Gas Bubble Studies and Impulse Tests on Distribution Transformers During Loading Above Nameplate Rating

Kaufmann, Guillermo H.; McMillen, C.J.

doi:10.1109/tpas.1983.317772

Cited by 27 publications

(6 citation statements)

References 6 publications

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“…Researchers have studied the bubble-generating mechanism in oil-pressboard insulation of transformers. Heinrichs [7] discussed gas-evolving mechanisms in oil, pressboard, and combinations of oil and pressboard. Some models approximating the hot-spot configuration were designed to study the critical mechanisms under conditions that were approaching approximating the hot-spot configuration were designed to study the critical mechanisms under conditions that were approaching service overloads.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Qin

Shi

et al. 2018

Energies

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Bubbles will reduce the electric strength of transformer oil, and even result in the breakdown of the insulation. This paper has studied the breakdown voltages of transformer oil and oil-impregnated pressboard under alternating current (AC) and direct current (DC) voltages. In this paper, three types of electrodes were applied: cylinder-plan electrodes, sphere-plan electrodes, and cone-plan electrodes, and the breakdown voltages were measured in both no bubbles and bubbles. The sphere-sphere electrodes were used to study the breakdown voltage of the oil-impregnated pressboard. The results showed that under the influence of bubble, the breakdown voltage of the cylinder-plan electrode dropped the most, and the breakdown voltage of the cone-plan electrode dropped the least. The bubbles motion was the key factor of the breakdown. The discharge types of the oil-impregnated pressboard were different with bubbles, and under DC, the main discharge type was flashover along the oil-impregnated pressboard, while under AC, the main discharge type was breakdown through the oil-impregnated pressboard.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Qin

Shi

et al. 2018

Energies

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“…Based on the results of the study, a maximum transformer overload temperature is recommended. The similar investigation and research is also performed by Kaufmann and McMillen [19]. Oommen and Lindgren [20] conduct the experimental study of the bubble evolution from overloading of transformers.…”

Section: Research Articlementioning

confidence: 98%

Study on dynamics of the bubble in transformer oil under non‐uniform electric field

Zhao

Liu

Lü

et al. 2016

IET Science, Measurement & Technology

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“…Partial discharge can cause progressive deterioration of oil/ pressboard insulation and in some cases may lead to insulation failure [29]. The bubbles present in the oil can reduce the impulse strength of the transformer [30]. In addition, other possible sources of PD are divergent electric fields in the insulation of oil paper due to impurities, such as small drops of water and other tiny particles, which can cause erosion in the pressboard and generate bubbles [31].…”

Section: Correlation Between D3-type Discrepancies and Pd Presence Inmentioning

confidence: 99%

Investigation of High-Frequency Oscillation Discrepancies Presented by Distribution Transformers During Lightning-Impulse Voltage Tests

Pereira

Faria

Villibor

et al. 2021

IEEE Electr. Insul. Mag.

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Gas Bubble Studies and Impulse Tests on Distribution Transformers During Loading Above Nameplate Rating

Cited by 27 publications

References 6 publications

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Study on dynamics of the bubble in transformer oil under non‐uniform electric field

Investigation of High-Frequency Oscillation Discrepancies Presented by Distribution Transformers During Lightning-Impulse Voltage Tests

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