By Dieter Kind
High-voltage expertise is a box of electric engineering the medical ideas of that are primarily present in Physics and which, by way of its program, is in detail associated with business perform. it truly is all in favour of the actual phenomena and technical difficulties linked to excessive voltages. The houses of gases and plasmas, in addition to liquid and reliable insulating fabrics, are of basic importance to high-voltage know-how. despite the fact that, regardless of all growth, the actual phenomena saw in those media can simply be incompletely defined through theoretical therapy, and so scan constitutes the foreground of clinical study during this box. instructing and learn in high-voltage know-how hence depend regularly upon experimental recommendations while facing difficulties. popularity of this truth is the conceptual foundation for the current booklet. it truly is essentially meant for college kids 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 the following to point very important sensible difficulties of trying out stations and laboratories, and to signify options. The booklet should still for this reason additionally turn out to be a support to the paintings of the practicing engineer. The theoretical concerns are correlated with the experiments of a high-voltage useful direction, that are defined in nice aspect. The therapy assumes as a lot familiarity with the topic as can be anticipated from third yr scholars of electric engineering.
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Additional info for An Introduction to High-Voltage Experimental Technique: Textbook for Electrical Engineers
2-6 Zimmermann-Wittka circuit (no-load condition) t-- b) a) Circuit diagram b) Voltage curve Fig. 2-7 Greinacher cascade circuit (no-load condition) Greinacher Cascade Circuit: This circuit, suggested in 1920 by H Greinacher and which is also known as the Cockroft-Walton multiplier, is the most important method for the generation of very high direct voltages. It is an extension of the Greinacher doublercircuit. A three-stage circuit is shown in Fig. 2-7 as an example; many practical circuits comprise only the parts shown in bold lines.
Fig. 3-6b shows examples of possible high-voltage impulses. The time dependence of the curve up to the peak value Utakes the form (1- coswt), which can be described by the equivalent circuit of a series resonant circuit for this experimental setup. Here the transformer is replaced by its leakage inductance Ls, the high-voltage side capacitances are represented by C. Assuming a stable voltage source in 34 Fundamental Principles of High-Voltage Experimental Techniques .... \ , , t- \ \ b) Fig. 3-6 Generation of switching impulse voltages using testing transformers a) Basic circuit diagram for mains and capacitor excitation b) Voltage curves for various switching devices 1 - thyristor 2 - mechanical switch \ \ ,-- ..
3 Generation and Measurement of Impulse Voltages / I peak o ta) tb) c) Fig. 3-1 Examples of impulse voltages a) Rectangular impulse voltage b) Wedge-shaped impulse voltage c) Double exponential impulse voltage tional or unintentional breakdown occurs in the high-voltage circuit during the impulse, leading to a sudden collapse of the voltage, this is then called a chopped impulse voltage. The chopping can occur on the front, at the peak or in the tail section of the impulse voltage. The transient phenomenon thereby induced is mainly responsible for the oscillations indicated in Fig.