A high-current rail-type gas switch with preionization by an additional corona discharge


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Abstract

The characteristics of a high-current rail-type gas switch with preionization of the gas (air) in a spark gap by an additional corona discharge are investigated. The experiments were performed in a voltage range of 10–45 kV using a two-electrode switch consisting of two cylindrical electrodes with a diameter of 22 mm and a length of 100 mm and a set of laterally located corona-discharge needles. The requirements for the position and size of the needles are defined for which a corona discharge is ignited before a breakdown of the main gap and does not change to a sparking form, and the entire length of the rail electrodes is efficiently used. The fulfillment of these requirements ensures stable operation of the switch with a small variation of the pulse breakdown voltage, which is not more than 1% for a fixed voltage-pulse rise time in the range from 150 ns to 3.5 μs. A short delay time of the switch breakdown makes it possible to control the two-electrode switch by an overvoltage pulse of nanosecond duration.

About the authors

E. I. Antipov

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: ekrastelev@yandex.ru
Russian Federation, Kashirskoe sh. 31, Moscow, 115409

O. S. Belozerov

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: ekrastelev@yandex.ru
Russian Federation, Kashirskoe sh. 31, Moscow, 115409

E. G. Krastelev

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute); Joint Institute for High Temperatures

Author for correspondence.
Email: ekrastelev@yandex.ru
Russian Federation, Kashirskoe sh. 31, Moscow, 115409; ul. Izhorskaya 13, str. 2, Moscow, 125412

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