By Vasily Y. Ushakov, V. F. Klimkin, S. M. Korobeynikov
The ebook describes the most actual strategies and phenomena in pulsed electrical breakdown. the data and the keep an eye on of the electrical breakdown of beverages is critical not just for the insulation within energy platforms however it is additionally used for the construction and knowledge of excessive voltage and excessive present pulses. Such high-voltage micro- and nanosecond pulses locate broad program in experimental physics, electro discharge expertise, physics of dielectrics, radar detection and varying, high-speed images.
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Extra resources for Impulse Breakdown of Liquids (Power Systems)
2 Motion of charge carriers Electrohydrodynamic processes The mobility of charge carriers in strong electric ﬁelds is determined by liquid motion. In this case, mobility values of diﬀerent ions are close to each other since ions have been frozen into the liquid and are transferred by liquid microﬂows. These considerations and theoretical estimates of the conditions of forming electrohydrodynamic (EHD) ﬂows were presented in [45, 46]. The occurrence of EHD ﬂows is directly related to space charges generated in the liquid.
It is obvious that the wave character of the process will be kept unchanged in strong electric ﬁelds when the acoustic approximation is inapplicable and the ε value will decrease in the region of maximum ﬁeld. We note that the last circumstance must cause the ﬁeld in this region to increase, thereby leading to further decrease in ε, ﬁeld ampliﬁcation, and so on. The increase in the ﬁeld strength does not lead to the electrostatic catastrophe, and the ﬁeld remains bounded due to a ﬁnite electrode potential.
Moreover, ﬂows are formed on the pulse front, that is, for exposure periods of about 1 μs. From here we conclude that charge carriers are transferred by microﬂows which are formed for time periods less than 1 μs. The motion of charge carriers was registered with an ultrahigh speed photoregister in the slit scanning regime. The motion of charge carriers emitted near the electrode resulted in a redistribution of the ﬁeld strength registered with the help of the Kerr eﬀect technique. 3 High-Voltage Electric Conduction of Liquids 23 Fig.