Parameters Affecting the Velocity of Sound in Transformer Oil

Howells,; Norton,

doi:10.1109/mper.1984.5526050

Cited by 12 publications

(1 citation statement)

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“…11, the time delay (Δt), from appearance of arc power peak upon arc ignition to the appearance of first pressure peak of P oil High , is 175 μs. This time delay Δt shows that the pressure wave propagated from the position between electrodes to the pressure transducer (distance: 0.255 m) at sonic speed (about 1420 m/s at 20°C) [16] in the insulating oil, which was resulted by arc derived bubble formation. In addition, when the sonic speed in all test cases was calculated based on Δt and the distance from the position between electrodes to the pressure transducer (0.255 m), the resultant average experimental sonic speed is 1420 m/s (standard deviation 68 m/s).…”

Section: Relationship Between Bubble Formation and Pmentioning

confidence: 99%

Pressure Rises Due to Arc Under Insulating Oil in Closed Vessel—Relationship between Bubble Behavior and Pressure Rises

Tadokoro

Kotari

Ohtaka

et al. 2016

Elect Comm in Japan

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SUMMARY When a fault arc occurs in oil‐filled electric power equipment such as transformers in transmission and distribution systems, it generates a flammable gas and a dynamic pressure rise that may trigger an explosion. The purpose of this fundamental study is to investigate the effects of the arc under electrical insulation oil on pressure rises in a closed vessel containing air and oil. In particular, this paper is intended to investigate the relationship between the pressure rises and the generated bubble behavior by the arc. The pressure rises in both air and oil are measured under experimental conditions involving an arc current ranging from 2.3 kA to 8.9 kA, an arc duration of 10 ms or 100 ms. Experimental results show that the behavior of a bubble affects the pressure rises in the air and the oil as low‐frequency pressure oscillation comparatively.

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Section: Relationship Between Bubble Formation and Pmentioning

confidence: 99%