Investigation of the gas bubble dynamics induced by an electric arc in insulation oil

Yan, Chenguang; Xu, Ya Feng; Zhang, Peng; Kang, Shiqi; Zhou, Xian; Zhu, Shuyou

doi:10.1088/2058-6272/ac5af9

Cited by 11 publications

(2 citation statements)

References 21 publications

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“…To investigate the non-linear arc conductance characteristics, on-site arcing tests under insulation oil were carried out within a closed compartment, in which the electric arc was ignited by fusing a copper wire linking two electrodes [23,24]. Figure 3 illustrates the arcing test system loop in this work, which is configured with an intermediate transformer (IT), switches, breakers, reactors and the test closed compartment.…”

Section: Non-linear Arc-in-oil Conductancementioning

confidence: 99%

Bidirectional field–circuit coupling analysis of converter transformer inter‐tap short‐circuit faults in on‐load tap changers

Yan

Zhang

et al. 2022

IET Generation Trans & Dist

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Converter transformer inter‐tap short‐circuit faults in on‐load tap changers have occurred successively in recent years, resulting in severe accidents and enormous losses. Due to the lack of an effective model and credible arc‐in‐oil conductance parameters, related fault analysis has remained a challenge. This paper develops a bidirectional field–circuit coupling method for modelling inter‐tap faults, in which the electromagnetic field and electric circuit are directly coupled and simultaneously solved. After verification based on on‐site arcing tests, the Schavemaker model is applied to calculate the non‐linear arc conductance. Taking a ±800 kV UHVDC system as a study case, inter‐tap faults in a 415 MVA/500 kV converter transformer are simulated and analysed. Under an inter‐tap fault, the flux distribution is significantly distorted, with large radial leakage fluxes near the shorted turns, and the circulating current can reach tens or even hundreds of kiloamperes. Further calculation results for faults between various taps indicate that leakage flux distortion and the change in the transformation ratio are the main factors influencing the short‐circuit current. These representative findings effectively reveal the variation characteristics of the leakage flux and the short‐circuit current as well as the non‐linear relationship between fault severity and tap position under inter‐tap faults.

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Section: Non-linear Arc-in-oil Conductancementioning

confidence: 99%

Bidirectional field–circuit coupling analysis of converter transformer inter‐tap short‐circuit faults in on‐load tap changers

Yan

Zhang

et al. 2022

IET Generation Trans & Dist

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, experiments have been conducted to advance the understanding of this field further. [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Study on High Energy Discharge Characteristics Caused by Arc Faults in Transformer Turret

Hu,

Huang,

Liu

et al. 2023

IEEE Access

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The power transformer is an essential equipment in the UHV transmission system. High energy discharge resulting from arc faults in the transformer turret can lead to an explosion, posing a serious threat to the safe and stable operation of the power system. At present, there is a lack of experimental research on arc discharge faults in the transformer turret. The ignition and explosion process remains unclear, which limits the improvement of transformer explosion-proof performance. To address this issue, a test platform of arc discharge fault in the transformer turret was constructed. High-current and high-deflagration capacity simulation short-circuit tests were carried out, and the voltage and current waveforms in the arc discharge process were obtained. This facilitated the quantitative characterization of discharge energy and analysis of the arc energy flow conversion. The test results highlighted that arc energy and arc current are the important factors affecting the voltage boost in the riser. The arc process of casing rupture under high current (1400 A) can be divided into two stages: "smooth" and "sudden". The insulating oil after high energy discharge and the gas escaping from the oil were analyzed by chromatographic methods. The results revealed that the oil cracking occurs after high energy discharge, significantly increasing various fault characteristic gases in the oil. Among these gases, H 2 , CH 4 , C 2 H 2 , and C 2 H 4 exhibited the highest total content in the oil, while H 2 , CH 4 , and C 2 H 4 presented the greatest range in the escaped gas, accounting for more than 75% of the total volume. This work elucidates the physical mechanism of the internal short-circuit fault of the transformer turret, and holds crucial guiding significance for the transformer explosion-proof design.INDEX TERMS Transformer turret, arc failure, high energy discharge, arc energy, chromatographic analysis.

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Numerically Investigating Interturn Arcing Faults Inside a UHV Converter Transformer

Liang,

Zhu,

Zhang

et al. 2024

Lecture Notes in Electrical Engineering

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Investigation of the gas bubble dynamics induced by an electric arc in insulation oil

Cited by 11 publications

References 21 publications

Bidirectional field–circuit coupling analysis of converter transformer inter‐tap short‐circuit faults in on‐load tap changers

Bidirectional field–circuit coupling analysis of converter transformer inter‐tap short‐circuit faults in on‐load tap changers

Study on High Energy Discharge Characteristics Caused by Arc Faults in Transformer Turret

Numerically Investigating Interturn Arcing Faults Inside a UHV Converter Transformer

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