Abnormal polarity effect in nanosecond-pulse breakdown of SF6 and nitrogen |
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Institution: | 1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. Key Laboratory of Power Electronics and Electric Drive, Chinese Academy of Sciences, Beijing 100190, China;3. Institute of High Current Electronics, Russian Academy of Sciences, Tomsk 634055, Russia;4. Tomsk State University, Tomsk 634050, Russia |
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Abstract: | The breakdown of gas gaps in an inhomogeneous electric field at subnanosecond and nanosecond voltage pulse rise times are studied, and the famous polarity effect in point-to-plane gaps is investigated. It is shown that at a voltage pulse rise time of ∼0.5 ns, the inversion of polarity effect takes place not only in electronegative gases such as SF6, but also occurs in electropositive nitrogen. The inversion of polarity effect is related to a delay of electron emission from the plane cathode on arrival of the ionization wave front anode to the cathode. It is found that with a voltage pulse rise time of ∼0.5 ns, the inversion of polarity effect occurs at SF6 and SF6–N2 pressures of 0.25 MPa and lower, and with a voltage pulse rise time of 15 ns, at a SF6 pressure lower than 0.12 MPa. |
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Keywords: | Gas discharge Nanosecond pulse Polarity effect Inversion of polarity effect Nitrogen |
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