Hydrodynamic study of the oil flow in a protective relay coupled to a power transformer: CFD simulation and experimental validation

Lins, Ivan; Filho, H. J. B. Lima; Santos, Victória Laysna dos Anjos; Pereira, Júlio César Santos; Mak, José; Vieira, Cynthia Wanick

doi:10.1016/j.engfailanal.2021.105599

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…In summary, solving how to achieve rapid on-site qualitative diagnosis and avoid personnel casualties when staff perform gas extraction operations following minor gas alarms from transformers is particularly crucial. The current online diagnostic technologies mainly include gas chromatography and photoacoustic spectroscopy [ 20 , 21 , 22 , 23 ]. Nevertheless, both methods have long gas component detection cycles, typically in hours, and cannot sensitively and quickly respond to the rapid development of internal defects into serious faults.…”

Section: Introductionmentioning

confidence: 99%

Transformer Monitoring with Electromagnetic Energy Transmission and Wireless Sensing

Xu,

Shang,

et al. 2024

Sensors

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To ensure stable and normal transformer operation, light gas protection of the transformer Buchholz relay is essential. However, false alarms related to light gas protection are common, and troubleshooting them often requires on-site gas sampling by personnel. During this time, the transformer’s operating state may rapidly deteriorate, posing a safety threat to field staff. To tackle these challenges, this work presents the near-field, thin-sliced transformer monitoring system that uses Electromagnetic Energy Transmission and Wireless Sensing Device (ETWSD). The system leverages external wireless energy input to power gas monitoring sensors. Simultaneously, it employs Near-Field Communication to obtain real-time concentrations of light gases, along with the electrified state and temperature. In field testing conducted on transformer relays’ gas collection chambers, the ETWSD effortlessly monitors parameters within warning ranges, encompassing methane gas concentrations around 1000 ppm, leakage voltage ranging from 0–100 V, and relay working temperatures up to 90 °C. Additionally, to facilitate real-time diagnosis for electrical workers, we have developed an Android-based APP software that displays current light gas concentrations, leakage voltage collection values, and temperature, while also enabling threshold judgment, alarms, and data storage. The developed ETWSD is expected to aid on-site personnel in promptly and accurately evaluating transformer light gas protection error alarm faults. It provides a method for simultaneous, contactless, and rapid monitoring of multiple indicators.

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Section: Introductionmentioning

confidence: 99%

Transformer Monitoring with Electromagnetic Energy Transmission and Wireless Sensing

Xu,

Shang,

et al. 2024

Sensors

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“…Computational fluid dynamics (CFD) is a computer-based method to characterize, interpret, and quantify fluid transport phenomena through a numeric solution of the Navier-Stokes equations capable of replicating realistic scenarios with a three-dimensional (3D) domain under unstable conditions [19]. The Navier-Stokes formulations are equations of mass conservation, momentum conservation, and energy conservation (Equations (3)-( 5), respectively) [20]:…”

Section: Introductionmentioning

confidence: 99%

“…where t is the time, → u is the vector velocity, → τ is the stress tensor, ρ is the density, P is the static pressure, → g is the gravitational acceleration vector, k is the thermal conductivity, H is the standard enthalpy, and T is the temperature [20].…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Hydrodynamic Conditions in Reaction Cell for Cement Biomineralization Using Factorial Design and Computational Fluid Dynamics: Prospects for Increased Useful Life of Concrete Structures and Energetic/Environmental Benefits

et al. 2023

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Studies have reported the incorporation of microorganisms into cement to promote the formation of calcium carbonate in cracks of concrete, a process known as biomineralization. The paper aims to improve the process of the cascade system for biomineralization in cement by identifying the best hydrodynamic conditions in a reaction cell in order to increase the useful life of concrete structures and, therefore, bring energy and environmental benefits. Two central composite rotatable designs were used to establish the positioning of the air inlet and outlet in the lateral or upper region of the geometry of the reaction cell. The geometries of the reaction cell were constructed in SOLIDWORKS®, and computational fluid dynamics was performed using the Flow Simulation tool of the same software. The results were submitted to statistical analysis. The best combination of meshes for the simulation was global mesh 4 and local mesh 5. The statistical analysis applied to gas velocity and pressure revealed that air flow rate was the factor with the greatest sensitivity, with R2 values up to 99.9%. The geometry with the air outlet and inlet in the lateral region was considered to be the best option.

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Hydrodynamic study of the oil flow in a protective relay coupled to a power transformer: CFD simulation and experimental validation

Cited by 2 publications

References 21 publications

Transformer Monitoring with Electromagnetic Energy Transmission and Wireless Sensing

Transformer Monitoring with Electromagnetic Energy Transmission and Wireless Sensing

Simulation Study of Hydrodynamic Conditions in Reaction Cell for Cement Biomineralization Using Factorial Design and Computational Fluid Dynamics: Prospects for Increased Useful Life of Concrete Structures and Energetic/Environmental Benefits

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