An Arc Study at High DC Current Levels in Automotive Applications

Sallais, S.; Jemaa, N. Ben; Carvou, Erwann; Bourda, C.; Jeannot, D.

doi:10.1109/tcapt.2007.903499

Cited by 15 publications

(5 citation statements)

References 9 publications

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“…The experiments show that the current minimum should reach around 100 A and then current reduction self-perpetuates (chopping value). This is in agreement with the previous studies that have shown that the arc voltage curve (in air) has inflection point at around 50 -150 A [11], and at lower currents the IV curve has negative slope leading to selfextinguishing property.…”

Section: Resultssupporting

confidence: 93%

Multibreak LC DC Circuit Breaker

Jovcic

2022

2022 IEEE Power &Amp; Energy Society General Meeting (PESGM)

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LC DC Circuit breaker has previously demonstrated great potential for applications with DC grids at high or medium voltage, and this paper presents further technology improvements based on an experimental study. The increase in the arc voltage is analysed as the number of break points increases, since arc voltage critically determines magnitude of DC current that can be commutated. The paper describes the design of a 4-break contact assembly which provides total air gap of around 6 mm. It is concluded that it is feasible to build a 4-break disconnector with a 5 m/s gap velocity and with around 30-40 µs tolerance in the opening time of the four breaks. The experiments show that each break point increases the gap voltage and the commutating current almost proportionally to the number of break points. The measurements confirm that 4-break LC DC Circuit Breaker using 800 µF capacitor can commutate 930 A DC current with around 4.2 kV recovery voltage. It is measured that the commutation occurs 290 µs after the trip signal, which also denotes the time when DC CB begins inserting increasing counter voltage, and which is faster than most commercial DC breakers.

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Section: Resultssupporting

confidence: 93%

Multibreak LC DC Circuit Breaker

Jovcic

2022

2022 IEEE Power &Amp; Energy Society General Meeting (PESGM)

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“…8 shows the impact of different timing of Tch using zoomed curve for the gap voltage. The separation of contact occurs T0 =320 µs after the trip signal as seen by the gap voltage rise to around 30 V. This arc voltage is in broad agreement with the previous research [18]. Such arc voltage is adequate to commutate currents up to around 300-400 A with arc-only commutation [11].…”

Section: Experimental Testing a Hardware Set Upsupporting

confidence: 90%

LC DC Circuit Breaker based on Pre-charged Capacitor Commutation

Jovcic

2022

Electric Power Systems Research

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“…There is abundant literature on arc voltage studies, both at low voltage [16] and high voltage [17], [18] applications. However, the commercial switches predominantly utilise single break point, while non-arcing disconnectors may employ multiple break points [14].…”

Section: A Break Points Connected In Seriesmentioning

confidence: 99%

Development and Experimental Evaluation of 2 -10 Kv LC DC Circuit Breaker Module

Jovcic

Kovacevic

2022

IEEE Trans. Power Delivery

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The article analyses design options for a practical 2-10 kV, 1-2 kA LC DC Circuit Breaker module. The impact of multiple series break points with the ultra-fast disconnector is explored in depth using analytical model and 5 kV, 4-break hardware prototype. The experimental testing demonstrates that the arc voltage increases proportionally with each breaking point, and this increases current that can be internally commutated. Further analysis of the impact of delays between break points is presented. Modeling and testing with 4 different capacitors of 1-10 kV concludes that larger capacitances increase commutating current, but relationship is complex and non-linear. Parallel connection of breaking points is also analysed. Successful breaking of DC fault current is demonstrated on hardware for multiple cases including 930 A with 800 µF, 6.5 kV, capacitor using a 4break disconnector. The tested DC CB is of mechanical type, which inserts a capacitor in series in a very short time of around 290 µs, and full contact separation is achieved 1.5 ms after the trip signal. It is recommended that the module design should primarily consider maximizing the number of break points in series.

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An Arc Study at High DC Current Levels in Automotive Applications

Cited by 15 publications

References 9 publications

Multibreak LC DC Circuit Breaker

Multibreak LC DC Circuit Breaker

LC DC Circuit Breaker based on Pre-charged Capacitor Commutation

Development and Experimental Evaluation of 2 -10 Kv LC DC Circuit Breaker Module

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