A New Approach to the Analysis of Water Treeing Using Feature Extraction of Vented Type Water Tree Images

Karhan, Mustafa; Çakir, Musa Faruk; Ugur, Mukden

doi:10.1007/s42835-021-00667-y

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…In this study, a water tree test platform was established to induce needle-plate electrode samples to generate water trees, as shown in Figure S7 . The water tree test platform was composed of a power frequency experimental transformer, regulator, protective resistor, divider, experimental sample, and real-time microscopy observation equipment.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, a water tree test platform was established to induce needle-plate electrode samples to generate water trees, as shown in Figure S7. 31 The water tree test platform was composed of a power frequency experimental transformer, regulator, protective resistor, divider, experimental sample, and real-time microscopy observation equipment. To prevent flashover along the surface of the sample during the growth of the water tree, the sample and the electrode were immersed in 25# mineral insulating oil.…”

Section: ■ Introductionmentioning

confidence: 99%

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Magnetically Targeted, Water-Triggered, Self-Healing Microcapsules Based on Microfluidic Techniques Enabling Targeted Healing of Water Tree Damage in Epoxy Resins

Sima

Fan

Sun³

et al. 2022

ACS Appl. Mater. Interfaces

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Repairing the micro-scale damage of insulating materials under a strong electric field has long been a highly desired but challenging task. Among all kinds of damage, water tree damage in the insulating materials of electrical equipment and electronic devices working in humid environments has long been considered irreparable. The main challenge is that residual water prevents the healing agent from filling the water tree branch channel. To solve this problem, this work reports a magnetically targeted, water-triggered, self-healing microcapsule (MTWTSH-MC) that makes a breakthrough against water tree damage based on microfluidic techniques. Targeted microcapsules driven by a directional magnetic field are concentrated to the vulnerable area of the insulating materials, exerting very limited effects on the dielectric. When damage breaks the microcapsules, the healing agent releases and quickly fills the damage channel and then reacts with water in the air or in the branch channel of the water tree, achieving solidification of the healing agent and self-healing of the damage channels. In this way, we can realize self-perception, self-triggering, and self-healing for both mechanical damage and water tree damage in insulation materials without any external stimulation.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Magnetically Targeted, Water-Triggered, Self-Healing Microcapsules Based on Microfluidic Techniques Enabling Targeted Healing of Water Tree Damage in Epoxy Resins

Sima

Fan

Sun³

et al. 2022

ACS Appl. Mater. Interfaces

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“…The differences of the two sensors for samples with pinhole defects relative to samples without defects 6 The differences of the two sensors for anhydrous pinhole defect samples and pinhole water-containing defect samples 7 The differences of the two kinds of sensors for samples with water tree defects relative to samples with pinhole water-containing defects XIAO ET AL.…”

Section: F I G U R E 1mentioning

confidence: 99%

“…For example, excessive cable loading leads to the thermal ageing of insulation layers [1], long-term effects of water and electric field stress lead to water tree ageing [2], and water tree ageing is considered to be the main reason for the degradation in the insulation performance of the widely used XLPE submarine cable system [3,4]. Therefore, judging whether there is water tree ageing in the cable and taking corresponding protective measures are important to ensure the safety of the cables [5,6].…”

Section: Introductionmentioning

confidence: 99%

A novel characterization method for water trees based on the transmission characteristics of complementary split ring resonators

Xiao

Wang

et al. 2021

High Voltage

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In order to achieve rapid and simple non-destructive testing of water trees in materials, a novel water tree characterisation method based on the complementary split ring resonators (CSRR) was proposed. The characteristics of circular CSRR and rectangular CSRR were analysed in high-frequency electromagnetic simulation software. The resonant frequency of CSRR was found to be correlated to the dielectric constant of the materials. In addition, the lumped equivalent circuit parameters of CSRRs were also calculated and simulated. The results of electromagnetic simulations and circuit simulations achieved good consistency. In the experimental part, sensors based on the two kinds of CSRRs were fabricated and were used to detect the water tree defects in low-density polyethylene samples. The experiment results showed that the method of using CSRR sensors to detect water tree is feasible.

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“…The effects of harmonics on underground power cables are examined by considering a real system and using experimental data and shown to result in an excessive temperature rise due to the power losses in the cable [7]. Aging processes such as water treeing, electrical treeing, and dielectric breakdown can be observed in polymeric insulators of cables [8] and the high-temperature operation of cables also contributes to their early aging [9][10][11]. Cable failures and degradations that may occur directly or indirectly in the cable due to harmonics should be prevented [11,12].…”

Section: Introductionmentioning

confidence: 99%

Ampacity Decrease in a Three-phase Power Cable Fed by an Uncontrolled Rectifier and Finding a Lower Limit for the Power Cable Loss

ÇANTA,

MUTLU

2023

European Journal of Engineering and Applied Sciences

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Rectifiers are the most common nonlinear loads encountered in electrical power systems. Uncontrolled rectifiers are cheaper than synchronous rectifiers and more common than them because of this but the currents drawn by uncontrolled rectifiers contain harmonics. In addition, the amplitude of these harmonics depends on the value of the load power and the rectifier parameters. A 3-phase cable can be used to connect a three-phase rectifier to a 3-phase power system. In this study, the power losses of a 3-phase cable fed by a synchronous rectifier and an uncontrolled rectifier were compared. The electrical equivalent of a power cable is frequency dependent. The analysis performed in this study was made by making some assumptions about the frequency-dependent resistance of the cable and the rectifier currents. The analysis shows that when an uncontrolled rectifier is fed by a power cable, the cable always has more loss and heats up more for the same amount of RMS current.

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A New Approach to the Analysis of Water Treeing Using Feature Extraction of Vented Type Water Tree Images

Cited by 6 publications

References 28 publications

Magnetically Targeted, Water-Triggered, Self-Healing Microcapsules Based on Microfluidic Techniques Enabling Targeted Healing of Water Tree Damage in Epoxy Resins

Magnetically Targeted, Water-Triggered, Self-Healing Microcapsules Based on Microfluidic Techniques Enabling Targeted Healing of Water Tree Damage in Epoxy Resins

A novel characterization method for water trees based on the transmission characteristics of complementary split ring resonators

Ampacity Decrease in a Three-phase Power Cable Fed by an Uncontrolled Rectifier and Finding a Lower Limit for the Power Cable Loss

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