New PDF release: An Introduction to High-Voltage Experimental Technique:
By Dieter Kind
High-voltage expertise is a box of electric engineering the clinical rules of that are basically present in Physics and which, by means of its program, is in detail associated with commercial perform. it truly is fascinated by the actual phenomena and technical difficulties linked to excessive voltages. The homes of gases and plasmas, in addition to liquid and good insulating fabrics, are of primary value to high-voltage know-how. besides the fact that, regardless of all growth, the actual phenomena saw in those media can purely be incompletely defined through theoretical therapy, and so test constitutes the foreground of medical study during this box. instructing and examine in high-voltage expertise hence count almost always upon experimental strategies whilst facing difficulties. acceptance of this truth is the conceptual foundation for the current booklet. it truly is 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 try out has been made right here to point very important useful difficulties of checking out stations and laboratories, and to signify options. The ebook may still as a result additionally turn out to be a aid to the paintings of the training engineer. The theoretical issues are correlated with the experiments of a high-voltage functional direction, that are defined in nice element. The remedy assumes as a lot familiarity with the topic as could be anticipated from third 12 months scholars of electric engineering.
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Additional resources for An Introduction to High-Voltage Experimental Technique: Textbook for Electrical Engineers
In the above explanation of the operating mode of the circuits, it was assumed that at t = 0 the impulse capacitors Cs were charged to a voltage Vo. Vo is the value of the charging voltage at which F breaks down, either by itself or by means of an auxiliary discharge. Thus, for self-triggered operation, an increase in the peak value of the impulse voltage U can only be achieved by increasing the spacing of F. Merely increasing the direct voltage applied in front of the charging resistor would only result in Cs charging up faster to the value Vo, and F breaking down spontaneously in shorter intervals of time.
The peak value of impulse voltages can be determined with the aid of measuring gaps, or better, be measured by electronic circuits combined with voltage dividers. The most important measuring device for impulse voltages is, however, the cathode-ray oscilloscope, which allows the complete time characteristic of the voltage to be determined by means of voltage dividers; occasionally analog digital converter equipment may be used instead of the oscilloscope. 1 Characteristic Parameters of Impulse Voltages In high-voltage technology a single, unipolar voltage pulse is termed an impulse voltage; three important examples are shown in Fig.
2·4 Villard circuit a) Circuit diagram b) Voltage curve T ult), R;oo R t_ a) b) Fig. 2-5 Greinacher doubler-circuit a) Circuit diagram b) Voltage curve Villard Circuit: This circuit, shown in Fig. 2-4, is the simplest doubling circuit. The blocking capacitor C is charged to the peak value UT and thus increases the potential of the high-voltage output terminal with respect to the transformer voltage by this amount. For no-load conditions, we have: D =UT ; U=2 UT ; Uy =2 UT . Smoothing of the output voltage u(t) is not possible.
An Introduction to High-Voltage Experimental Technique: Textbook for Electrical Engineers by Dieter Kind