Effect of Floating Metallic Particles in Pre-Breakdown and Breakdown Characteristics of Oil Transformer under DC Voltage

Negara, I Made Yulistya; Fahmi, Daniar; Asfani, Dimas Anton; Hernanda, I Gusti Ngurah Satriyadi; Wahyudi, Mochammad; Ibrahim, Muhammad Novis

doi:10.3390/en14123669

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Figure 14 shows that the maximum electric field strength around the particle reaches ∼10 kV/mm, which generally exceeds the critical field strength for PDs in the oil [29, 32–34]. It can be seen that when the electrode was singly covered, the electric field intensity in the gap between the metallic particle and the electrode is smaller than that for the non‐covered condition and larger than that for the double‐covered condition.…”

Section: Discussionmentioning

confidence: 99%

Motion behaviours and PD characteristic of free metallic particles in flowing transformer oil with paper‐covered electrodes

Yao

Pan

et al. 2022

IET Generation Trans & Dist

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The introduction of solid dielectrics to electrode surfaces will change the motion behaviours of free metallic particles and in turn affect partial discharge (PD) characteristics in transformer oil. To estimate the influence, the metallic particles movement in flowing oil was compared between different cases with and without insulating paper covering electrodes here. When the electrodes were bare, particles executed up‐down movements repeatedly in the vertical direction. As the electrodes were paper‐covered, the particles would settle on the paper surface for a period of time. Simultaneously, the PD characteristics caused by metallic particles were measured. When the electrodes were bare, the discharges concentrated in 0–90° and 300–360° and the PD magnitude reached 390 pC. When the double electrodes were paper‐covered, the PD magnitude decreased by 67% and the concentration phases of PDs would migrate to 45° and 160°. In order to analyse the experimental results, a simulation model with a paper‐covered boundary was constructed. Simulated trajectories of particles were in accord with the experiment results. Base on the model, the particle motion characteristics were obtained and the electric field distribution between the particle and electrode was calculated. Finally, the influence of paper‐covering on PD characteristics was discussed.

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Section: Discussionmentioning

confidence: 99%

Motion behaviours and PD characteristic of free metallic particles in flowing transformer oil with paper‐covered electrodes

Yao

Pan

et al. 2022

IET Generation Trans & Dist

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Understanding the Forming Mechanism of “Metallic Particle Bridges” in Flowing Transformer Oil Under DC Voltage: Experiments and Simulations

Yao,

Pan,

Pan

et al. 2024

IEEE Trans. Dielect. Electr. Insul.

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The Influence of Iron Particle Contamination on the Breakdown Characteristics of Circulating Mineral Oil under DC Voltage

Fahmi,

Akbar,

Yulistya Negara

et al. 2024

Eng. Technol. Appl. Sci. Res.

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The presence of metallic particles can lead to the degradation of transformer oil due to the intensification of the electric fields near the conductive components. The primary objective of this research was to investigate the impact of iron impurities on the electrical properties of Mineral Oil (MO), particularly under conditions of continuous flow. Five distinct samples with varying levels of contaminants were carefully prepared for analysis. A specialized chamber was designed to replicate the circulation conditions of oil within an operating transformer. The focus of the investigation was on the breakdown characteristics under DC voltages. The results indicated that higher concentrations of iron impurities were associated with a reduction in breakdown voltage although the circulation of oil exhibited a beneficial effect. To validate these findings, Finite Element Method (FEM)-based simulations were conducted. The analysis of the electric field distribution revealed that iron impurities amplified the electric field intensity, while circulation served to mitigate this effect. Furthermore, the simulations tracking the trajectory of iron particles demonstrated that circulation hindered the particles from reaching the electrodes, thereby diminishing discharge events and lowering the risk of dielectric failure. In conclusion, the circulation of MO enhanced its breakdown voltage, although the presence of iron contamination could still pose a risk under DC voltage conditions.

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Effect of Floating Metallic Particles in Pre-Breakdown and Breakdown Characteristics of Oil Transformer under DC Voltage

Cited by 3 publications

References 23 publications

Motion behaviours and PD characteristic of free metallic particles in flowing transformer oil with paper‐covered electrodes

Motion behaviours and PD characteristic of free metallic particles in flowing transformer oil with paper‐covered electrodes

Understanding the Forming Mechanism of “Metallic Particle Bridges” in Flowing Transformer Oil Under DC Voltage: Experiments and Simulations

The Influence of Iron Particle Contamination on the Breakdown Characteristics of Circulating Mineral Oil under DC Voltage

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