The arcless method of testing high-voltage oil-filled equipment for explosion safety

Darian, L.A.; Kozlov, A.; Polishchuk, V. P.; Povareshkin, M. N.; Son, E. E.; Фортов, В. Е.; Шурупов, А. В.

doi:10.1134/s0040601511140035

Cited by 6 publications

(10 citation statements)

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“…In this context, there have been various reports on pressure rise due to the internal arc of electric power equipment containing insulating oil, which mainly studied transformers . In recent years, it has been conducted investigations by simulation of pressure releasing apparatus and pressure resistance of transformers as well as studies by simulating arc in insulating oil with gunpowder in water .…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…The standard test method for explosion protection of OFEE is based on electric arc ignition in the internal volume of OFEE. Together with our colleagues in works [3][4][5][6] we presented the investigations which justified an alternative test model for explosion protection of OFEE. In this method a high pressure pulse which occurs after ISC was simulated by chemical energy of explosive materials (EM).…”

Section: Introductionmentioning

confidence: 93%

“…Our research results of AD in OFEE test model have been described in details in works [3][4][5][6]. The AD basic parameters resulting from these studies are presented below.…”

Section: Arc Discharge In Transformer Oilmentioning

confidence: 99%

“…The AD basic parameters resulting from these studies are presented below. Experiments [3][4][5][6] were carried out under conditions similar to conditions after ISC occurrence in industrial OFEE, where discharge current increases up to 10 -30 kA in 3-10 ms. In our experiments the maximum discharge current reached 30 kA at the rise time of 1-3 ms.…”

Section: Arc Discharge In Transformer Oilmentioning

confidence: 99%

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Testing of models of explosion protection system for highvoltage oil-filled electrical equipment

Darian¹,

Polistchook²,

Шурупов³

2022

joe

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Explosions of high voltage oil-filled electrical equipment (OFEE) lead to a significant material damage. These explosions occur under action of an arc discharge (AD) which arises after internal short circuit. Modernization of OFEE design and protection systems is the possible way to achieve significant reduction of potential explosion and substantial reduction of material losses. Examination of perspective explosion-proof OFEE designs and new explosion protection systems demands the effective test methods. In present work results of development and application of an arcless source of pulse pressure (ASPP) are described. In ASPP the testing impulse is produced by the jet of powder gases (JPG) which arises at the combustion of explosive materials. In this work results of experimental researches of AD in transformer oil (TO) at conditions typical for AD initial stage have been presented: current rise time was 3-5 ms, the maximum arc current was up to 30 kA, AD burning time was 3-20 ms. The energy released in AD amounted to 0.1 MJ. It was established, that electric field strength in AD column was about 0.2 kV/сm, gas producing factor in AD was 110 l/MJ, growth rate of pressure in TO was about 0.3 MPa/ms. These results allowed to create an ASPP with demanded parameters. Experiments proved that TO flow under action of AD and JPG are similar given that the same influence duration of the energy released in AD is equalled enthalpy of JPG at liquid inlet. In this work the transformer fracturing behavior after explosion has been analyzed; and the requirements for protection systems have been formulated. By means of ASPP the breadboard model tests of two well-known OFEE explosion protection methods were carried out. In the first method it is assumed that the protection is reached due to fast dump of pressure inside of OFEE case when special membranes are opened. In the second protection method it is offered to establish porous coverings on internal surfaces of OFEE cases. Experiments were carried out on OFEE model with the characteristic size of 1 m at action energy up to 1.5 MJ. It was shown, that these systems cannot protect the transformer body from significant damages. The dynamic protection system of transformer (DPS) has been described. The efficiency of this new system using ASPP has been verified in experiments with autotransformer of 25 MW. It was shown that DPS protects the transformer from considerable damages at least at dynamic impulse of about 3 MJ.

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“…Many studies were conducted so far regarding pressure rise in oil-filled power equipment, mainly, transformers [1]. Besides, there are also recent reports on simulation of withstand pressure and pressure relief devices of transformers [2] and on modeling arc in insulating oil by explosives in water [3]. However, previous studies were focused primarily on relationship between arc energy and steady-state pressure rise, or transient pressure rise specific to equipment provided with pressure relief systems, while much remains unclear about basic characteristics of arcs in insulating oil and related pressure rise phenomena as well as effects exerted on pressure rise by arc occurrence position, equipment design, and so on.…”

Section: Introductionmentioning

confidence: 99%

Pressure Rises Due to Arc under Insulating Oil in Closed Vessel—Pressure Fluctuation of Depth Direction in Oil

Tadokoro

Kotari

Ohtaka

et al. 2017

Electrical Engineering Japan

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When a fault arc occurs in oil-filled electric equipment, it generates a flammable gas and a dynamic pressure rise. In this study, the pressure rises due to the arc are measured in a closed vessel containing air and oil for different arc depths. The pressure rises in air and oil with different depth are measured under experimental conditions involving an arc current 6.6 kA, an arc duration of 100 ms. Experimental results show that the frequency of pressure fluctuation varies with the depth of the arc. Our approximate calculation of the pressure fluctuation with consideration of the oil flux is consistent with the experimental results. C⃝ 2017 Wiley Periodicals, Inc. Electr Eng Jpn, 202(2): 43-53, 2018; Published online in Wiley Online Library (wileyonlinelibrary.com).

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The arcless method of testing high-voltage oil-filled equipment for explosion safety

Cited by 6 publications

References 0 publications

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

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

Testing of models of explosion protection system for highvoltage oil-filled electrical equipment

Pressure Rises Due to Arc under Insulating Oil in Closed Vessel—Pressure Fluctuation of Depth Direction in Oil

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