Experimental Study on the Gas Bubble Temperature Around an Arc Under Insulation Oil

Yan, Chenguang; Zhou, Xian; Xu, Ya Feng; Wu, Yifei; Líu, Hao; Xu, Che; Wei, Yuzhou; Zhu, Shuyou; Zhang, Baohui

doi:10.1109/tpwrd.2020.3029447

Cited by 22 publications

(7 citation statements)

References 10 publications

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“…As shown in figure 6, the gas cavity quickly expanded within the first 12 ms and soon became covered with carbon, which was the marked byproduct of oil decomposition. Therefore, it is reasonably deduced that when the arc burns, a high-temperature high-pressure gas cavity is produced, and according to experimental findings in [25], the internal temperature of the cavity would reach 1500-2100 K. Considering that the surrounding oil remained at almost ordinary pressure, a considerable pressure difference existed between the gas bubble and insulation oil, which drove the gas cavity to rapidly expand in the earlier stage. As the arc energy continued to be injected into the gas bubble, the bubble grew to a larger volume at t=28 ms.…”

Section: Representative Testing Resultsmentioning

confidence: 93%

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

Yan¹,

Xu²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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In this paper, experimental and theoretical studies were carried out on arc-induced bubble dynamic behaviors in insulation oil. Direct experimental evidence indicated that the arc-induced bubble experiences pulsating growth rather than a continuous expansion. Furthermore, a theoretical model and numerical calculation method were proposed, which revealed the dynamic mechanism of bubble growth. Good agreement between the theoretical results and experimental observations verified the general correctness and feasibility of the proposed method.

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Section: Representative Testing Resultsmentioning

confidence: 93%

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

Yan¹,

Xu²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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“…where Cp is the current-control coefficient. Considering that an air gap of approximately 11.5 cm separates the HV electrode from the grounded electrode, the peak of P(t) is set at approximately 23 kA [27], [28]. A(t) and P(t) at different current settings are plotted in Figures 5(b) and 5(c), respectively.…”

Section: B Npap and Pfa Simulation Conditionsmentioning

confidence: 99%

A Comparative Study of Power Frequency Arcs Influenced by Negative-Polarity Artificial Pulses

Luo

Wang

et al. 2022

IEEE Access

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In this paper, we propose a method to guide power frequency arcs (PFAs) and investigate the electric potential and temperature characteristics of PFAs when a negative-polarity artificial pulse (NPAP) is applied from an artificial pulse generator. Based on a two-dimensional finite-element geometrical simulation model, we acquire and analyze numerical simulation results for the electric-potential and temperature distributions in the presence and absence of NPAPs. The simulation results indicate that the NPAPs accelerate the air ionization and streamer breakdown processes, which physically affects the electric potential and temperature distributions. In addition, to determine how the NPAPs affect the PFA discharge process, we qualitatively compare the arc plasma-coupling simulation results, which suggest that the NPAPs either modify the path of the PFA or change the discharge characteristics. Moreover, we use a PFA generator to experimentally investigate the PFA voltage. These experiments enable direct observation of the PFA path produced by NPAP guides. Finally, the simulation and experimental results demonstrate that the NPAPs provide innovative, simple, and cost-effective improvements in the efficiency of arc-extinguishing devices. This technique is suitable for use with arc-extinguishing devices and has significant prospects for applications in other fields. INDEX TERMSArtificial pulse generator, electric potential, negative polarity artificial pulses, arc plasmacoupling simulation, power frequency arc.

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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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Experimental Study on the Gas Bubble Temperature Around an Arc Under Insulation Oil

Cited by 22 publications

References 10 publications

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

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

A Comparative Study of Power Frequency Arcs Influenced by Negative-Polarity Artificial Pulses

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

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