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Surface discharge switch design: the critical factor

Surface discharge switch design: the critical factor,10.1109/MODSYM.1990.201000,T. G. Engel,M. Kristiansen,M. Baker,L. L. Hatfield

Surface discharge switch design: the critical factor   (Citations: 1)
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The authors report which dielectric properties are critical to designing a long-life surface discharge switch (SDS). Theory is correlated with experiment by evaluating the performance of a large group of polymeric and ceramic dielectrics. These dielectrics were tested in a single-channel, self-commutating SDS operating at ~35 kV and ~ 300 kA (oscillatory discharge) with a pulse length of ~20 μs (1/4 period ~2 μs). The performance of a dielectric is characterized by its shot-to-shot breakdown voltage and by its mass erosion. Theoretically, the voltage holdoff degradation resistance and the arc melting/erosion resistance of a dielectric can be qualitatively predicted from its `formativity' and its `impulsivity', respectively. The formativity and impulsivity are figures of merit calculated from the known thermophysical properties of the dielectric. The effects produced in dielectric performance by choice of electrode material (e.g., molybdenum, graphite, and copper-tungsten) and discharge repetition rate are also discussed
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    • ...Engel et al. [26] developed a relationship that could be used for ceramic, polymeric, or elastomeric materials...
    • ...The pure nitrogen tests show that oxygen in the ambient atmosphere is seen to increase the lifetime of the Gseries polymers by reacting with any decomposition-produced carbon to form a stable gas as opposed to remaining on the insulator surface [26]...

    Thomas G. Engelet al. Mechanisms and Predictors of Insulator Degradation and Erosion Produce...

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