Lightning impulse breakdown characteristics of SF6 alternative gases for gas-insulated switchgear

Hoshina, Yoshikazu; Sato, Masa‐aki; Shiiki, Motoharu; Hanai, Masahiro; Kaneko, E.

doi:10.1049/ip-smt:20050007

Cited by 19 publications

(10 citation statements)

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“…This behavior is entirely the opposite of the well-known fact that the impulse breakdown strength of air and SF 6 in non-uniform gaps is higher for negative polarity than for positive polarity. This inverse property of CO 2 has been confirmed by other researchers [2,7]. There are still several unknowns in the breakdown of CO2 that require clarification before it can be declared a viable insulating gas.…”

Section: Introductionsupporting

confidence: 74%

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Effect of the pressure on the development of an impulse arc in CO₂

Robledo‐Martinez

Sobral²,

Ruiz-Meza

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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The properties of the impulse discharge in carbon dioxide under variable pressure in the range 26.7 kPa -0.16 MPa (200-1200 Torr) were investigated using fast photography and electrical measurements. In the experiments, fast lightning impulses (70 ns front) were applied to a point/plane gap with gap separation of 6.5 and 11 cm. It was found that the peak current was not affected by pressure; the electric field, on the contrary, did respond to it. The computer simulations and electrical field measurements performed show that the space charge had a dipolar structure. This structure might be responsible for the diminished negative breakdown level observed in CO 2 . It was found that the arc expansion in the first 3 μs is very fast and slows down afterwards following a logarithmic curve in time. The pressure of the gas had a small, inverse effect on the arc's diameter.

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Section: Introductionsupporting

confidence: 74%

“…There are still several unknowns in the breakdown of CO2 that require clarification before it can be declared a viable insulating gas. For example, if a foreign particle is attached to one of the electrodes the positive breakdown level becomes lower than the negative one [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of the pressure on the development of an impulse arc in CO₂

Robledo‐Martinez

Sobral²,

Ruiz-Meza

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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“…On the other hand, the dielectric strength of CO 2 is higher than that of N 2 under impulse voltage [27]. Unlike for CO 2 , the dielectric breakdown in N 2 occurs on the tail of the lightning impulse.…”

Section: Natural Gases: N 2 Co 2 and Omentioning

confidence: 86%

“…This is due to the effective cross-section of O 2 being small and N 2 , which is the main component of the air (see Table 5), being an un-attaching gas for electrons. On the other hand, an 85% CO 2 /15% O 2 mixture shows a marked improvement of more than 15% compared with CO 2 in a divergent field under positive polarity [27].…”

Section: Natural Gases: N 2 Co 2 and Omentioning

confidence: 90%

Recent Advances in the Quest for a New Insulation Gas with a Low Impact on the Environment to Replace Sulfur Hexafluoride (SF6) Gas in High-Voltage Power Network Applications

2017

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Abstract:The growing environmental challenge of electrical energy systems has prompted a substantial increase in renewable energy generation. Such generation systems allow for significant reduction of CO 2 emissions compared with a traditional fossil fuel plant. Furthermore, several improvements in power systems network configuration and operation combined with new technologies have enabled reduction of losses and energy demand, thus contributing to reduction of CO 2 emissions. Another environmental threat identified in electrical networks is the leaking of insulating sulfur hexafluoride (SF 6 ) gas used in electrical gas insulated substations (GIS) and equipment. Because of its Global Warming Potential (GWP) of nearly 24,000 and its long life in the atmosphere (over 3000 years), SF 6 gas was recognized as a greenhouse gas at the 1997 COP3; since then its use and emissions in the atmosphere have been regulated by international treaties. It is expected that as soon as an alternative insulating gas is found, SF 6 use in high-voltage (HV) equipment will be banned. This paper presents an overview of the key research advances made in recent years in the quest to find eco-friendly gases to replace SF 6 . The review reports the main properties of candidate gases that are being investigated; in particular, natural gases (dry air, N 2 or CO 2 ) and polyfluorinated gases especially Trifluoroiodomethane (CF 3 I), Perfluorinated Ketones, Octafluorotetra-hydrofuran, Hydrofluoroolefin (HFOs), and Fluoronitriles are presented and their strengths and weaknesses are discussed with an emphasis on their dielectric properties (especially their dielectric strength), GWP, and boiling point with respect to the minimum operating temperature for HV power network applications.

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“…In uniform electric field, the negative lightning impulse breakdown voltage of gases is generally higher than the positive one. However, some investigators reported that the negative lightning impulse breakdown voltage of some gases such as SF6 is lower than the positive one [1]. On the other hand, in uniform field the breakdown voltage increases with pressure whatever the polarity (Paschen law) beyond the minimum while it isn't always the case for electronegative gases especially for SF6.…”

Section: Introductionmentioning

confidence: 98%

Influence of polarity on breakdown voltage of gases in divergent electric field under lightning impulse voltages

Sadaoui

Béroual

2012

2012 International Conference on High Voltage Engineering and Application

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This paper deals with the influence of the polarity of voltage of different gases (N 2 , dry Air, SF 6 and CO 2 ) and mixtures (SF 6 -N 2 , SF 6 -dry air and SF 6 -CO 2 ) on breakdown voltage (U BDV ) in a sphere-plane and point-plane electrode arrangements under standard lightning impulse voltage stress. It's shown that in point-plane electrode geometry, the negative breakdown voltage U NBDV is always higher than the positive one (U PBDV ) for all investigated gases. While in a sphere-plane electrode system, this rule is not respected. Depending on the electrode gap, the type of gas and its pressure, U NBDV can be either lower than U PBDV (dry air), or first higher and then lower or yet first lower and then higher; the inversion appears at a given pressure that it's not the same according to the gas, gap and polarity. For gas mixtures, U NBDV is always higher than U PBDV whatever SF 6 content.

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Lightning impulse breakdown characteristics of SF6 alternative gases for gas-insulated switchgear

Cited by 19 publications

References 1 publication

Effect of the pressure on the development of an impulse arc in CO₂

Effect of the pressure on the development of an impulse arc in CO₂

Recent Advances in the Quest for a New Insulation Gas with a Low Impact on the Environment to Replace Sulfur Hexafluoride (SF6) Gas in High-Voltage Power Network Applications

Influence of polarity on breakdown voltage of gases in divergent electric field under lightning impulse voltages

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Lightning impulse breakdown characteristics of SF6 alternative gases for gas-insulated switchgear

Cited by 19 publications

References 1 publication

Effect of the pressure on the development of an impulse arc in CO2

Effect of the pressure on the development of an impulse arc in CO2

Recent Advances in the Quest for a New Insulation Gas with a Low Impact on the Environment to Replace Sulfur Hexafluoride (SF6) Gas in High-Voltage Power Network Applications

Influence of polarity on breakdown voltage of gases in divergent electric field under lightning impulse voltages

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Effect of the pressure on the development of an impulse arc in CO₂

Effect of the pressure on the development of an impulse arc in CO₂