By M. S. Naidu
Excessive voltage engineering ideas and methods at your fingertips. Now there is an authoritative software that offers you fast entry to the state of the art in nearly each region of excessive voltage engineering. excessive Voltage Engineering, moment variation, by means of M. S. Naidu and V. Kamaraju, has been good, liquid, and gasoline insulating fabrics and their functions and breakdown phenomena--generation and size of excessive AC, DC, and impulse voltages and currents--overvoltages prompted through lightning, switching surges, glitches, and different phenomena--high-voltage checking out suggestions plus checking out of equipment and equipment--and making plans of excessive voltage laboratories. you will additionally locate new information on vacuum insulation, the breakdown of composite insulation/insulation platforms, excessive voltage and extra-high voltage AC strength transmission, and lots more and plenty extra.
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Example text
The breakdown characteristics of rod-rod gaps are shown n Fig. 20. From this figure it can be seen that the breakdown voltages are higher for negative polarity. The breakdown voltages were also observed to depend on humidity in air. In the case of rod gaps the field is non-uniform, while in the case of sphere gaps field is uniform, if the gap is small compared with the diameter. In the case of sphere gaps, the breakdown voltages do not depend on humidity and are also independent of the voltage waveform.
Making use of Fig. 14 suggest the suitable gap distance and pressure in glow discharge tube when the gas in it is (a) hydrogen, (b)tir. 5 torr-cm (see Fig. 14). Since the usual gap distance used for glow discharge tubes of smaller sizes is about 3 mm, the gas pressure used in case of hydrogen will be or, § = 25 torr 45 and in the case of air it will be -^ =15 torr. 3 : What will the breakdown strength of air be for small gaps (1 mm) and large gaps (20 cm) under uniform field conditions and standard atmospheric conditions?
I This is the usually quoted breakdown strength of air at room temperature and at atmospheric pressure. 1 Corona Discharges If the electric field is uniform, a gradual increase in voltage across a gap produces a breakdown of the gap in the form of a spark without any preliminary discharges. On the other hand, if the field is non-uniform, an increase in voltage will first cause a discharge in the gas to appear at points with highest electric field intensity, namely at sharp points or where the electrodes are curved or on transmission lines.