Modeling of the dielectric recovery of hot air in insulating nozzles

Kurz, Andreas; Nikolic, Paul Gregor; Seeger, Martin; Eichhoff, Daniel; Schnettler, Armin

doi:10.1109/ipmhvc.2012.6518758

Cited by 3 publications

(2 citation statements)

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“…The experiments show that the peak value of the recovery voltage is the most important factor for the outcome of the interruption, and that the rate of rise of recovery voltage is of less importance. This makes sense when considering the findings by Seeger et al [17] and Kurz et al [18] that the withstand voltage increases rapidly to a certain level, then stays at that level for some time before rising again. In [20], no interruptions were successful when the source voltage was raised to 13,9 kV.…”

Section: The Dielectric Recovery In Ablation Gassesmentioning

confidence: 99%

“…The influence of nozzle ablation on the dielectric properties after current zero is an important topic in high voltage circuit breaker design, even though ablation is not used actively for arc quenching in these breakers. Seeger et al [17] and Kurz et al [18] argue that, in a gas blast circuit breaker, the ablation gas inside the nozzle significantly inhibits the dielectric recovery. Initially, they observe a fast increase in dielectric strength for some 100 µs after current zero, after that the withstand strength stay at a stable level for about 1 ms before it starts to increase again.…”

Section: The Dielectric Recovery In Ablation Gassesmentioning

confidence: 99%

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Ablation-assisted current interruption in medium voltage switchgear – Development and prospect

Taxt¹

2017

NORD-IS

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SF 6 -gas is widely used in medium and high voltage switchgear today because of its excellent insulation and current interruption capabilities. However, due to its high global warming potential, there is a political pressure to replace it wherever possible, resulting in a need for new solutions in the design of compact lowcost switchgear. An evident response is to review and further develop the technologies that were promising before the entry of SF 6 . One of these was the application of gas-emitting insulation materials, in a process of ablation. This paper reviews the range of commercial breaker designs that have taken advantage of ablation in the interruption process from the 1930s until today. The main designs and developments are outlined and some important parameters are explained, such as the steady state ablation-dominated arc, arc quenching and dielectric recovery in the presence of ablation material. The ratings of the mentioned products, as well as more recent experiments, indicate that there is a design limit for simple ablation-assisted breakers at around 20 kV, but the reasons for the apparent limit are not thoroughly studied or explained. Reviving the knowledge of ablation breakers, and combining this with new knowledge and new tools could prove valuable to the development of SF 6 -free MV switchgear.

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Section: The Dielectric Recovery In Ablation Gassesmentioning

confidence: 99%

Section: The Dielectric Recovery In Ablation Gassesmentioning

confidence: 99%