By Dieter Kind
High-voltage know-how is a box of electric engineering the clinical ideas of that are basically present in Physics and which, by way of its software, is in detail associated with commercial perform. it truly is eager about the actual phenomena and technical difficulties linked to excessive voltages. The houses of gases and plasmas, in addition to liquid and sturdy insulating fabrics, are of primary importance to high-voltage know-how. although, regardless of all development, the actual phenomena saw in those media can simply be incompletely defined through theoretical therapy, and so scan constitutes the foreground of clinical examine during this box. educating and learn in high-voltage know-how hence depend more often than not upon experimental thoughts whilst facing difficulties. attractiveness of this truth is the conceptual foundation for the current publication. it's basically meant for college students of electric engineering and goals to supply the reader with an important instruments for the experimental method of difficulties in high-voltage know-how. An test has been made right here to point very important sensible difficulties of trying out stations and laboratories, and to signify recommendations. The e-book should still accordingly additionally end up to be a aid to the paintings of the training engineer. The theoretical issues are correlated with the experiments of a high-voltage useful direction, that are defined in nice aspect. The remedy assumes as a lot familiarity with the topic as will be anticipated from third 12 months scholars of electric engineering.
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Extra resources for An Introduction to High-Voltage Experimental Technique: Textbook for Electrical Engineers (German Edition)
However, the capacitance of the measuring cable CK can usually be neglected compared with C2 • Whilst the earth capacitance of capacitive dividers can be taken into account by a correction of the divider ratio, the response behaviour here is essentially determined by the inductance of the divider lead. As a first step, in the equivalent circuit of Fig. 3-l0b an inductance L has been assumed in series with C 1. Using the relationships given in a), we obtain for this circuit: w(t) = 1- coswt, with For capacitive dividers an additional damping resistance is usually connected in the lead on the high-voltage side.
In this kind of discharge circuit the impulse current is critically influenced by the test object. e. when R~2y:g. In this case, with the capacitor charged to a voltage Uo, we have for the peak value of the discharge current: i~UoVf=~· The maximum rate of rise of the current at t = 0 is: Uo ( di) dt max ~L . i Uc b) a) Fig. 4·2 Impulse current circuit with capacitive energy storage a) Equivalent circuit b) Current curves _ ----'R=O ---with KS R="Vf R=2-¥t 48 1 Fundamental Principles of High·Voltage Experimental Techniques To increase the value of i, and for maximum rate of rise of the current, one therefore tries to keep L low.
An insulated belt is run over rollers and electrostatically charged by an excitation arrangement. A strongly inhomogeneous electrode configuration is used for this purpose; charge carriers formed by collision ionisation at the sharp electrode are trapped by the belt on their way to the opposite electrode. A similar arrangement at the high-voltage end serves to discharge the belt. If another excitation arrangement of the opposite polarity is provided at the high-voltage level for the downwards moving side of the belt, twice the amount of current is obtained.