Evaluation of Thermal Interruption Capability in SF&lt;sub&gt;6&lt;/sub&gt; Gas Circuit Breakers with Re-ignition Voltage and its Application to Experimental Design

Urai, Hajime; Ooshita, Youichi; Koizumi, Makoto; Tsukushi, Masanori

doi:10.1541/ieejpes.132.407

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…A small model circuit breaker [3] designed for interruption research was used to measure hot gas exhaust characteristics. The puffer interrupter consists of a piston and cylinder to build pressure by mechanical compression.…”

Section: A Small Model Circuit Breakermentioning

confidence: 99%

Measurement of hot gas exhaust characteristics in SF<inf>6</inf> circuit breaker with small model interrupter

Urai

Koizumi

Ooshita

et al. 2013

2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)

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High-voltage circuit breakers have continuously been developed to reduce their size and operating energy. In the current interruption process, hot gas is generated and exhausted out of the conducting exhaust tube. The hot gas causes electrical breakdown at the exit of the exhaust tube. The hot gas characteristics in the exhaust tube were measured to clarify the dielectric strength. Two measurement methods, the small gap discharge method and the extra-fine thermocouple, were used to estimate the temperature of the hot gas. In the small gap discharge method, the temperature was deduced from the breakdown voltage at the small gap by referencing the critical electric field strength. The critical electric field strength is the electric field strength where ionization coefficient is equal to electron attachment one. An extra-fine thermocouple with a 25 micron tip was also used to measure the temperature on a trial basis. The response speed of the thermocouple was slower than that of transient change of temperature in the interruption process. First-order response lag was compensated by de-convolution with fast Fourier transform (FFT). As a result, the peak value of the temperature in the conducting exhaust tube agreed well with the results estimated by the other method.

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Section: A Small Model Circuit Breakermentioning

confidence: 99%

Measurement of hot gas exhaust characteristics in SF<inf>6</inf> circuit breaker with small model interrupter

Urai

Koizumi

Ooshita

et al. 2013

2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)

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“…This is convenient to evaluate interrupting performance of high‐voltage circuit breakers in terms of efficiency because small model interrupters are suitable to survey geometrically modified parameters of product‐scale interrupters. Especially for SLF interrupting performance, studies have been conducted to evaluate the relationship between interrupting performance and arc characteristics by using small experimental models [4–7]. Digital testing has been proposed to quantitatively evaluate the thermal interruption performance of circuit breakers with arc characteristics around current zero (CZ) [8, 9].…”

Section: Introductionmentioning

confidence: 99%

Interrupter Size Effect of High‐Voltage Gas Circuit Breaker on Thermal Interruption Performance and Current Zero Properties

Sakuyama

Kotsuji

Terada

et al. 2020

IEEJ Transactions Elec Engng

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Small model interrupters are convenient to investigate interrupting performance of high-voltage gas circuit breakers in terms of efficiency. However, the equivalence of interruption phenomena of small model interrupters (e.g., interrupting performance, interruption criteria, and geometric sensitivity) to product-scale interrupters has not been clarified. Interrupting tests with small and large model interrupters were carried out with the dimensions of the interrupter as parameters to clarify the effects of modified interrupter dimensions on blast pressure and interrupting performance. Arc voltage and arc conductance were measured to acquire detailed electrical behavior in the thermal interrupting phase. In the results, small model interrupters showed the same performance trends as geometrically modified large model interrupters. By introducing an interrupter size factor, the boundary of the extinction peak of the arc voltage and arc conductance at 200 ns before current zero that distinguishes the success and failure of interruption for both small and large models agreed well. Moreover, the arc parameters determined by Cassie and Mayr arc models were analyzed with consideration to interrupter size factor. In conclusion, the interrupter size factor was validated from the point of arc phenomena and an equivalence of small model to product-scale interrupter was confirmed.

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“…This is because if the arc is not cooled sufficiently, then transient recovery voltage applied from the system brings about reignition so that the arc ignites again . There is much research on appropriate countermeasures, and decrease in arc conductance at current zero point is reported to contribute to current interruption . However, current interruption is a physical phenomenon of the microsecond order when temperature distribution, fluid velocity distribution, and other conditions change abruptly; as a result, the process of decrease in air conductance is difficult to elucidate experimentally.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electron and heavy particle velocity distribution under consideration of nonthermal equilibrium arc

Nemoto

Iwata

Maeda

et al. 2019

Elect Comm in Japan

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The circuit breaker is required to interrupt the current in order to prevent the spreading fault current. The reignition caused by the remaining high‐temperature gas in the opening of circuit breaker occurs. As this countermeasure, the external magnetic field application and blast gas to arc are used in order to decrease the arc temperature. It has been reported that the nonthermal equilibrium of arc is remarkable near the electrode and post arc. However, few reports have the analysis of separating electron and heavy particle momentums under consideration of the nonthermal equilibrium because the physical phenomena are complicated in the nonthermal equilibrium. In this paper, the electron and heavy particle velocity distribution under consideration of nonthermal equilibrium arc were analyzed. As a result, it is possible to quantify the electron and heavy particle velocity. The electron velocity distribution is dominant to the electric potential distribution. On the other hand, the heavy particle velocity distribution is dominant to the pressure gradient. Therefore, the difference between the electron and heavy particle velocity distribution was elucidated.

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Evaluation of Thermal Interruption Capability in SF<sub>6</sub> Gas Circuit Breakers with Re-ignition Voltage and its Application to Experimental Design

Cited by 7 publications

References 4 publications

Measurement of hot gas exhaust characteristics in SF<inf>6</inf> circuit breaker with small model interrupter

Measurement of hot gas exhaust characteristics in SF<inf>6</inf> circuit breaker with small model interrupter

Interrupter Size Effect of High‐Voltage Gas Circuit Breaker on Thermal Interruption Performance and Current Zero Properties

Analysis of electron and heavy particle velocity distribution under consideration of nonthermal equilibrium arc

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