events. The findings from this study can be useful for researchers and engineers, as they offer valuable insights into the dielectric properties of PU at various hardness levels.

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“…They typically happen inside cavities, cracks, or any foreign material present in a solid insulator, or bubbles in the liquid dielectric as noted in references [11,12]. Manufacturing defects [36], surface contamination [38], operating environment such as temperature and humidity [28,29] and ageing of material [15,37] can initiate PD event and the type of applied voltage and the insulation medium [29][30][31][32][33]. The theory of PD occurrence is essentially identical for all PD types, therefore the below mentioned categorization is simply a way of organizing it based on discharge location and the various forms it takes.…”

Section: Introductionmentioning

confidence: 99%

A review: partial discharge in medium voltage cross-linked polyethylene XLPE cable

Abdul Bahari,

Mei,

Mohd Ariffin

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Power cables are one of the equipment that plays a vital role in the power system network, either in High Voltage (HV) or Medium Voltage (MV) network. To ensure a reliable power supply and distribution, the integrity and the condition of the cable system must be ensured. Partial Discharge (PD) diagnosis is a valuable tool to analyse and evaluate the condition of the insulation. The purpose of this paper is to review how PD activity is being utilized to assess the condition of the XLPE (cross-linked polyethylene) cables specifically in MV level where a review of existing PD test methodology that are used by researchers and engineers to diagnose the insulation condition of the cable will be presented.

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Breakdown mechanisms of XLPE cable with insulation defects

Cited by 7 publications

References 11 publications

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Investigating the Impact of Hardness on Dielectric Breakdown Characteristics of Polyurethane

A review: partial discharge in medium voltage cross-linked polyethylene XLPE cable

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