Dielectric Phase in an SF6 Model Breaker

Schoetzau, H. J.; Meili, H. P.; Fischer, E.; Sturzenegger, Ch.; Graf, Hans Peter

doi:10.1109/tpas.1985.319182

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…The recovery curve features great similarity with experimental curves previously found for SF 6 [2][3][4] or other insulating gases recovering more slowly [25][26][27], for a variety of gas pressure and test gap configurations. In fact, Figure 9 presents also the SF 6 normalized recovery curves obtained by other research groups: Schoetzau et al (SCO) using an industrial circuit-breaker with double gas flow arrangement [3], and Stokes et al (STO) [4] based on an experimental simulation with metal vapor pollution.…”

Section: Dielectric Recovery Characteristics Of Sfsupporting

confidence: 81%

“…In fact, Figure 9 presents also the SF 6 normalized recovery curves obtained by other research groups: Schoetzau et al (SCO) using an industrial circuit-breaker with double gas flow arrangement [3], and Stokes et al (STO) [4] based on an experimental simulation with metal vapor pollution.…”

Section: Dielectric Recovery Characteristics Of Sfmentioning

confidence: 97%

“…The dielectric phase has already been studied under various experimental conditions. For instance, an industrial unit has been investigated using gas flow for arc column cooling [1][2][3]. Elsewhere, an experimental simulation of the interruption phenomena has been set-up, by means of a rotating arc between fixed contacts [4], without avoiding the metallic vapor contamination of the gas.…”

Section: Introductionmentioning

confidence: 99%

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SF₆ post‐arc recovery characteristics

Spiliopoulos

2004

Int Trans Elec Energy Syst

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SUMMARYIn SF 6 circuit breakers, the result of the interruption, during the dielectric post-arc phase, depends on the capability of the arcing region to withstand the applied recovery voltage. An idealized model breaker experiment is designed to investigate the SF 6 recovery characteristics minimizing the effect of various factors such as metal vapor pollution, arc roots stagnation and gas-flow modifications. The gas heating is obtained by a power arc in movement. The experimental simulation of the interruption allows the study of the gas recovery behavior as a function of the decaying plasma properties. The so-obtained recovery characteristics exhibit distinct phases with recovery time increment and also dependencies on geometrical and electrical test parameters.

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Section: Dielectric Recovery Characteristics Of Sfsupporting

confidence: 81%

Section: Dielectric Recovery Characteristics Of Sfmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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SF₆ post‐arc recovery characteristics

Spiliopoulos

2004

Int Trans Elec Energy Syst

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“…Time scales for thermal reignition in well-designed SF 6 circuit breakers are typically in the range of a few microseconds [23]. However, the transition regime between thermal and dielectric breakdown (referred to as Paschen by Schoetzau) regimes during which temperatures above 1500 K exist has been found to last up to 200 µs for a model double flow circuit breaker in SF 6 by Schoetzau [24]. It is likely that this time scale extends considerably in case of an unblown, free burning arc in a very small electrode gap (i.e.…”

Section: Example Validation Measurementsmentioning

confidence: 99%

Prediction of Bus-Transfer Switching in Future HVdc Substations

Ritter

Franck

2018

IEEE Trans. Power Delivery

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Abstract-Prior research has characterized bus-transfer switching capabilities of disconnectors commonly found in ac gas insulated switchgear (GIS) by means of a limit performance prediction. A large number of dc bus-transfer tests was conducted on a modified bus-transfer test setup in order to study the applicability of these findings for the use of disconnectors in future HVdc substations. It was found that the ac extinction criterion based solely on the instantaneous recovery voltage and the expected arc voltage at current zero is also valid for dc bustransfer switching. However, due to the high frequency harmonics inherent to HVdc power transmission, the process of reaching the initial current zero and the extinction of the switching arc at current zero have been discovered to be independent to a certain degree. For negligible harmonic content of the switching current, arcing times below 20 ms have been predicted for reasonable sizes of substations and realistic dc current magnitudes, which is certainly within the capabilities of existing ac disconnectors. The previously devised limit performance prediction can be applied to gauge influences of different harmonic current contents and small modifications to the disconnector in simulation by applying the reignition criterion at the initial and all subsequent current zeros. Ultimately, however, exact knowledge of frequency and magnitude of the harmonic currents is needed in order to perform accurate predictions.

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“…In fact, study of the plasma mean temperature evolution shows that 300 ms after arc extinction the estimated value decays below the SF 6 molecule dissociation limit (of about 2100 K) [13]. For such conditions the post-arc dielectric strength of the recovering plasma is proportional to gas density as has been shown by other research groups [15][16][17]. The ignition of this last phase depends on factors acting in the breaker chamber such as gas flow or gas pollution by metal vapor.…”

Section: Sf 6 Recovery Characteristicsmentioning

confidence: 82%

The effects of moisture and gaseous additives on SF6 recovery characteristics

Spiliopoulos¹

2006

Euro. Trans. Electr. Power

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SUMMARYIn order to investigate the intrinsic recovery characteristics of SF 6 an idealized model-breaker experiment is designed. The experimental simulation of the interruption phenomena offers the possibility to study the evolution of the free-decaying plasma dielectric strength against the recovery time. The effect of gaseous additives such as air, nitrogen and oxygen on the SF 6 recovery characteristics has been researched. The obtained recovery curves show distinct phases as for pure SF 6 . The influence depends on the gaseous additive nature and its proportion to the gaseous mixture. The presence of water vapor (humidity) in the breaking chamber is proved to be a degradation agent of the SF 6 insulating and recovery properties. Both dielectric and post-arc recovery studies show that the gas dielectric strength reduces with the increment of the humidity concentration.

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Dielectric Phase in an SF6 Model Breaker

Cited by 9 publications

References 11 publications

SF₆ post‐arc recovery characteristics

SF₆ post‐arc recovery characteristics

Prediction of Bus-Transfer Switching in Future HVdc Substations

The effects of moisture and gaseous additives on SF6 recovery characteristics

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Dielectric Phase in an SF6 Model Breaker

Cited by 9 publications

References 11 publications

SF6 post‐arc recovery characteristics

SF6 post‐arc recovery characteristics

Prediction of Bus-Transfer Switching in Future HVdc Substations

The effects of moisture and gaseous additives on SF6 recovery characteristics

Contact Info

Product

Resources

About

SF₆ post‐arc recovery characteristics

SF₆ post‐arc recovery characteristics