Acid Rain Pollution Effect on the Electric Field Distribution of a Glass Insulator

Ilomuanya, Chibuike; Nekahi, A.; Farokhi, S.

doi:10.1109/ichve.2018.8642231

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…The shank of the composite insulator is made of fiberglass or epoxy, and the sheds of the composite insulator are made of composite materials. The hydrophobic nature of composite materials discretizes water into small droplets on the insulator surface and ensures good performance of insulators under contaminated conditions [5,6]. However, the humid pollution could form a layer under the severely contaminated environment and increase the leakage current density [7,8].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Dry Band Formation and Arcing Processes on the Polluted Composite Insulator Surface

Gao

2019

Energies

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This paper modeled the dry band formation and arcing processes on the composite insulator surface to investigate the mechanism of dry band arcing and optimize the insulator geometry. The model calculates the instantaneous electric and thermal fields before and after arc initialization by a generalized finite difference time domain (GFDTD) method. This method improves the field calculation accuracy at a high precision requirement area and reduces the computational complexity at a low precision requirement area. Heat transfer on the insulator surface is evaluated by a thermal energy balance equation to simulate a dry band formation process. Flashover experiments were conducted under contaminated conditions to verify the theoretical model. Both simulation and experiments results show that dry bands were initially formed close to high voltage (HV) and ground electrodes because the electric field and leakage current density around electrode are higher when compared to other locations along the insulator creepage distance. Three geometry factors (creepage factor, shed angle, and alternative shed ratio) were optimized when the insulator creepage distances remained the same. Fifty percent flashover voltage and average duration time from dry band generation moment to flashover were calculated to evaluate the insulator performance under contaminated conditions. This model analyzes the dry band arcing process on the insulator surface and provides detailed information for engineers in composite insulator design.

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Section: Introductionmentioning

confidence: 99%

Modeling of Dry Band Formation and Arcing Processes on the Polluted Composite Insulator Surface

Gao

2019

Energies

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“…because the swampland is extremely difficult and muddy. In the swampland study, a true grounding resistance value will be determined, and it will be compared to research performed by other researchers on dry land or farmland, which has a grounding resistance and resistivity exceeding 100 m. Different soil types certainly have different soil resistivity levels with different soil hydrogen potential (pH) (Ishiwu et al, 2020;Tiimub et al, 2020), and have different water hydrogen potential (pH) (Ishiwu et al, 2020;Ilomuanya et al, 2019), interest the researchers more in researching freshwater swamps, either by observation or by other methods (Andi et al, 2022). So that the results of research on swamps, particularly freshwater swamps, serve as a guide for the community to plan and build grounding installations in freshwater swamps, protecting living organisms from contact voltage and step voltage generated by leakage current.…”

Section: Introductionmentioning

confidence: 99%

Using copper-coated round rod electrodes at various depths in freshwater marshes

Putra,

Nawawi,

Jambak

2023

Journal of Multidisciplinary Academic and Practice Studies

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Purpose: High-voltage electrical equipment requires a grounding installation in order to protect lives in freshwater swamps with a hydrogen potential of 6.75. To build a grounding structure, it is required to know the resistance value and grounding materials, namely copper-coated rod electrodes at different depths. Research methodology: The research was conducted in a freshwater swamp close to the shampooing substation using field observations and direct measurement of soil resistance values, followed by a literature review and comparisons using COMSOL simulation and FEM Analysis. Results: The results of direct research and simulations indicate that in order to accomplish a grounding resistance value < 5 ohms according to the PUIL 2011 standard for a single rod system made of copper, it is necessary to optimize the depth of the grounding electrode within a range of 10 meters, which differs from the simulation results of ground resistance measurement and the Comsol application. The percentage error is 1.05%. Limitations: This research analyzes the results of measurements and grounding analysis using Comsol Multiphysics at a depth of 1 meter for a particular type of copper-coated round rod electrode at depths of 1, 1.5, and 2 meters. Contributions: The results of the study offer information on the usefulness of grounding resistance in freshwater wetlands with a pH greater than 6, where several rod electrode types are utilized to compare future research.

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“…The circumstances surrounding a high voltage insulator culminating in the contamination deposition and accumulation, and the fluctuating wetting and cleansing of the insulator, are a result of interaction of several meteorological characters with each other and with the dielectric surface. The nature and constituents of insulator pollution is not solely dependent on anthropogenic elements but is greatly affected by the transport flow characteristics of pollutants [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

A Study of the Cleansing Effect of Precipitation and Wind on Polluted Outdoor High Voltage Glass Cap and Pin Insulator

2022

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In this work, the extent of natural cleansing effect of rainfall, wind and fog or a combination of these on an insulator string were investigated. Results showed that pollution losses progress with time with a considerable fraction of losses occurring within 15 minutes of testing. While wind alone played little or no role in surface cleansing, it increases the extent of cleansing by rainfall. The topsides of insulators were found to be more affected by natural cleansing compared to the underside. Equivalent Salt Deposit Density (ESDD) and Non-Soluble Deposit Density (NSDD) measurements were carried out. ESDD was found to be higher in the lower disc irrespective of the weather condition the insulator string has been subjected to. NSDD measurements established no pattern on how natural cleansing was impacted by disc position on a string, demonstrating the random nature of pollution-cleansing cycle of outdoor insulators. Insulator performance was assessed by high voltage AC tests and monitoring of partial discharge events using Radio Frequency antennas and a High Frequency Current Transformer (HFCT). Measured output by the HFCT showed that leakage current decreases uniformly with time, and the speed at which this occurs is an indication of the intensity of natural cleansing activity.

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Acid Rain Pollution Effect on the Electric Field Distribution of a Glass Insulator

Cited by 7 publications

References 6 publications

Modeling of Dry Band Formation and Arcing Processes on the Polluted Composite Insulator Surface

Modeling of Dry Band Formation and Arcing Processes on the Polluted Composite Insulator Surface

Using copper-coated round rod electrodes at various depths in freshwater marshes

A Study of the Cleansing Effect of Precipitation and Wind on Polluted Outdoor High Voltage Glass Cap and Pin Insulator

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