A.V. Vasin¹, Ja.V. Dominjuk², B.A. Levitan³, R.A. Makarov4

1−3 PJSC «Radiofizika» (Moscow, Russia)

3 Moscow Institute of Physics and Technology (National Research University) (Dolgoprudny, Russia)

3 Moscow Aviation Institute (National Research University) (Moscow, Russia)

4 216 Military Representative Office of the Ministry of Defense of the Russian Federation (Moscow, Russia)

Power distribution equipment for modern high-powered complex radio-frequency facilities is required to provide radio-frequency hardware units and modules with protection against the influence of microsecond-pulse overvoltage surges of high energy. The surge protection of the radio-frequency hardware is implemented with surge protective devices based on zinc oxide varistors.

The article describes a two-stage protection circuit based on two varistors connected in parallel and splitted apart with a conforming inductor and a three-stage protection circuit base on three varistors connected in parallel and splitted apart with two conforming inductors, the most important magnitude of both circuits being the magnitude of the residual voltage on the protected hardware during the influence of surge overvoltage at 20 kA amplitude current pulse of 10/350 µs and 8/350 µs shapes.

The article presents protected hardware residual voltage calculation formulae for the two-stage protection circuit. A calculation example for real varistors with specified parameters based on the presented formulae is provided.

The designed simplified calculation method allows the evaluation of surge protection efficiency at the start of power supply system design.

Vasin A.V., Dominjuk Ja.V., Levitan B.A., Makarov R.A. Radio-frequency hardware protection against microsecond-pulse overvoltage.  Radiotekhnika. 2021. V. 85. № 4. P. 45−58. DOI: https://doi.org/10.18127/j00338486-202104-06 (In Russian)

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