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Mass-spectroscopic study of the influence of nozzle material on high-pressure SF6 arcs

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Abstract

The interrupting capability of a gas-blast high-voltage circuit breaker (CB) is mainly determined by the self-induced pressure rise caused by the thermal arc energy, the composition of the arc plasma and the chemical reactions occuring during and after current interruption. We have studied the nozzle materials boron nitride (BN), quartz (SiO2), polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene (ETFE), polyethylene (PE) and epoxy resin (ER) with respect to their influence on these processes with the aid of a model circuit breaker (MCB). Direct measurements of the arc-induced pressure rise reveal that the portion of the arc energy available for the pressure rise varies greatly (∼20%–65%) with the properties of the nozzle material. Nozzle erosion is significantly higher for materials with high values (e.g. polymers). Therefore, the lifetime of polymer nozzles is considerably shorter than that of ceramic nozzles. We have investigated the influence of the nozzle material on the decomposition products formed in the arc discharge of our MCB by studying the composition and time dependence of these products. The MCB was directly attached to the time-of-flight mass spectrometer (TOFMS) with the aid of a molecular-beam sampling system, which allowed real-time measurements of the arced gas during and after current interruption, thus providing information on the ablation mechanism and on the reaction kinetics of vaporised nozzle material with dissociated SF6. The most abundant long-lived reaction products are SF4, SOF2, C2H2, CO, and CS2. Their formation rates have been determined as functions of the nozzle material. With respect to quantities and properties of decomposition products, ceramics are superior to polymers since they form only small concentrations of corrosive and toxic products.

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Author notes

  1. H. J. Schötzau

    Present address: AEW, CH-5000, Aarau, Switzerland

Authors and Affiliations

  1. Institute of Quantum Electronics, ETH, CH-8093, Zürich, Switzerland

    R. Meier & F. K. Kneubühl

  2. Sprecher Energie AG, CH-5036, Oberentfelden, Switzerland

    H. J. Schötzau

Authors
  1. R. Meier
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  2. F. K. Kneubühl
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  3. H. J. Schötzau
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Meier, R., Kneubühl, F.K. & Schötzau, H.J. Mass-spectroscopic study of the influence of nozzle material on high-pressure SF6 arcs. Appl. Phys. B 48, 187–211 (1989). https://doi.org/10.1007/BF00694346

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